Constrained RESTful Environments (CoRE) Parameters

Created

2012-06-08

Last Updated

2026-08-11

Available Formats

Resource Type (rt=) Link Target Attribute Values

Expert(s)

Carsten Bormann, Jaime Jimenez, Christian Amsüss

Reference

RFC 6690: Constrained RESTful Environments (CoRE) Link Format

Note

Registration requests should be sent to the mailing list described in RFC 6690. If approved, designated experts should notify IANA within two weeks. For assistance, please contact iana@iana.org. IANA does not monitor the list.

Available Formats

Range	Registration Procedures
value starts with "core"	IETF Review
all other values	Specification Required

Value	Description	Reference
core.gp	Group Configuration resource. This resource is used to query/manage the group membership of a CoAP server.	RFC 7390, Section 2.6.2
core.hc	HTTP-to-CoAP mapping base resource.	RFC 8075, Section 5.5
core.rd	Directory resource of an RD	RFC 9176, Section 4.3
core.rd-ep	Endpoint resource of an RD	RFC 9176, Section 6
core.rd-lookup-ep	Endpoint lookup of an RD	RFC 9176, Section 4.3
core.rd-lookup-res	Resource lookup of an RD	RFC 9176, Section 4.3
oic.d.airconditioner	Air Conditioner device	OIC_SmartHomeDevice_Specification_v1.1.0 section 10.1
oic.d.airpurifier	Air Purifier device	OIC_SmartHomeDevice_Specification_v1.1.0 section 10.1
oic.d.blind	Blind device	OIC_SmartHomeDevice_Specification_v1.1.0 section 10.1
oic.d.camera	Camera device	OIC_SmartHomeDevice_Specification_v1.1.0 section 10.1
oic.d.dishwasher	Dishwasher device	OIC_SmartHomeDevice_Specification_v1.1.0 section 10.1
oic.d.door	Door device	OIC_SmartHomeDevice_Specification_v1.1.0 section 10.1
oic.d.dryer	Dryer device	OIC_SmartHomeDevice_Specification_v1.1.0 section 10.1
oic.d.fan	Fan device	OIC_SmartHomeDevice_Specification_v1.1.0 section 10.1
oic.d.garagedoor	Garage Door device	OIC_SmartHomeDevice_Specification_v1.1.0 section 10.1
oic.d.light	Light device	OIC_SmartHomeDevice_Specification_v1.1.0 section 10.1
oic.d.multifunctionprinter	Printer Multi-Function device	OIC_SmartHomeDevice_Specification_v1.1.0 section 10.1
oic.d.oven	Oven device	OIC_SmartHomeDevice_Specification_v1.1.0 section 10.1
oic.d.printer	Printer device	OIC_SmartHomeDevice_Specification_v1.1.0 section 10.1
oic.d.receiver	Receiver device	OIC_SmartHomeDevice_Specification_v1.1.0 section 10.1
oic.d.refrigerator	Refrigerator device	OIC_SmartHomeDevice_Specification_v1.1.0 section 10.1
oic.d.robotcleaner	Robot Cleaner device	OIC_SmartHomeDevice_Specification_v1.1.0 section 10.1
oic.d.scanner	Scanner device	OIC_SmartHomeDevice_Specification_v1.1.0 section 10.1
oic.d.securitypanel	Security Panel device	OIC_SmartHomeDevice_Specification_v1.1.0 section 10.1
oic.d.sensor	Generic Sensor device	OIC_SmartHomeDevice_Specification_v1.1.0 section 10.1
oic.d.smartlock	Smart Lock device	OIC_SmartHomeDevice_Specification_v1.1.0 section 10.1
oic.d.smartplug	Smart Plug device	OIC_SmartHomeDevice_Specification_v1.1.0 section 10.1
oic.d.switch	Switch device	OIC_SmartHomeDevice_Specification_v1.1.0 section 10.1
oic.d.thermostat	Thermostat device	OIC_SmartHomeDevice_Specification_v1.1.0 section 10.1
oic.d.tv	Television device	OIC_SmartHomeDevice_Specification_v1.1.0 section 10.1
oic.d.washer	Washer device. This is a clothes washer device.	OIC_SmartHomeDevice_Specification_v1.1.0 section 10.1
oic.d.watervalve	Water Valve device	OIC_SmartHomeDevice_Specification_v1.1.0 section 10.1
oic.r.airflow	Air Flow resource. This resource describes the properties associated with air flow.	OIC_Resource_Type_Specification_v1.1.0 section 6.1
oic.r.airflowcontrol	Air Flow Control resource. This resource describes the attributes associated with control of air flow, for example as modelled by a Thermostat (fan), Room A/C or other device.	OIC_Resource_Type_Specification_v1.1.0 section 6.2
oic.r.altimeter	Altimeter resource. This resource describes properties associated with the height of the position.	OIC_Resource_Type_Specification_v1.1.0 section 6.58
oic.r.audio	Audio Controls resource. This resource defines basic audio control functions.	OIC_Resource_Type_Specification_v1.1.0 section 6.25
oic.r.autofocus	Auto Focus resource. This resource describes whether an auto focus feature is on or off.	OIC_Resource_Type_Specification_v1.1.0 section 6.26
oic.r.automaticdocumentfeeder	Automatic Document Feeder resource. This resource describes the state of an automatic document feeder, typically used with a scanner.	OIC_Resource_Type_Specification_v1.1.0 section 6.27
oic.r.button	Button Switch resource. This resource describes the operation of a button style switch.	OIC_Resource_Type_Specification_v1.1.0 section 6.28
oic.r.clock	Clock resource. This resource describes the properties associated with clock and time.	OIC_Resource_Type_Specification_v1.1.0 section 6.59
oic.r.colour.autowhitebalance	Auto White Balance resource. This resource describes whether an auto balance feature is on or off.	OIC_Resource_Type_Specification_v1.1.0 section 6.31
oic.r.colour.chroma	Colour Chroma resource. This resource describes the colour using chroma conventions.	OIC_Resource_Type_Specification_v1.1.0 section 6.6
oic.r.colour.rgb	Colour RGB resource. This resource specifies the actual colour in the RGB space.	OIC_Resource_Type_Specification_v1.1.0 section 6.7
oic.r.colour.saturation	Colour Saturation resource. This resource describes a Colour saturation value.	OIC_Resource_Type_Specification_v1.1.0 section 6.32
oic.r.door	Door resource. This resource describes the open state of a door.	OIC_Resource_Type_Specification_v1.1.0 section 6.9
oic.r.energy.battery	Battery resource. This resource represents the charge state of a battery.	OIC_Resource_Type_Specification_v1.1.0 section 6.3
oic.r.energy.consumption	Energy Consumption resource. This resource describes the energy consumed by the device since power up and the instantaneous power draw of the device at the time the resource was queried.	OIC_Resource_Type_Specification_v1.1.0 section 6.10
oic.r.energy.drlc	Demand Response Load Control (DRLC) resource. This resource describes any to be applied or currently being applied DRLC signal.	OIC_Resource_Type_Specification_v1.1.0 section 6.34
oic.r.energy.overload	Energy Overload/Circuit Breaker resource. This resource describes whether an energy overload detector/circuit breaker has been tripped.	OIC_Resource_Type_Specification_v1.1.0 section 6.35
oic.r.energy.usage	Energy Usage resource. This resource describes a cumulative time-based energy usage query.	OIC_Resource_Type_Specification_v1.1.0 section 6.11
oic.r.height	Height resource. This resource describes the properties associated with height of an object's physical size.	OIC_Resource_Type_Specification_v1.1.0 section 6.61
oic.r.humidity	Humidity resource. This resource describes a sensed or desired humidity.	OIC_Resource_Type_Specification_v1.1.0 section 6.12
oic.r.icemaker	Ice Maker resource. This resource describes the operational state of an ice maker.	OIC_Resource_Type_Specification_v1.1.0 section 6.13
oic.r.light.brightness	Brightness resource. This resource describes the brightness of a light or lamp.	OIC_Resource_Type_Specification_v1.1.0 section 6.5
oic.r.light.dimming	Dimming resource. This resource describes a dimming function.	OIC_Resource_Type_Specification_v1.1.0 section 6.8
oic.r.light.ramptime	Ramp Time resource. This resource describes the Ramp Time of a dimming function.	OIC_Resource_Type_Specification_v1.1.0 section 6.19
oic.r.lock.code	Lock Code resource. This resource describes a lock code.	OIC_Resource_Type_Specification_v1.1.0 section 6.15
oic.r.lock.status	Lock resource. This resource describes whether a lock is locked or unlocked.	OIC_Resource_Type_Specification_v1.1.0 section 6.14
oic.r.media	Media resource. This resource specifies the media that a server supports.	OIC_Resource_Type_Specification_v1.1.0 section 6.41
oic.r.media.input	Media Source Input resource. This resource provides the list of input media sources available on the device.	OIC_Resource_Type_Specification_v1.1.0 section 6.42
oic.r.media.output	Media Source Output resource. This resource provides the list of output media sources available on the device.	OIC_Resource_Type_Specification_v1.1.0 section 6.43
oic.r.mode	Mode resource. This resource describes the modes of operation that a device can provide.	OIC_Resource_Type_Specification_v1.1.0 section 6.16
oic.r.movement.linear	Movement resource. This resource describes linear movement.	OIC_Resource_Type_Specification_v1.1.0 section 6.54
oic.r.nightmode	Night Mode resource. This resource describes whether a night mode feature is on or off.	OIC_Resource_Type_Specification_v1.1.0 section 6.45
oic.r.openlevel	Open Level resource. This resource describes how open or ajar an entity such as a window, door, blind or shutter is.	OIC_Resource_Type_Specification_v1.1.0 section 6.17
oic.r.operational.state	Operational State resource. This resource describes the operational and job states on a device.	OIC_Resource_Type_Specification_v1.1.0 section 6.18
oic.r.ptz	Pan Tilt Zoom Movement resource. This resource specifies the pan tilt and zoom capabilities of a device.	OIC_Resource_Type_Specification_v1.1.0 section 6.47
oic.r.refrigeration	Refrigeration resource. This resource describes a refrigeration function.	OIC_Resource_Type_Specification_v1.1.0 section 6.20
oic.r.sensor	Generic Sensor resource. This resource describes whether some value or property or entity has been sensed or not.	OIC_Resource_Type_Specification_v1.1.0 section 6.36
oic.r.sensor.acceleration	Acceleration Sensor resource. This resource provides a measure of proper acceleration (g force).	OIC_Resource_Type_Specification_v1.1.0 section 6.53
oic.r.sensor.activity.count	Activity Count resource. This resource specifies an activity count.	OIC_Resource_Type_Specification_v1.1.0 section 6.23
oic.r.sensor.atmosphericpressure	Atmospheric Pressure resource. This resource provides a measurement of Mean Sea Level Pressure experienced at the measuring point expressed in millibars.	OIC_Resource_Type_Specification_v1.1.0 section 6.24
oic.r.sensor.carbondioxide	Carbon Dioxide Sensor resource. This resource describes whether carbon dioxide has been sensed or not.	OIC_Resource_Type_Specification_v1.1.0 section 6.29
oic.r.sensor.carbonmonoxide	Carbon Monoxide Sensor resource. This resource describes whether carbon monoxide has been sensed or not.	OIC_Resource_Type_Specification_v1.1.0 section 6.30
oic.r.sensor.contact	Contact Sensor resource. This resource describes whether a contact sensor has been tripped or not.	OIC_Resource_Type_Specification_v1.1.0 section 6.33
oic.r.sensor.geolocation	Geolocation Sensor resource. This resource describes the properties associated with the current geolocation coordinate.	OIC_Resource_Type_Specification_v1.1.0 section 6.60
oic.r.sensor.glassbreak	Glass Break Sensor resource. This resource describes a glass break sensor.	OIC_Resource_Type_Specification_v1.1.0 section 6.37
oic.r.sensor.heart.zone	Heart Rate Zone Sensor resource. This resource describes a measured heart rate by the current Zone using the Zoladz method.	OIC_Resource_Type_Specification_v1.1.0 section 6.38
oic.r.sensor.illuminance	Illuminance Sensor resource. This resource describes an illuminance sensor.	OIC_Resource_Type_Specification_v1.1.0 section 6.39
oic.r.sensor.magneticfielddirection	Magnetic Field Direction resource. This resource describes the direction of the Earth's magnetic field at the observer's current point in space.	OIC_Resource_Type_Specification_v1.1.0 section 6.40
oic.r.sensor.motion	Motion Sensor resource. This resource describes whether motion has been sensed or not.	OIC_Resource_Type_Specification_v1.1.0 section 6.43
oic.r.sensor.presence	Presence Sensor resource. This resource describes whether presence has been sensed or not.	OIC_Resource_Type_Specification_v1.1.0 section 6.45
oic.r.sensor.radiation.uv	UV Radiation resource. This resource describes an ultraviolet radiation measurement.	OIC_Resource_Type_Specification_v1.1.0 section 6.51
oic.r.sensor.sleep	Sleep Sensor resource. This resource describes whether human sleep has been sensed or not.	OIC_Resource_Type_Specification_v1.1.0 section 6.55
oic.r.sensor.smoke	Smoke Sensor resource. This resource describes whether smoke has been sensed or not.	OIC_Resource_Type_Specification_v1.1.0 section 6.56
oic.r.sensor.threeaxis	Three Axis Sensor resource. This resource provides a representation of the measurement from a three-axis sensor.	OIC_Resource_Type_Specification_v1.1.0 section 6.57
oic.r.sensor.touch	Touch Sensor resource. This resource describes whether touch has been sensed or not.	OIC_Resource_Type_Specification_v1.1.0 section 6.50
oic.r.sensor.water	Water Sensor resource. This resource describes whether water has been sensed or not.	OIC_Resource_Type_Specification_v1.1.0 section 6.52
oic.r.signalstrength	Signal Strength resource. This resource describes the strength of a signal by means of Link Quality Indicator and Received Signal Strength Indicator.	OIC_Resource_Type_Specification_v1.1.0 section 6.48
oic.r.speech.tts	Speech Synthesis resource. This resource is capable of rendering speech and allows a client to provide an SSML document with text to render.	OIC_Resource_Type_Specification_v1.1.0 section 6.49
oic.r.switch.binary	Binary switch resource. This resource describes a binary switch (on/off).	OIC_Resource_Type_Specification_v1.1.0 section 6.4
oic.r.temperature	Temperature resource. This resource describes a sensed or actuated Temperature value.	OIC_Resource_Type_Specification_v1.1.0 section 6.21
oic.r.time.period	Time Period resource. This resource describes the time period over which any additionally provided information is derived or bounded.	OIC_Resource_Type_Specification_v1.1.0 section 6.22
oic.r.weight	Weight resource. This resource describes the properties associated with weight of an object.	OIC_Resource_Type_Specification_v1.1.0 section 6.62
oma.lwm2m	OMA LwM2M Resource. This Resource type indicates that the resource and all of its sub-resources support the OMA Lightweight M2M protocol, i.e. contain OMA LwM2M objects and resources.	OMA-TS-LightweightM2M-V1_0
bbf.usp.endpoint	Endpoint of the Broadband Forum USP protocol	https://usp.technology/specification/mtp/coap/
oic.wk.col	Collection resource.	OCF_Core_Specification_v1.0.0 section D.2
oic.wk.con	Device Configuration resource.	OCF_Core_Specification_v1.0.0 section D.3
oic.wk.con.p	Platform Configuration resource.	OCF_Core_Specification_v1.0.0 section D.4
oic.wk.d	Device resource.	OCF_Core_Specification_v1.0.0 section D.5
oic.wk.mnt	Maintenance resource.	OCF_Core_Specification_v1.0.0 section D.6
oic.wk.p	Platform resource.	OCF_Core_Specification_v1.0.0 section D.7
oic.wk.res	Discoverable Resources resource.	OCF_Core_Specification_v1.0.0 section D.9
oic.wk.scenelist	Scene List resource.	OCF_Core_Specification_v1.0.0 section D.11
oic.wk.scenecollection	Scene Member Collection resource.	OCF_Core_Specification_v1.0.0 section D.12
oic.wk.scenemember	Scene Member resource.	OCF_Core_Specification_v1.0.0 section D.13
oic.wk.rd	Resource Directory resource.	OCF_Core_Specification_v1.0.0 section D.14
oic.r.icon	Icon resource.	OCF_Core_Specification_v1.0.0 section D.15
oic.wk.introspection	Introspection resource.	OCF_Core_Specification_v1.0.0 section D.16
oic.r.airquality	Air Quality resource.	OCF_ResourceType_Specification_v1.0.0 section 6.65
oic.r.airqualitycollection	Air Quality Collection resource.	OCF_ResourceType_Specification_v1.0.0 section 6.66
oic.r.consumable	Consumable resource.	OCF_ResourceType_Specification_v1.0.0 section 6.67
oic.r.consumablecollection	Consumable Collection resource.	OCF_ResourceType_Specification_v1.0.0 section 6.68
oic.r.delaydefrost	Delay Defrost resource.	OCF_ResourceType_Specification_v1.0.0 section 6.69
oic.r.ecomode	Ecomode resource.	OCF_ResourceType_Specification_v1.0.0 section 6.70
oic.r.heatingzone	Heating Zone resource.	OCF_ResourceType_Specification_v1.0.0 section 6.71
oic.r.heatingzonecollection	Heating Zone Collection resource.	OCF_ResourceType_Specification_v1.0.0 section 6.72
oic.r.mediasourcelist	Media Source List resource.	OCF_ResourceType_Specification_v1.0.0 section 6.43
oic.r.media.input	Input Media Source List resource.	OCF_ResourceType_Specification_v1.0.0 section 6.44
oic.r.media.output	Output Media Source List resource.	OCF_ResourceType_Specification_v1.0.0 section 6.45
oic.r.movement.ptz	Physical Pan Tilt Zoom resource.	OCF_ResourceType_Specification_v1.0.0 section 6.49
oic.r.image.ptz	Image Pan Tilt Zoom resource.	OCF_ResourceType_Specification_v1.0.0 section 6.49
oic.r.selectablelevels	Selectable Levels resource.	OCF_ResourceType_Specification_v1.0.0 section 6.73
oic.r.value.conditional	Value Conditional resource.	OCF_ResourceType_Specification_v1.0.0 section 6.74
oic.d.airqualitymonitor	Air Quality Monitor device	OCF_SmartHome_Device_Specification_v1.0.0 section 9.1
oic.d.washerdryer	Washer Dryer (Laundry) device	OCF_SmartHome_Device_Specification_v1.0.0 section 9.1
oic.d.cookerhood	Cooker Hood device	OCF_SmartHome_Device_Specification_v1.0.0 section 9.1
oic.d.cooktop	Cooktop device	OCF_SmartHome_Device_Specification_v1.0.0 section 9.1
oic.d.dehumidifier	Dehumidifier device	OCF_SmartHome_Device_Specification_v1.0.0 section 9.1
oic.d.freezer	Freezer device	OCF_SmartHome_Device_Specification_v1.0.0 section 9.1
oic.d.foodprobe	Food Probe device	OCF_SmartHome_Device_Specification_v1.0.0 section 9.1
oic.d.humidifier	Humidifier device	OCF_SmartHome_Device_Specification_v1.0.0 section 9.1
oic.d.stb	Set Top Box device	OCF_SmartHome_Device_Specification_v1.0.0 section 9.1
oic.wk.nmon	Network Monitoring resource.	OCF_Core_Specification_v2.0.1 section D.16
oic.wk.atomicmeasurement	Atomic Measurement resource.	OCF_Core_Specification_v2.0.1 section D.17
oic.d.bridge	Bridge device.	OCF_Bridging_Specification_v2.0.1 section 8
oic.d.virtual	Virtual device.	OCF_Bridging_Specification_v2.0.1 section 8
oic.r.securemode	Secure Mode resource.	OCF_Bridging_Specification_v2.0.1 section 9.2
oic.r.alljoynobject	Alljoyn Object resource.	OCF_Bridging_Specification_v2.0.1 section 9.3
oic.r.easysetup	Easy Setup resource.	OCF_Core_Specification_Extension_Wi-Fi_Easy_Setup_v2.0.1 section A.2
oic.r.wificonf	Wi-Fi Configuration resource.	OCF_Core_Specification_Extension_Wi-Fi_Easy_Setup_v2.0.1 section A.3
oic.r.devconf	Device Configuration resource.	OCF_Core_Specification_Extension_Wi-Fi_Easy_Setup_v2.0.1 section A.4
oic.r.coapcloudconf	CoAP Cloud Configuration.	OCF_Core_Specification_Extension_CoAP_Native_Cloud_v2.0.1 section A.2
oic.r.colour.csc	Colour Space Coordinates resource.	OCF_Resource_Type_Specification_v2.0.1 section 6.75
oic.r.colour.colourtemperature	Colour Temperature resource.	OCF_Resource_Type_Specification_v2.0.1 section 6.76
oic.r.colour.hs	Colour Hue Saturation resource.	OCF_Resource_Type_Specification_v2.0.1 section 6.77
oic.r.batterymaterial	Battery Material resource.	OCF_Resource_Type_Specification_v2.0.1 section 6.78
oic.r.brewing	Brewing resource.	OCF_Resource_Type_Specification_v2.0.1 section 6.79
oic.r.energy.electrical	Electrical Energy resource.	OCF_Resource_Type_Specification_v2.0.1 section 6.80
oic.r.energy.generation	Energy Generation resource.	OCF_Resource_Type_Specification_v2.0.1 section 6.81
oic.r.foaming	Foaming resource.	OCF_Resource_Type_Specification_v2.0.1 section 6.82
oic.r.grinder	Grinder resource.	OCF_Resource_Type_Specification_v2.0.1 section 6.83
oic.r.liquid.level	Liquid Level resource.	OCF_Resource_Type_Specification_v2.0.1 section 6.84
oic.r.vehicle.connector	Electric Vehicle Connector resource.	OCF_Resource_Type_Specification_v2.0.1 section 6.85
oic.r.time.stamp	Time Stamp resource.	OCF_Resource_Type_Specification_v2.0.1 section 6.86
oic.r.printer.3d	3D Printer resource.	OCF_Resource_Type_Specification_v2.0.1 section 6.87
oic.r.blood.pressure	Blood Pressure resource.	OCF_Resource_Type_Specification_v2.0.1 section 6.88
oic.r.bloodpressuremonitor-am	Blood Pressure Monitor Atomic Measurement resource.	OCF_Resource_Type_Specification_v2.0.1 section 6.89
oic.r.bmi	Body Mass Index (BMI) resource.	OCF_Resource_Type_Specification_v2.0.1 section 6.90
oic.r.body.fat	Body Fat resource.	OCF_Resource_Type_Specification_v2.0.1 section 6.91
oic.r.body.ffm	Body Fat Free Mass resource.	OCF_Resource_Type_Specification_v2.0.1 section 6.92
oic.r.body.location	Body Location resource.	OCF_Resource_Type_Specification_v2.0.1 section 6.93
oic.r.body.location.temperature	Body Location Temperature resource.	OCF_Resource_Type_Specification_v2.0.1 section 6.94
oic.r.bodyscale-am	Body Scale Atomic Measurement resource.	OCF_Resource_Type_Specification_v2.0.1 section 6.95
oic.r.body.slm	Body Soft Lean Mass resource.	OCF_Resource_Type_Specification_v2.0.1 section 6.96
oic.r.bodythermometer-am	Body Thermometer Atomic Measurement resource.	OCF_Resource_Type_Specification_v2.0.1 section 6.97
oic.r.body.water	Body Water resource.	OCF_Resource_Type_Specification_v2.0.1 section 6.98
oic.r.glucose	Glucose resource.	OCF_Resource_Type_Specification_v2.0.1 section 6.99
oic.r.glucose.carb	Glucose Meter Complex Carbohydrates resource.	OCF_Resource_Type_Specification_v2.0.1 section 6.100
oic.r.glucose.exercise	Glucose Meter Exercise resource.	OCF_Resource_Type_Specification_v2.0.1 section 6.101
oic.r.glucose.hba1c	Glucose Meter HbA1c resource.	OCF_Resource_Type_Specification_v2.0.1 section 6.102
oic.r.glucose.health	Glucose Meter Context Health resource.	OCF_Resource_Type_Specification_v2.0.1 section 6.103
oic.r.glucose.meal	Glucose Meter Context Meal resource.	OCF_Resource_Type_Specification_v2.0.1 section 6.104
oic.r.glucose.medication	Glucose Meter Context Medication resource.	OCF_Resource_Type_Specification_v2.0.1 section 6.105
oic.r.glucosemeter-am	Glucose Meter Atomic Measurement resource.	OCF_Resource_Type_Specification_v2.0.1 section 6.106
oic.r.glucose.samplelocation	Glucose Meter Context Sample Location resource.	OCF_Resource_Type_Specification_v2.0.1 section 6.107
oic.r.glucose.tester	Glucose Meter Context Tester resource.	OCF_Resource_Type_Specification_v2.0.1 section 6.108
oic.r.orfid.station	Optical RFID Station resource.	OCF_Resource_Type_Specification_v2.0.1 section 6.109
oic.r.orfid.tag	Optical RFID Tag resource.	OCF_Resource_Type_Specification_v2.0.1 section 6.110
oic.r.powersource	Power Source resource	OCF_Resource_Type_Specification_v2.0.1 section 6.111
oic.r.printer.queue	Print Queue resource.	OCF_Resource_Type_Specification_v2.0.1 section 6.112
oic.r.pulserate	Pulse Rate resource.	OCF_Resource_Type_Specification_v2.0.1 section 6.113
oic.r.sensor.props	Sensor Properties resource.	OCF_Resource_Type_Specification_v2.0.1 section 6.114
oic.r.userid	User ID resource.	OCF_Resource_Type_Specification_v2.0.1 section 6.115
oic.d.waterheater	Water Heater device.	OCF_Device_Specification_v2.0.1 section A.2
oic.d.furnace	Furnace device.	OCF_Device_Specification_v2.0.1 section A.2
oic.d.pump	Pump device.	OCF_Device_Specification_v2.0.1 section A.2
oic.d.condensingunit	Condensing Unit device.	OCF_Device_Specification_v2.0.1 section A.2
oic.d.condenser	Condenser device.	OCF_Device_Specification_v2.0.1 section A.2
oic.d.hvac	HVAC device.	OCF_Device_Specification_v2.0.1 section A.2
oic.d.lightingcontrol	Lighting Controls device.	OCF_Device_Specification_v2.0.1 section A.2
oic.d.icemachine	Ice Machine device.	OCF_Device_Specification_v2.0.1 section A.2
oic.d.range	Range device.	OCF_Device_Specification_v2.0.1 section A.2
oic.d.steamcloset	Steam Closet device.	OCF_Device_Specification_v2.0.1 section A.2
oic.d.audiosystem	Audio System device.	OCF_Device_Specification_v2.0.1 section A.2
oic.d.avplayer	AV Player device.	OCF_Device_Specification_v2.0.1 section A.2
oic.d.desktoppc	Desktop PC device.	OCF_Device_Specification_v2.0.1 section A.2
oic.d.notebookpc	Notebook PC device.	OCF_Device_Specification_v2.0.1 section A.2
oic.d.server	Server device.	OCF_Device_Specification_v2.0.1 section A.2
oic.d.pc	Computer device.	OCF_Device_Specification_v2.0.1 section A.2
oic.d.datastorageunit	Data Storage Unit device.	OCF_Device_Specification_v2.0.1 section A.2
oic.d.display	Display device.	OCF_Device_Specification_v2.0.1 section A.2
oic.d.portableelectronics	Portable Electronics device.	OCF_Device_Specification_v2.0.1 section A.2
oic.d.gameconsole	Game Console device.	OCF_Device_Specification_v2.0.1 section A.2
oic.d.3dprinter	3D Printer device.	OCF_Device_Specification_v2.0.1 section A.2
oic.d.musicalinstrument	Musical Instrument device.	OCF_Device_Specification_v2.0.1 section A.2
oic.d.networking	Networking Equipment device.	OCF_Device_Specification_v2.0.1 section A.2
oic.d.handset	Handset device.	OCF_Device_Specification_v2.0.1 section A.2
oic.d.telephonydevice	Telephony device.	OCF_Device_Specification_v2.0.1 section A.2
oic.d.speaker	Active Speaker device.	OCF_Device_Specification_v2.0.1 section A.2
oic.d.smallelectrical	Electronics device.	OCF_Device_Specification_v2.0.1 section A.2
oic.d.aircompressor	Air Compressor device.	OCF_Device_Specification_v2.0.1 section A.2
oic.d.bathroomdevice	Bathroom General device.	OCF_Device_Specification_v2.0.1 section A.2
oic.d.batterycharger	Battery Charger device.	OCF_Device_Specification_v2.0.1 section A.2
oic.d.businessequipment	Business Equipment device.	OCF_Device_Specification_v2.0.1 section A.2
oic.d.portablestove	Portable Stove device.	OCF_Device_Specification_v2.0.1 section A.2
oic.d.exercisemachine	Exercise Machine device.	OCF_Device_Specification_v2.0.1 section A.2
oic.d.hvacportable	Portable HVAC device.	OCF_Device_Specification_v2.0.1 section A.2
oic.d.orfid	Optical Augmented RFID Reader device.	OCF_Device_Specification_v2.0.1 section A.2
oic.d.coffeemachine	Coffee Machine device.	OCF_Device_Specification_v2.0.1 section A.2
oic.d.grinder	Grinder device.	OCF_Device_Specification_v2.0.1 section A.2
oic.d.kettle	Kettle device.	OCF_Device_Specification_v2.0.1 section A.2
oic.d.lightdecorative	Decorative Lighting device.	OCF_Device_Specification_v2.0.1 section A.2
oic.d.lightemergency	Emergency Lighting device.	OCF_Device_Specification_v2.0.1 section A.2
oic.d.microwave	Microwave Oven device.	OCF_Device_Specification_v2.0.1 section A.2
oic.d.vendingmachine	Vending Machine device.	OCF_Device_Specification_v2.0.1 section A.2
oic.d.waterdispenser	Water Dispenser device.	OCF_Device_Specification_v2.0.1 section A.2
oic.d.battery	Battery device.	OCF_Device_Specification_v2.0.1 section A.2
oic.d.window	Window device.	OCF_Device_Specification_v2.0.1 section A.2
oic.d.fireplace	Fireplace device.	OCF_Device_Specification_v2.0.1 section A.2
oic.d.energygenerator	Energy Generator device.	OCF_Device_Specification_v2.0.1 section A.2
oic.d.electricmeter	Electric Meter device.	OCF_Device_Specification_v2.0.1 section A.2
oic.d.electricvehiclecharger	Electric Vehicle Charger device.	OCF_Device_Specification_v2.0.1 section A.2
oic.d.fitnessdevice	Fitness device.	OCF_Device_Specification_v2.0.1 section A.2
oic.d.bloodpressuremonitor	Blood Pressure Monitor device.	OCF_Device_Specification_v2.0.1 section A.2
oic.d.bodythermometer	Body Thermometer device.	OCF_Device_Specification_v2.0.1 section A.2
oic.d.medicaldevice	Media device.	OCF_Device_Specification_v2.0.1 section A.2
oic.d.glucosemeter	Glucose Meter device.	OCF_Device_Specification_v2.0.1 section A.2
oic.d.bodyscale	Body Scale device.	OCF_Device_Specification_v2.0.1 section A.2
oic.d.personalhealthdevice	Personal Health device.	OCF_Device_Specification_v2.0.1 section A.2
oic.d.unknown	Other device.	OCF_Device_Specification_v2.0.1 section A.2
oic.r.doxm	Device Owner Transfer resource	OCF_Security_Specification_v2.0.1 section 13.1
oic.r.cred	Credential resource	OCF_Security_Specification_v2.0.1 section 13.2
oic.r.crl	Certificate Revocation List resource	OCF_Security_Specification_v2.0.1 section 13.3
oic.r.acl	Access Control List resource	OCF_Security_Specification_v2.0.1 section 13.4
oic.r.acl2	Access Control List 2 resource	OCF_Security_Specification_v2.0.1 section 13.4
oic.r.amacl	Access Manager ACL resource	OCF_Security_Specification_v2.0.1 section 13.5
oic.r.sacl	Signed ACL resource	OCF_Security_Specification_v2.0.1 section 13.6
oic.r.pstat	Provisioning Status resource	OCF_Security_Specification_v2.0.1 section 13.7
oic.r.csr	Certificate Signing Request resource	OCF_Security_Specification_v2.0.1 section 13.8
oic.r.roles	Roles resource	OCF_Security_Specification_v2.0.1 section 13.9
oic.r.account	Account resource	OCF_Security_Specification_v2.0.1 section 13.10
oic.r.session	Account Session resource	OCF_Security_Specification_v2.0.1 section 13.11
oic.r.tokenrefresh	Account Token Refresh resource	OCF_Security_Specification_v2.0.1 section 13.12
fa.cs	Resource type for the Fairhair common services	Fairhair Alliance specification section 5.2.2
fa.rd-conf	Resource type for the Fairhair resource that configures and manages information about RDs on FA devices	Fairhair Alliance specification section 4.6.1.4
fa.lnk	Resource type for the Fairhair Linkage resource	Fairhair Alliance specification section 5.5.2
fa.rd-id	Resource type for the Fairhair resource that Identifies the resource which configures and manages RD identity information	Fairhair Alliance specification section 4.6.1.5
oic.d.activitytracker	Activity Tracker device.	OCF_Device_Specification_v2.0.5 clause A.2
oic.d.ams	Access Management Service.	OCF_Device_Specification_v2.0.5 clause A.2
oic.d.cgm	Continuous Glucose Meter device.	OCF_Device_Specification_v2.0.5 clause A.2
oic.d.circuitbreaker	Circuit Breaker device.	OCF_Device_Specification_v2.0.5 clause A.2
oic.d.cms	Credential Management Service.	OCF_Device_Specification_v2.0.5 clause A.2
oic.d.cyclingcadencesensor	Cycling cadence sensor device.	OCF_Device_Specification_v2.0.5 clause A.2
oic.d.cyclingpowermeter	Cycling power meter device.	OCF_Device_Specification_v2.0.5 clause A.2
oic.d.cyclingspeedsensor	Cycling speed sensor device.	OCF_Device_Specification_v2.0.5 clause A.2
oic.d.dots	Device Ownership Transfer Service.	OCF_Device_Specification_v2.0.5 clause A.2
oic.d.energymonitor	Energy Monitor device.	OCF_Device_Specification_v2.0.5 clause A.2
oic.d.heartratemonitor	Heart Rate Monitor device.	OCF_Device_Specification_v2.0.5 clause A.2
oic.d.inverter	Inverter device.	OCF_Device_Specification_v2.0.5 clause A.2
oic.d.pulseoximeter	Pulse Oximeter device.	OCF_Device_Specification_v2.0.5 clause A.2
oic.d.pvarraysystem	Photovoltaic Array System device.	OCF_Device_Specification_v2.0.5 clause A.2
oic.d.sleepmonitor	Sleep Monitor device.	OCF_Device_Specification_v2.0.5 clause A.2
oic.d.waterpurifier	Water Purifier device.	OCF_Device_Specification_v2.0.5 clause A.2
oic.r.activity	Activity resource.	OCF_Resource_Type_Specification_v2.0.5 clause 6.127
oic.r.activitytracker-am	Activity tracker measurement with activity, heart rate, etc.	OCF_Resource_Type_Specification_v2.0.5 clause 6.128
oic.r.alarm	Alarm resource.	OCF_Resource_Type_Specification_v2.0.5 clause 6.129
oic.r.alert	Alerts resource type	OCF_Core_Optional_Specification_v2.0.5 clause A.10
oic.r.alertcollection	Alerts Collection resource type	OCF_Core_Optional_Specification_v2.0.5 clause A.11
oic.r.cadence	Cadence resource.	OCF_Resource_Type_Specification_v2.0.5 clause 6.144
oic.r.calorificvalue	Energy associated with the consumption of various fuels.	OCF_Resource_Type_Specification_v2.0.5 clause 6.116
oic.r.cgm.calibrate	Continuous Glucose Meter calibration resource.	OCF_Resource_Type_Specification_v2.0.5 clause 6.131
oic.r.cgm.samplinginterval	Continuous Glucose Meter sampling interval resource.	OCF_Resource_Type_Specification_v2.0.5 clause 6.132
oic.r.cgm.sensor	Continuous Glucose Meter sensor resource.	OCF_Resource_Type_Specification_v2.0.5 clause 6.133
oic.r.cgm.status	Continuous Glucose Meter status resource.	OCF_Resource_Type_Specification_v2.0.5 clause 6.134
oic.r.cgm.threshold	Continuous Glucose Meter threshold resource.	OCF_Resource_Type_Specification_v2.0.5 clause 6.135
oic.r.cgm-am	Resource for glucose, sensor, time, and user data.	OCF_Resource_Type_Specification_v2.0.5 clause 6.130
oic.r.circuitbreaker	Circuit Breaker resource.	OCF_Resource_Type_Specification_v2.0.5 clause 6.145
oic.r.conversionfactor	Property used in calculating conversions.	OCF_Resource_Type_Specification_v2.0.5 clause 6.117
oic.r.cyclingpower	Cycling power resource.	OCF_Resource_Type_Specification_v2.0.5 clause 6.146
oic.r.gas.consumption	Energy values associated with gas consumption.	OCF_Resource_Type_Specification_v2.0.5 clause 6.118
oic.r.gas.usage	Cumulative time-based gas usage query.	OCF_Resource_Type_Specification_v2.0.5 clause 6.119
oic.r.heartrate	Heart rate resource.	OCF_Resource_Type_Specification_v2.0.5 clause 6.136
oic.r.heartratemonitor-am	Resource for heart rate, time, and user data.	OCF_Resource_Type_Specification_v2.0.5 clause 6.137
oic.r.iaszone	Resource that includes iaszoneinfo, battery, and power source information	OCF_Resource_Type_Specification_v2.0.5 clause 6.125
oic.r.iaszoneinfo	Intruder Alert System (IAS) Zone information resource	OCF_Resource_Type_Specification_v2.0.5 clause 6.124
oic.r.impactsensor	Impact sensor resource.	OCF_Resource_Type_Specification_v2.0.5 clause 6.120
oic.r.inverter	Inverter resource.	OCF_Resource_Type_Specification_v2.0.5 clause 6.147
oic.r.keypadchar	Character keypad resource.	OCF_Resource_Type_Specification_v2.0.5 clause 6.121
oic.r.opaquedata	Opaque data transferred and uninterpretable at endpoints.	OCF_Resource_Type_Specification_v2.0.5 clause 6.122
oic.r.pulsatilecharacteristic	Pulsatile characteristic of the pulsative wave of a pulse oximeter.	OCF_Resource_Type_Specification_v2.0.5 clause 6.138
oic.r.pulsatileoccurrence	Pulsatile occurrence of a pulse oximeter.	OCF_Resource_Type_Specification_v2.0.5 clause 6.139
oic.r.pulseoximeter-am	Resource for SpO2, pulse data, observed time, and user data.	OCF_Resource_Type_Specification_v2.0.5 clause 6.140
oic.r.pvconnectionterminal	Photovoltaic connection terminal resource.	OCF_Resource_Type_Specification_v2.0.5 clause 6.148
oic.r.sleep	Sleep resource.	OCF_Resource_Type_Specification_v2.0.5 clause 6.141
oic.r.sleepmonitor-am	Resource for sleep stages and sleep score data.	OCF_Resource_Type_Specification_v2.0.5 clause 6.142
oic.r.softwareupdate	Software Update resource type	OCF_Core_Optional_Specification_v2.0.5 clause A.12
oic.r.sp	Security Profile	OCF_Security_Specification_v2.0.5 clause 14.8
oic.r.speed	Speed resource.	OCF_Resource_Type_Specification_v2.0.5 clause 6.149
oic.r.spo2	Blood oxygen saturation level resource.	OCF_Resource_Type_Specification_v2.0.5 clause 6.143
oic.r.torque	Torque resource.	OCF_Resource_Type_Specification_v2.0.5 clause 6.150
oic.r.userid	User identification resource.	OCF_Resource_Type_Specification_v2.0.5 clause 6.123
oic.r.vodlist	Virtual OCF Device resource.	OCF_Bridging_Specification_v2.0.5 clause 5.5
oic.r.waterinfo	Water information resource.	OCF_Resource_Type_Specification_v2.0.5 clause 6.151
oic.r.windowcovering	Configurable window covering resource	OCF_Resource_Type_Specification_v2.0.5 clause 6.126
ace.est.crts	This resource depicts the support of EST GET cacerts.	RFC 9148
ace.est.sen	This resource depicts the support of EST simple enroll.	RFC 9148
ace.est.sren	This resource depicts the support of EST simple reenroll.	RFC 9148
ace.est.att	This resource depicts the support of EST GET CSR attributes.	RFC 9148
ace.est.skg	This resource depicts the support of EST server-side key generation with the returned certificate in a PKCS #7 container.	RFC 9148
ace.est.skc	This resource depicts the support of EST server-side key generation with the returned certificate in application/pkix-cert format.	RFC 9148
oic.d.bodycompositionanalyser	Body Composition Analyser device	OCF Device Specification v2.1.2 clause A.2
oic.d.indoorgarden	Indoor Garden device	OCF Device Specification v2.1.2 clause A.2
oic.d.mattress	Mattress device	OCF Device Specification v2.1.2 clause A.2
oic.d.muscleoxygenmonitor	Muscle Oxygen Monitor device	OCF Device Specification v2.1.2 clause A.2
oic.r.ael	Auditable Event List	OCF Security Specification v2.1.2 clause C.9
oic.r.bodycompositionanalyser-am	Body Composition Analyser resource	OCF Resource Type Specification v2.1.2 clause 6.155
oic.r.deodorization	Deodorization resource	OCF Resource Type Specification v2.1.2 clause 6.152
oic.r.hvac.capacity	HVAC Capacity resource	OCF Resource Type Specification v2.1.2 clause 6.157
oic.r.keycardswitch	Keycard Switch resource	OCF Resource Type Specification v2.1.2 clause 6.153
oic.r.media.audio	Media (Audio) resource	OCF Resource Type Specification v2.1.2 clause 6.158
oic.r.media.core	Media (Core) resource	OCF Resource Type Specification v2.1.2 clause 6.159
oic.r.media.image	Media (Image) resource	OCF Resource Type Specification v2.1.2 clause 6.160
oic.r.media.text	Media (Text) resource	OCF Resource Type Specification v2.1.2 clause 6.161
oic.r.media.video	Media (Video) resource	OCF Resource Type Specification v2.1.2 clause 6.162
oic.r.muscleoxygensaturation	Muscle Oxygen Saturation resource	OCF Resource Type Specification v2.1.2 clause 6.154
oic.r.switch.fault	Fault Interrupter resource	OCF Resource Type Specification v2.1.2 clause 6.156
oic.r.switch.restricted	Restricted Switch resource	OCF Resource Type Specification v2.1.2 clause 6.163
oic.d.afci	Arc Fault Circuit Interrupter	OCF Device Specification v2.2.0 clause A.2
oic.d.airer	Airer	OCF Device Specification v2.2.0 clause A.2
oic.d.gfci	Ground Fault Circuit Interrupter	OCF Device Specification v2.2.0 clause A.2
oic.r.sdi	Security Domain Information	OCF Security Specification v2.2.0 clause C.10
oic.r.settings.accessibility	Device Settings - Accessibility	OCF Resource Type Specification v2.2.0 clause 6.164
oic.r.settings.broadcasting	Device Settings - Broadcasting	OCF Resource Type Specification v2.2.0 clause 6.165
oic.r.settings.picture	Device Settings - Picture	OCF Resource Type Specification v2.2.0 clause 6.166
oic.r.settings.sound	Device Settings - Sound	OCF Resource Type Specification v2.2.0 clause 6.167
oic.r.settings.support	Device Settings - Support	OCF Resource Type Specification v2.2.0 clause 6.168
oic.r.settings.system	Device Settings - System	OCF Resource Type Specification v2.2.0 clause 6.169
oic.r.sensor.measurement	Generic Measurement Sensor	OCF_Resource_Type_Specification_v2.2.2 clause 6.170
oic.r.sensor.radiation.uva	UVA Radiation	OCF_Resource_Type_Specification_v2.2.2 clause 6.171
oic.r.sensor.radiation.uvb	UVB Radiation	OCF_Resource_Type_Specification_v2.2.2 clause 6.172
oic.r.colour.renderingindex	Colour Rendering Index	OCF_Resource_Type_Specification_v2.2.2 clause 6.173
oic.r.sound.pressure	Sound Pressure in Pascal	OCF_Resource_Type_Specification_v2.2.2 clause 6.174
oic.r.sound.pressurelevel	Sound Pressure Level in dB	OCF_Resource_Type_Specification_v2.2.2 clause 6.175
oic.r.location.civic	Civic Location	OCF_Resource_Type_Specification_v2.2.2 clause 6.176
ace.ai	ACE-OAuth authz-info endpoint resource.	RFC 9200
oic.d.acassistant	A/C Assistant	OCF_Device_Specification_v2.2.4 clause A.2
oic.d.dali	Light (DALI) Device	OCF_Device_Specification_v2.2.4 clause A.2
oic.d.dali.ac	Light (DALI) Application Controller	OCF_Device_Specification_v2.2.4 clause A.2
oic.d.dali.bus	Light (DALI) Bus	OCF_Device_Specification_v2.2.4 clause A.2
oic.d.light.smart	Smart Light	OCF_Device_Specification_v2.2.4 clause A.2
oic.d.wallpad	Wallpad	OCF_Device_Specification_v2.2.4 clause A.2
oic.r.remotecontrol	Remote Control	OCF_Resource_Type_Specification_v2.2.4 clause 7.177
oic.r.tv.apps	TV Apps	OCF_Resource_Type_Specification_v2.2.4 clause 7.178
oic.r.vendorlist	Vendor List	OCF_Resource_Type_Specification_v2.2.4 clause 7.179
oic.r.dali	DALI	OCF_Resource_Type_Specification_v2.2.4 clause 7.180
oic.r.dali.conf	DALI Configuration	OCF_Resource_Type_Specification_v2.2.4 clause 7.181
wot.directory	link to WoT Thing Description of a Thing Description Directory	Web of Things (WoT) Discovery, Section 6.4
wot.thing	link to WoT Thing Description of a Thing	Web of Things (WoT) Discovery, Section 6.4
core.edhoc	EDHOC resource	RFC 9528
core.coap-eap	CoAP-EAP resource	RFC 9820
core.dns	DNS over CoAP resource	RFC 9953, Section 3
core.osc.gm	Group-membership resource of an OSCORE Group Manager	RFC-ietf-ace-key-groupcomm-oscore-21
core.osc.gcoll	Group-collection resource of an OSCORE Group Manager	RFC-ietf-ace-oscore-gm-admin-17
core.osc.gconf	Group-configuration resource of an OSCORE Group Manager	RFC-ietf-ace-oscore-gm-admin-17

Interface Description (if=) Link Target Attribute Values

Expert(s)

Carsten Bormann, Jaime Jimenez, Christian Amsüss

Reference

RFC 6690: Constrained RESTful Environments (CoRE) Link Format

Note

Available Formats

Range	Registration Procedures
value starts with "core"	IETF Review
all other values	Specification Required

Value	Description	Reference
oic.if.baseline	The baseline Interface defines a view into all Properties of a Resource including the Meta Properties. This Interface is used to operate on the full Representation of a Resource.	OIC_Core_Specification_v1.1.0 section 7.5.3
oic.if.ll	The 'links list' Interface provides a view into Links in a Collection (Resource). Since Links represent relationships to other Resources, the links list interfaces may be used to discover Resources with respect to a context. The discovery is done by retrieving Links to these Resources.	OIC_Core_Specification_v1.1.0 section 7.5.3
oic.if.b	The batch Interface is used to interact with a collection of Resources at the same time. This also removes the need for the Client to first discover the Resources it is manipulating - the Server forwards the requests and aggregates the responses.	OIC_Core_Specification_v1.1.0 section 7.5.3
oic.if.r	The read-only Interface exposes the Properties of a Resource that may be 'read'. This Interface does not provide methods to update Properties or a Resource and so can only be used to 'read' Property Values.	OIC_Core_Specification_v1.1.0 section 7.5.3
oic.if.rw	The read-write Interface exposes only those Properties that may be both 'read' and 'written' and provides methods to read and write the Properties of a Resource.	OIC_Core_Specification_v1.1.0 section 7.5.3
oic.if.a	The actuator Interface is used to read or write the Properties of an actuator Resource.	OIC_Core_Specification_v1.1.0 section 7.5.3
oic.if.s	The sensor Interface is used to read the Properties of a sensor Resource.	OIC_Core_Specification_v1.1.0 section 7.5.3
bbf.usp.c	USP Controller Endpoint of the Broadband Forum USP protocol	https://usp.technology/specification/mtp/coap/
bbf.usp.a	USP Agent Endpoint of the Broadband Forum USP protocol	https://usp.technology/specification/mtp/coap/
oic.if.create	The create OCF Interface is used to create new Resources in a Collection. Both the Resource and the Link pointing to it are created in a single atomic operation.	OCF_Core_Specification_v2.0.5 clause 7.6.3.9
ace.groups	The KDC interface at the parent resource of group-membership resources is used to retrieve names of security groups using the ACE framework.	RFC 9594, Section 4.1
ace.group	The KDC interface at a group-membership resource is used to provision keying material and related information and policies to members of the corresponding security group using the ACE framework.	RFC 9594, Section 4.1

CoAP Codes

Registration Procedure(s)

Reserved ranges may be allocated in accordance with Section 4.3 of RFC 8126.

Reference

RFC 7252, Section 12.1: The Constrained Application Protocol (CoAP)

Available Formats

Code	Description	Reference
0.00	Indicates an Empty message.	RFC 7252, Section 4.1
0.01-0.31	Indicates a request. Values in this range are assigned by the CoAP Method Codes sub-registry.	RFC 7252, Section 12.1.1
1.00-1.31	Reserved	RFC 7252
2.00-5.31	Indicates a response. Values in this range are assigned by the CoAP Response Codes sub-registry.	RFC 7252, Section 12.1.2
6.00-7.31	Reserved	RFC 7252

CoAP Method Codes

Registration Procedure(s)

IETF Review or IESG Approval

Reference

RFC 7252, Section 12.1.1: The Constrained Application Protocol (CoAP)

Available Formats

Code	Name	Reference
0.01	GET	RFC 7252
0.02	POST	RFC 7252
0.03	PUT	RFC 7252
0.04	DELETE	RFC 7252
0.05	FETCH	RFC 8132
0.06	PATCH	RFC 8132
0.07	iPATCH	RFC 8132
0.08-0.31	Unassigned

CoAP Response Codes

Registration Procedure(s)

IETF Review or IESG Approval

Reference

RFC 7252, Section 12.1.2: The Constrained Application Protocol (CoAP)

Available Formats

Code	Description	Reference
2.00	Unassigned
2.01	Created	RFC 7252
2.02	Deleted	RFC 7252
2.03	Valid	RFC 7252
2.04	Changed	RFC 7252
2.05	Content	RFC 7252
2.06-2.30	Unassigned
2.31	Continue	RFC 7959
3.00-3.31	Reserved	RFC 7252
4.00	Bad Request	RFC 7252
4.01	Unauthorized	RFC 7252
4.02	Bad Option	RFC 7252
4.03	Forbidden	RFC 7252
4.04	Not Found	RFC 7252
4.05	Method Not Allowed	RFC 7252
4.06	Not Acceptable	RFC 7252
4.07	Unassigned
4.08	Request Entity Incomplete	RFC 7959
4.09	Conflict	RFC 8132
4.10-4.11	Unassigned
4.12	Precondition Failed	RFC 7252
4.13	Request Entity Too Large	RFC 7252; RFC 7959
4.14	Unassigned
4.15	Unsupported Content-Format	RFC 7252
4.16-4.21	Unassigned
4.22	Unprocessable Entity	RFC 8132
4.23-4.28	Unassigned
4.29	Too Many Requests	RFC 8516
4.30-4.31	Unassigned
5.00	Internal Server Error	RFC 7252
5.01	Not Implemented	RFC 7252
5.02	Bad Gateway	RFC 7252
5.03	Service Unavailable	RFC 7252
5.04	Gateway Timeout	RFC 7252
5.05	Proxying Not Supported	RFC 7252
5.06-5.07	Unassigned
5.08	Hop Limit Reached	RFC 8768
5.09-5.31	Unassigned

CoAP Option Numbers

Expert(s)

Bilhanan Silverajan (primary), Klaus Hartke (secondary), Carsten Bormann (secondary), Jaime Jimenez (secondary), Alexander Pelov (secondary)

Reference

RFC 7252, Section 12.2: The Constrained Application Protocol (CoAP)

Available Formats

Range	Registration Procedures
0-255	IETF Review or IESG Approval
256-2047	Specification Required
2048-64999	Expert Review
65000-65535	Experimental use (no operational use)

Number	Name	Reference
0	Reserved	RFC 7252
1	If-Match	RFC 7252; RFC 8613
2	Unassigned
3	Uri-Host	RFC 7252; RFC 8613
4	ETag	RFC 7252; RFC 8613
5	If-None-Match	RFC 7252; RFC 8613
6	Observe	RFC 7641; RFC 8613
7	Uri-Port	RFC 7252; RFC 8613
8	Location-Path	RFC 7252; RFC 8613
9	OSCORE	RFC 8613
10	Unassigned
11	Uri-Path	RFC 7252; RFC 8613
12	Content-Format	RFC 7252; RFC 8613
13	Unassigned
14	Max-Age	RFC 7252; RFC 8516; RFC 8613
15	Uri-Query	RFC 7252; RFC 8613
16	Hop-Limit	RFC 8768
17	Accept	RFC 7252; RFC 8613
18	Unassigned
19	Q-Block1	RFC 9177
20	Location-Query	RFC 7252; RFC 8613
21	EDHOC	RFC 9668
22	Unassigned
23	Block2	RFC 7959; RFC 8323; RFC 8613
24-26	Unassigned
27	Block1	RFC 7959; RFC 8323; RFC 8613
28	Size2	RFC 7959; RFC 8613
29-30	Unassigned
31	Q-Block2	RFC 9177
32-34	Unassigned
35	Proxy-Uri	RFC 7252; RFC 8613
36-38	Unassigned
39	Proxy-Scheme	RFC 7252; RFC 8613
40-59	Unassigned
60	Size1	RFC 7252; RFC 8613
61-127	Unassigned
128	Reserved	RFC 7252
129-131	Unassigned
132	Reserved	RFC 7252
133-135	Unassigned
136	Reserved	RFC 7252
137-139	Unassigned
140	Reserved	RFC 7252
141-234	Unassigned
235	Proxy-Cri	RFC-ietf-core-href-29
236-238	Unassigned
239	Proxy-Scheme-Number	RFC-ietf-core-href-29
240-251	Unassigned
252	Echo	RFC 9175
253-257	Unassigned
258	No-Response	RFC 7967; RFC 8613
259-291	Unassigned
292	Request-Tag	RFC 9175
293-2048	Unassigned
2049	OCF-Accept-Content-Format-Version	Michael Koster
2050-2052	Unassigned
2053	OCF-Content-Format-Version	Michael Koster
2054	Unassigned
2055	SCP82-Params	GPC_SPE_207
2056	X-Admin-Protocol	SGP.32 v1.3
2057-64999	Unassigned
65000-65535	Reserved for Experimental Use	RFC 7252

CoAP Content-Formats

Expert(s)

Esko Dijk (primary), Klaus Hartke (secondary), Carsten Bormann (secondary), Jaime Jimenez (secondary), Alexander Pelov (secondary)

Reference

RFC 7252, Section 12.3: The Constrained Application Protocol (CoAP)
RFC Errata 4954
RFC 9876: Updates to the IANA Registration Procedures for Constrained Application Protocol (CoAP) Content-Formats

Note

As per RFC 9876, temporary registrations within the 0-255 range are approved by designated experts. These registrations are not subject to the formal renewal process in RFC 7120.

Available Formats

Range	Registration Procedures	Note
0-255	Expert Review	Review procedure described in RFC 9876, Section 4.1.3..
256-9999	IETF Review with Expert Review or IESG Approval with Expert Review	Review procedure described in RFC 9876, Section 4.1.3..
10000-19999	Expert Review	Review procedure described in RFC 9876, Section 4.1.3..
20000-32999	First Come First Served	FCFS is allowed if the registration has no parameters, the registration has an empty Content Coding, the Media Type is not yet used in this registry, and the Media Type is registered (or approved for registration) in the Media Types registry.
33000-64997	Expert Review	Review procedure described in RFC 9876, Section 4.1.3..
64998-64999	Reserved for Documentation
65000-65535	Experimental Use	No operational use

Content Type	Content Coding	Media Type	ID	Reference
text/plain; charset=utf-8		text/plain	0	RFC 2046; RFC 3676; RFC 5147
Unassigned			1-15
application/cose; cose-type="cose-encrypt0"		application/cose	16	RFC 9052
application/cose; cose-type="cose-mac0"		application/cose	17	RFC 9052
application/cose; cose-type="cose-sign1"		application/cose	18	RFC 9052
application/ace+cbor		application/ace+cbor	19	RFC 9200
Unassigned			20
image/gif		image/gif	21	https://www.w3.org/Graphics/GIF/spec-gif89a.txt
image/jpeg		image/jpeg	22	ISO/IEC 10918-5
image/png		image/png	23	PNG
Unassigned			24-39
application/link-format		application/link-format	40	RFC 6690
application/xml		application/xml	41	RFC 3023
application/octet-stream		application/octet-stream	42	RFC 2045; RFC 2046
Unassigned			43-46
application/exi		application/exi	47	"Efficient XML Interchange (EXI) Format 1.0 (Second Edition)", February 2014
Unassigned			48-49
application/json		application/json	50	RFC 8259
application/json-patch+json		application/json-patch+json	51	RFC 6902
application/merge-patch+json		application/merge-patch+json	52	RFC 7396
Unassigned			53-59
application/cbor		application/cbor	60	RFC 8949
application/cwt		application/cwt	61	RFC 8392
application/multipart-core		application/multipart-core	62	RFC 8710
application/cbor-seq		application/cbor-seq	63	RFC 8742
application/edhoc+cbor-seq		application/edhoc+cbor-seq	64	RFC 9528
application/cid-edhoc+cbor-seq		application/cid-edhoc+cbor-seq	65	RFC 9528
Unassigned			66-95
application/cose; cose-type="cose-encrypt"		application/cose	96	RFC 9052
application/cose; cose-type="cose-mac"		application/cose	97	RFC 9052
application/cose; cose-type="cose-sign"		application/cose	98	RFC 9052
Unassigned			99-100
application/cose-key		application/cose-key	101	RFC 9052
application/cose-key-set		application/cose-key-set	102	RFC 9052
Unassigned			103-109
application/senml+json		application/senml+json	110	RFC 8428
application/sensml+json		application/sensml+json	111	RFC 8428
application/senml+cbor		application/senml+cbor	112	RFC 8428
application/sensml+cbor		application/sensml+cbor	113	RFC 8428
application/senml-exi		application/senml-exi	114	RFC 8428
application/sensml-exi		application/sensml-exi	115	RFC 8428
Unassigned			116-139
application/yang-data+cbor; id=sid		application/yang-data+cbor	140	RFC 9254
Unassigned			141-255
application/coap-group+json		application/coap-group+json	256	RFC 7390
application/concise-problem-details+cbor		application/concise-problem-details+cbor	257	RFC 9290
application/swid+cbor		application/swid+cbor	258	RFC 9393
application/pkixcmp		application/pkixcmp	259	RFC 9482; RFC 9811
application/yang-sid+json		application/yang-sid+json	260	RFC 9595
application/ace-groupcomm+cbor		application/ace-groupcomm+cbor	261	RFC 9594
application/ace-trl+cbor		application/ace-trl+cbor	262	RFC 9770
application/eat+cwt		application/eat+cwt	263	RFC 9782
application/eat+jwt		application/eat+jwt	264	RFC 9782
application/eat-bun+cbor		application/eat-bun+cbor	265	RFC 9782
application/eat-bun+json		application/eat-bun+json	266	RFC 9782
application/eat-ucs+cbor		application/eat-ucs+cbor	267	RFC 9782
application/eat-ucs+json		application/eat-ucs+json	268	RFC 9782
application/coap-eap		application/coap-eap	269	RFC 9820
application/suit-report+cose		application/suit-report+cose	270	RFC-ietf-suit-report-19
application/dots+cbor		application/dots+cbor	271	RFC 9132
application/missing-blocks+cbor-seq		application/missing-blocks+cbor-seq	272	RFC 9177
application/cmw+cbor		application/cmw+cbor	273	RFC 9999, Section 3.1, 3.2, 3.3
application/cmw+json		application/cmw+json	274	RFC 9999, Section 3.1, 3.3
application/cmw+cose		application/cmw+cose	275	RFC 9999, Section 4.1
application/cmw+jws		application/cmw+jws	276	RFC 9999, Section 4.2
application/scitt-statement+cose		application/scitt-statement+cose	277	RFC 9943
application/scitt-receipt+cose		application/scitt-receipt+cose	278	RFC 9943
application/statuslist+cwt		application/statuslist+cwt	279	RFC-ietf-oauth-status-list-21
application/pkcs7-mime; smime-type=server-generated-key		application/pkcs7-mime	280	RFC 7030; RFC 8551; RFC 9148
application/pkcs7-mime; smime-type=certs-only		application/pkcs7-mime	281	RFC 8551; RFC 9148
Unassigned			282-283
application/pkcs8		application/pkcs8	284	RFC 5958; RFC 8551; RFC 9148
application/csrattrs		application/csrattrs	285	RFC 7030; RFC 9148
application/pkcs10		application/pkcs10	286	RFC 5967; RFC 8551; RFC 9148
application/pkix-cert		application/pkix-cert	287	RFC 2585; RFC 9148
Unassigned			288-289
application/aif+cbor		application/aif+cbor	290	RFC 9237
application/aif+json		application/aif+json	291	RFC 9237
application/aif+cbor;toid=CRI-local-part		application/aif+cbor	292	RFC-ietf-core-href-29
application/sd-cwt (TEMPORARY - registered 2025-12-08, expires 2026-12-08)		Provisional Standard Media Type Registry	293	draft-ietf-spice-sd-cwt-06, Section 5
application/kb+cwt (TEMPORARY - registered 2025-12-08, expires 2026-12-08)		Provisional Standard Media Type Registry	294	draft-ietf-spice-sd-cwt-06, Section 8.1
application/measured-component+cbor		application/measured-component+cbor	295	RFC 10013
application/measured-component+json		application/measured-component+json	296	RFC 10013
application/aif+cbor;toid=oscore-gname;tperm=oscore-gperm		application/aif+cbor	297	RFC-ietf-ace-key-groupcomm-oscore-21
application/aif+json;toid=oscore-gname;tperm=oscore-gperm		application/aif+json	298	RFC-ietf-ace-key-groupcomm-oscore-21
application/cose-c509-cert+cbor		application/cose-c509-cert+cbor	299	RFC-ietf-cose-cbor-encoded-cert-20
application/cose-c509+cbor		application/cose-c509+cbor	300	RFC-ietf-cose-cbor-encoded-cert-20
application/cose-c509+cbor;usage=chain		application/cose-c509+cbor	301	RFC-ietf-cose-cbor-encoded-cert-20
application/cose-c509-pkcs10+cbor		application/cose-c509-pkcs10+cbor	302	RFC-ietf-cose-cbor-encoded-cert-20
application/cose-c509-crtemplate+cbor		application/cose-c509-crtemplate+cbor	303	RFC-ietf-cose-cbor-encoded-cert-20
application/cose-c509-privkey+cbor		application/cose-c509-privkey+cbor	304	RFC-ietf-cose-cbor-encoded-cert-20
application/cose-c509-pem+cbor		application/cose-c509-pem+cbor	305	RFC-ietf-cose-cbor-encoded-cert-20
application/cose-certhash+cbor		application/cose-certhash+cbor	306	RFC-ietf-cose-cbor-encoded-cert-20
application/cose-certhash+cbor;usage=c509		application/cose-certhash+cbor	307	RFC-ietf-cose-cbor-encoded-cert-20
Unassigned			308-309
application/senml+xml		application/senml+xml	310	RFC 8428
application/sensml+xml		application/sensml+xml	311	RFC 8428
Unassigned			312-319
application/senml-etch+json		application/senml-etch+json	320	RFC 8790
Unassigned			321
application/senml-etch+cbor		application/senml-etch+cbor	322	RFC 8790
Unassigned			323-339
application/yang-data+cbor		application/yang-data+cbor	340	RFC 9254
application/yang-data+cbor; id=name		application/yang-data+cbor	341	RFC 9254
Unassigned			342-431
application/td+json		application/td+json	432	"Web of Things (WoT) Thing Description 1.1", April 2022
application/tm+json		application/tm+json	433	"Web of Things (WoT) Thing Description 1.1", April 2022
application/sdf+json		application/sdf+json	434	RFC 9880
Unassigned			435-552
application/dns-message		application/dns-message	553	RFC 8484; RFC 9953, Section 4.1
Unassigned			554-600
application/uccs+cbor		application/uccs+cbor	601	RFC 9781, Section 6.4
Unassigned			602-835
application/voucher+cose (TEMPORARY - registered 2022-04-12, extension registered 2026-03-18, expires 2027-04-12)		Provisional Standard Media Type Registry	836	draft-ietf-anima-constrained-voucher-23
Unassigned			837-1541
Reserved, do not use			1542-1543	OMA-TS-LightweightM2M-V1_0
Unassigned			1544-9999
application/vnd.ocf+cbor		application/vnd.ocf+cbor	10000	Michael Koster
application/oscore		application/oscore	10001	RFC 8613
application/javascript		application/javascript	10002	RFC 4329
application/eat+cwt; eat_profile="tag:psacertified.org,2023:psa#tfm"		application/eat+cwt	10003	RFC 9783
application/eat+cwt; eat_profile="tag:psacertified.org,2019:psa#legacy"		application/eat+cwt	10004	RFC 9783
application/eat+cwt; eat_profile=2.16.840.1.113741.1.16.1		application/eat+cwt	10005	RFC 9782; draft-cds-rats-intel-corim-profile-05
application/vnd.oms.cellular-cose-content+cbor		application/vnd.oms.cellular-cose-content+cbor	10006	OMS-Group e. V.
application/syslog-msg		application/syslog-msg	10007	https://www.iana.org/assignments/media-types/application/syslog-msg
Unassigned			10008-10569
application/toc+cbor		application/toc+cbor	10570	CE-Binding, Section 6.3.1
application/ce+cbor		application/ce+cbor	10571	CE-Binding, Section 6.3.2
application/toc+cbor;profile=2.16.840.1.113741.1.16.1		application/toc+cbor	10572	TCG DICE Concise Evidence Binding for SPDM; draft-cds-rats-intel-corim-profile-05
application/ce+cbor;profile=2.16.840.1.113741.1.16.1		application/ce+cbor	10573	TCG DICE Concise Evidence Binding for SPDM; draft-cds-rats-intel-corim-profile-05
Unassigned			10574-11049
application/json	deflate	application/json	11050	RFC 8259; RFC 9110, Section 8.4.1.2
Unassigned			11051-11059
application/cbor	deflate	application/cbor	11060	RFC 8949; RFC 9110, Section 8.4.1.2
Unassigned			11061-11541
application/vnd.oma.lwm2m+tlv		application/vnd.oma.lwm2m+tlv	11542	OMA-TS-LightweightM2M-V1_0
application/vnd.oma.lwm2m+json		application/vnd.oma.lwm2m+json	11543	OMA-TS-LightweightM2M-V1_0
application/vnd.oma.lwm2m+cbor		application/vnd.oma.lwm2m+cbor	11544	OMA-TS-LightweightM2M-V1_2
Unassigned			11545-11999
text/plain;charset=utf-8	zstd	text/plain	12000	Benjamin Valentin
Unassigned			12001-12040
application/xml	zstd	application/xml	12041	Benjamin Valentin
Unassigned			12042-12049
application/json	zstd	application/json	12050	Benjamin Valentin
Unassigned			12051-19999
text/css		text/css	20000	RFC 2318
application/vnd.as207960.vas.config+jer		application/vnd.as207960.vas.config+jer	20001	AS207960 Cyfyngedig
application/vnd.as207960.vas.config+uper		application/vnd.as207960.vas.config+uper	20002	AS207960 Cyfyngedig
application/vnd.as207960.vas.tap+jer		application/vnd.as207960.vas.tap+jer	20003	AS207960 Cyfyngedig
application/vnd.as207960.vas.tap+uper		application/vnd.as207960.vas.tap+uper	20004	AS207960 Cyfyngedig
Unassigned			20005-29999
image/svg+xml		image/svg+xml	30000	https://www.w3.org/TR/SVG/mimereg.html
Unassigned			30001-64997
Reserved for Documentation			64998-64999	RFC 9876
Reserved for Experimental Use			65000-65535	RFC 7252

CoAP Signaling Codes

Registration Procedure(s)

IETF Review or IESG Approval

Reference

RFC 8323: CoAP (Constrained Application Protocol) over TCP, TLS, and WebSockets

Available Formats

Code	Name	Reference
7.00	Unassigned
7.01	CSM	RFC 8323
7.02	Ping	RFC 8323
7.03	Pong	RFC 8323
7.04	Release	RFC 8323
7.05	Abort	RFC 8323
7.06-7.31	Unassigned

CoAP Signaling Option Numbers

Expert(s)

Bilhanan Silverajan (primary), Klaus Hartke (secondary), Alexander Pelov (secondary)

Reference

RFC 8323: CoAP (Constrained Application Protocol) over TCP, TLS, and WebSockets

Available Formats

Range	Registration Procedures	Note
0-255	IETF Review or IESG Approval	Range applies to Option Number field
256-2047	Specification Required	Range applies to Option Number field
2048-64999	Expert Review	Range applies to Option Number field
65000-65535	Experimental use (no operational use)	Range applies to Option Number field

Applies to	Number	Name	Reference
7.01	2	Max-Message-Size	RFC 8323
7.01	4	Block-Wise-Transfer	RFC 8323
7.01	6	Extended-Token-Length	RFC 8974
7.02, 7.03	2	Custody	RFC 8323
7.04	2	Alternative-Address	RFC 8323
7.04	4	Hold-Off	RFC 8323
7.05	2	Bad-CSM-Option	RFC 8323
7.xx (all)	9	OSCORE	RFC 8613

OSCORE Flag Bits

Registration Procedure(s)

Expert Review

Expert(s)

Francesca Palombini, Göran Selander, Christian Amsüss

Reference

RFC 8613: Object Security for Constrained RESTful Environments (OSCORE)

Available Formats

Bit Position	Name	Description	Reference
0	Reserved		RFC 8613
1	Reserved		RFC 8613
2	Group Flag	For using a Group OSCORE Security Context, set to 1 if the message is protected with the group mode	RFC-ietf-core-oscore-groupcomm-28
3	Kid Context Flag	Set to 1 if kid context is present in the compressed COSE object	RFC 8613
4	Kid Flag	Set to 1 if kid is present in the compressed COSE object	RFC 8613
5-7	Partial IV Length	Encodes the Partial IV length; can have value 0 to 5	RFC 8613
8	Extension-2 Flag	Set to 1 if the OSCORE Option specifies a third byte, which includes the flag bits 16-23	draft-ietf-core-oscore-key-update-03
9-14	Unassigned
15	Nonce Flag	Set to 1 if nonce is present in the compressed COSE object	draft-ietf-core-oscore-key-update-03
16	Extension-3 Flag	Set to 1 if the OSCORE Option specifies a fourth byte, which includes the flag bits 24-31	draft-ietf-core-oscore-key-update-03
17-23	Unassigned
24	Extension-4 Flag	Set to 1 if the OSCORE Option specifies a fifth byte, which includes the flag bits 32-39	draft-ietf-core-oscore-key-update-03
25-31	Unassigned
32	Extension-5 Flag	Set to 1 if the OSCORE Option specifies a sixth byte, which includes the flag bits 40-47	draft-ietf-core-oscore-key-update-03
33-39	Unassigned
40	Extension-6 Flag	Set to 1 if the OSCORE Option specifies a seventh byte, which includes the flag bits 48-55	draft-ietf-core-oscore-key-update-03
41-47	Unassigned
48	Extension-7 Flag	Set to 1 if the OSCORE Option specifies a eighth byte, which includes the flag bits 56-63	draft-ietf-core-oscore-key-update-03
49-63	Unassigned

RD Parameters

Registration Procedure(s)

Expert Review

Expert(s)

Carsten Bormann, Jaime Jiménez, Christian Amsüss

Reference

RFC 9176: Constrained RESTful Environments (CoRE) Resource Directory

Note

In accordance with RFC 9423, all entries with the "A" flag set, including new ones, MUST also be registered in the "Target Attributes" registry Constrained RESTful Environments (CoRE) Parameters.

Available Formats

Name	Short	Validity	Use	Description	Reference
Endpoint Name	ep	Unicode*	RLA	Name of the endpoint	RFC 9176
Lifetime	lt	1-4294967295	R	Lifetime of the registration in seconds	RFC 9176
Sector	d	Unicode*	RLA	Sector to which this endpoint belongs	RFC 9176
Registration Base URI	base	URI	RLA	The scheme, address, port, and path at which this server is available	RFC 9176
Page	page	Integer	L	Used for pagination	RFC 9176
Count	count	Integer	L	Used for pagination	RFC 9176
Endpoint Type	et	RFC 9176, Section 9.3.1	RLA	Semantic type of the endpoint (see RFC 9176, Section 9.4)	RFC 9176

Endpoint Type (et=) RD Parameter Values

Expert(s)

Carsten Bormann, Jaime Jiménez, Christian Amsüss

Reference

RFC 9176: Constrained RESTful Environments (CoRE) Resource Directory

Available Formats

Range	Registration Procedures
value starts with "core"	IETF Review
all other values	Specification Required

Value	Description	Reference	Notes
core.rd-group	An application group, as described in RFC 9176, Appendix A.	RFC 9176

Standard Problem Detail Keys

Registration Procedure(s)

Specification Required

Expert(s)

Thomas Fossati, Carsten Bormann

Reference

RFC 9290: Concise Problem Details for Constrained Application Protocol (CoAP) APIs

Available Formats

Key Value	Name	CDDL Type	Brief Description	Change Controller	Reference
-1	title	text / tag38	Short, human-readable summary of the problem shape	IETF (core@ietf.org or art@ietf.org)	RFC 9290
-2	detail	text / tag38	Human-readable explanation specific to this occurrence of the problem	IETF (core@ietf.org or art@ietf.org)	RFC 9290
-3	instance	~uri	URI reference identifying specific occurrence of the problem	IETF (core@ietf.org or art@ietf.org)	RFC 9290
-4	response-code	uint .size 1	CoAP response code	IETF (core@ietf.org or art@ietf.org)	RFC 9290
-5	base-uri	~uri	Base URI	IETF (core@ietf.org or art@ietf.org)	RFC 9290
-6	base-lang	tag38-ltag	Base language tag (see RFC 9290, Appendix A)	IETF (core@ietf.org or art@ietf.org)	RFC 9290
-7	base-rtl	tag38-direction	Base writing direction (see RFC 9290, Appendix A)	IETF (core@ietf.org or art@ietf.org)	RFC 9290
-8	unprocessed-coap-option	one-or-more<uint>	Option number(s) of CoAP option(s) that were not understood	IETF (core@ietf.org or art@ietf.org)	RFC 9290, Section 3.1.1
-25	request-body-error-position	uint	Byte index inside the request body at which the error became apparent	IETF CoRE WG (reverts to IETF after WG closes)	draft-amsuess-core-pd-body-error-position-00

Custom Problem Detail Keys

Registration Procedure(s)

Expert Review

Expert(s)

Thomas Fossati, Carsten Bormann

Reference

RFC 9290: Concise Problem Details for Constrained Application Protocol (CoAP) APIs

Available Formats

Key Value	Name	Brief Description	Change Controller	Reference
0	ace-groupcomm-error	Carry RFC 9594 problem details in a Concise Problem Details data item	IETF	RFC 9594, Section 4.1.2
1	ace-trl-error	Carry RFC 9770 problem details in a Concise Problem Details data item.	IETF	RFC 9770, Section 6.1
7807	tunnel-7807	Carry RFC 7807 problem details in a Concise Problem Details data item	IETF (core@ietf.org or art@ietf.org)	RFC 9290, Appendix B

Target Attributes

Registration Procedure(s)

Expert Review

Expert(s)

Carsten Bormann, Marco Tiloca

Reference

RFC 9423: Constrained RESTful Environments (CoRE) Target Attributes Registry

Available Formats

Attribute Name	Brief Description	Change Controller	Reference
href	reserved (not useful as target attribute name)	IETF	RFC 6690
anchor	reserved (not useful as target attribute name)	IETF	RFC 6690
rel	reserved (not useful as target attribute name)	IETF	RFC 6690
rev	reserved (not useful as target attribute name)	IETF	RFC 6690
hreflang	(Web Linking)	IETF	RFC 8288
media	(Web Linking)	IETF	RFC 8288
title	(Web Linking)	IETF	RFC 8288
type	(Web Linking)	IETF	RFC 8288
rt	resource type	IETF	RFC 6690, Section 3.1
if	interface description	IETF	RFC 6690, Section 3.2
sz	maximum size estimate	IETF	RFC 6690, Section 3.3
ct	Content-Format hint	IETF	RFC 7252, Section 7.2.1
obs	observable resource	IETF	RFC 7641, Section 6
hct	HTTP-CoAP URI mapping template	IETF	RFC 8075, Section 5.5
osc	hint: resource only accessible using OSCORE	IETF	RFC 8613, Section 9
ep	Endpoint Name (with rt="core.rd-ep")	IETF	RFC 9176, Section 9.3
d	Sector (with rt="core.rd-ep")	IETF	RFC 9176, Section 9.3
base	Registration Base URI (with rt="core.rd-ep")	IETF	RFC 9176, Section 9.3
et	Endpoint Type (with rt="core.rd-ep")	IETF	RFC 9176, Section 9.3
ed-i	Hint: support for the EDHOC Initiator role	IETF	RFC 9668
ed-r	Hint: support for the EDHOC Responder role	IETF	RFC 9668
ed-method	A supported authentication method for EDHOC	IETF	RFC 9668
ed-csuite	A supported cipher suite for EDHOC	IETF	RFC 9668
ed-cred-t	A supported type of authentication credential for EDHOC	IETF	RFC 9668
ed-idcred-t	A supported type of authentication credential identifier for EDHOC	IETF	RFC 9668
ed-ead	A supported External Authorization Data (EAD) item for EDHOC	IETF	RFC 9668
ed-comb-req	Hint: support for the EDHOC+OSCORE request	IETF	RFC 9668
gosc	Hint: resource only accessible using Group OSCORE or OSCORE	IETF	RFC-ietf-core-oscore-groupcomm-28, Section 11

Contact Information

Name	Contact URI	Last Updated
AS207960 Cyfyngedig	hello&glauca.digital	2025-10-06
Benjamin Valentin	benjamin.valentin&ml-pa.com	2025-04-22
IETF CoRE WG (reverts to IETF after WG closes)	core&ietf.org
Michael Koster	michael.koster&smartthings.com	2017-07-03