Bundle Protocol

Created

2011-03-24

Last Updated

2026-09-15

Available Formats

Bundle Block Types

Registration Procedure(s)

Specification Required

Expert(s)

Scott Burleigh, Fred Templin

Reference

RFC 6255: Delay-Tolerant Networking Bundle Protocol IANA Registries
RFC 9171: Bundle Protocol Version 7

Available Formats

CSV

Bundle Protocol Version	Value	Description	Reference
none	0	Reserved	RFC 6255
6,7	1	Bundle Payload Block	RFC 5050; RFC 9171
6	2	Bundle Authentication Block	RFC 6257
6	3	Payload Integrity Block	RFC 6257
6	4	Payload Confidentiality Block	RFC 6257
6	5	Previous-Hop Insertion Block	RFC 6259
7	6	Previous node (proximate sender)	RFC 9171
7	7	Bundle age (in milliseconds)	RFC 9171
6	8	Metadata Extension Block	RFC 6258
6	9	Extension Security Block	RFC 6257
7	10	Hop count (#prior xmit attempts)	RFC 9171
7	11	Block Integrity	RFC 9172
7	12	Block Confidentiality	RFC 9172
7	13	Custody Transfer Extension Block	CCSDS 734.6-O-1
7	14	Compressed Status Reporting Extension Block	CCSDS 734.6-O-1
7	15	Quality of Service Extension Block	CCSDS 734.4-O-1
7	16-191	Unassigned
6,7	192-255	Reserved for Private and/or Experimental Use	RFC 5050; RFC 9171

Primary Bundle Protocol Version

Registration Procedure(s)

RFC Required

Reference

RFC 6255: Delay-Tolerant Networking Bundle Protocol IANA Registries

Available Formats

CSV

Value	Description	Reference
0-5	Reserved	RFC 6255
6	Assigned	RFC 5050
7	Assigned	RFC 9171
8-255	Unassigned

Bundle Processing Control Flags

Registration Procedure(s)

Specification Required

Expert(s)

Scott Burleigh, Fred Templin

Reference

RFC 6255: Delay-Tolerant Networking Bundle Protocol IANA Registries
RFC 9171: Bundle Protocol Version 7

Available Formats

CSV

Bundle Protocol Version	Bit Position (right to left)	Description	Reference
6,7	0	Bundle is a fragment	RFC 5050; RFC 9171
6,7	1	ADU is an administrative record	RFC 5050; RFC 9171
6,7	2	Bundle must not be fragmented	RFC 5050; RFC 9171
6	3	Custody transfer is requested	RFC 5050
6	4	Destination endpoint is a singleton	RFC 5050
6,7	5	Acknowledgement by application is requested	RFC 5050; RFC 9171
7	6	Status time requested in reports	RFC 9171
6	7-8	Class of service: priority	RFC 5050
6	9-13	Class of service: reserved	RFC 5050
6,7	14	Request reporting of bundle reception	RFC 5050; RFC 9171
6	15	Request reporting of custody acceptance	RFC 5050
6,7	16	Request reporting of bundle forwarding	RFC 5050; RFC 9171
6,7	17	Request reporting of bundle delivery	RFC 5050; RFC 9171
6,7	18	Request reporting of bundle deletion	RFC 5050; RFC 9171
6,7	19	Reserved	RFC 5050; RFC 9171
6,7	20	Reserved	RFC 5050; RFC 9171
	21-63	Unassigned

Block Processing Control Flags

Registration Procedure(s)

Specification Required

Expert(s)

Scott Burleigh, Fred Templin

Reference

RFC 6255: Delay-Tolerant Networking Bundle Protocol IANA Registries
RFC 9171: Bundle Protocol Version 7

Available Formats

CSV

Bundle Protocol Version	Bit Position (right to left)	Description	Reference
6,7	0	Block must be replicated in every fragment	RFC 5050; RFC 9171
6,7	1	Transmit status report if block can't be processed	RFC 5050; RFC 9171
6,7	2	Delete bundle if block can't be processed	RFC 5050; RFC 9171
6	3	Last block	RFC 5050
6,7	4	Discard block if it can't be processed	RFC 5050; RFC 9171
6	5	Block was forwarded without being processed	RFC 5050
6	6	Block contains an EID-reference field	RFC 5050
	7-63	Unassigned

Bundle Status Report Flags

Registration Procedure(s)

RFC Required

Reference

RFC 6255: Delay-Tolerant Networking Bundle Protocol IANA Registries

Available Formats

CSV

Value	Description	Reference
00000000	Reserved	RFC 6255
00000001	Reporting node received bundle	RFC 5050
00000010	Reporting node accepted custody of bundle	RFC 5050
00000100	Reporting node forwarded the bundle	RFC 5050
00001000	Reporting node delivered the bundle	RFC 5050
00010000	Reporting node deleted the bundle	RFC 5050
00100000	Unassigned
01000000	Unassigned
10000000	Unassigned

Bundle Status Report Reason Codes

Registration Procedure(s)

Specification Required

Expert(s)

Scott Burleigh, Fred Templin

Reference

RFC 6255: Delay-Tolerant Networking Bundle Protocol IANA Registries
RFC 9171: Bundle Protocol Version 7

Available Formats

CSV

Bundle Protocol Version	Value	Description	Reference
6,7	0	No additional information	RFC 5050; RFC 9171
6,7	1	Lifetime expired	RFC 5050; RFC 9171
6,7	2	Forwarded over unidirectional link	RFC 5050; RFC 9171
6,7	3	Transmission canceled	RFC 5050; RFC 9171
6,7	4	Depleted storage	RFC 5050; RFC 9171
6,7	5	Destination endpoint ID unavailable	RFC 5050; RFC 9171
6,7	6	No known route to destination from here	RFC 5050; RFC 9171
6,7	7	No timely contact with next node on route	RFC 5050; RFC 9171
6,7	8	Block unintelligible	RFC 5050; RFC 9171
7	9	Hop limit exceeded	RFC 9171
7	10	Traffic pared	RFC 9171
7	11	Block unsupported	RFC 9171
7	12	Missing security operation	RFC 9172
7	13	Unknown security operation	RFC 9172
7	14	Unexpected security operation	RFC 9172
7	15	Failed security operation	RFC 9172
7	16	Conflicting security operation	RFC 9172
	17-254	Unassigned
6,7	255	Reserved	RFC 6255; RFC 9171

Bundle Custody Signal Reason Codes

Registration Procedure(s)

Specification Required

Expert(s)

Scott Burleigh, Fred Templin

Reference

RFC 6255: Delay-Tolerant Networking Bundle Protocol IANA Registries

Available Formats

CSV

Value	Description	Reference
0	No additional information	RFC 5050
1-2	Unassigned
3	Redundant reception (reception by a node that is a custodial node for this bundle)	RFC 5050
4	Depleted storage	RFC 5050
5	Destination endpoint ID unintelligible	RFC 5050
6	No known route to destination from here	RFC 5050
7	No timely contact with next node on route	RFC 5050
8	Block unintelligible	RFC 5050
9-126	Unassigned
127	Reserved	RFC 6255

Bundle Metadata Type Codes

Registration Procedure(s)

Specification Required

Expert(s)

Rick Taylor

Reference

RFC 6258: Delay-Tolerant Networking Metadata Extension Block

Available Formats

CSV

Value	Description	Reference
0	Reserved	RFC 6258
1	URI	RFC 6258
2-191	Unassigned
192-255	Private and/or Experimental Use	RFC 6258

Ciphersuite Numbers

Registration Procedure(s)

Specification Required

Expert(s)

Stephen Farrell, Edward Birrane

Reference

RFC 6257: Bundle Security Protocol Specification

Available Formats

CSV

Value	Description	Reference
0	Unassigned
1	BAB-HMAC	RFC 6257
2	PIB-RSA-SHA256	RFC 6257
3	PCB-RSA-AES128-PAYLOAD-PIB-PCB	RFC 6257
4	ESB-RSA-AES128-EXT	RFC 6257
values greater than 4	Reserved	RFC 6257

Ciphersuite Flags

Registration Procedure(s)

Specification Required

Expert(s)

Stephen Farrell, Edward Birrane

Reference

RFC 6257: Bundle Security Protocol Specification

Available Formats

CSV

Bit Position (right to left)	Description	Reference
0	Block contains results	RFC 6257
1	Block contains correlator	RFC 6257
2	Block contains parameters	RFC 6257
3	Destination EIDref present	RFC 6257
4	Source EIDref present	RFC 6257
values greater than 4	Reserved	RFC 6257

Ciphersuite Parameters and Results Type Registry

Registration Procedure(s)

Specification Required

Expert(s)

Stephen Farrell, Edward Birrane

Reference

RFC 6257: Bundle Security Protocol Specification

Available Formats

CSV

Value	Description	Reference
0	Reserved	RFC 6257
1	initialization vector (IV)	RFC 6257
2	reserved	RFC 6257
3	key-information	RFC 6257
4	fragment-range (pair of SDNVs)	RFC 6257
5	integrity signature	RFC 6257
6	unassigned
7	salt	RFC 6257
8	PCB integrity check value (ICV)	RFC 6257
9	reserved	RFC 6257
10	encapsulated block	RFC 6257
11	block type of encapsulated block	RFC 6257
12-191	reserved	RFC 6257
192-250	private use	RFC 6257
251-255	reserved	RFC 6257

Bundle Administrative Record Types

Registration Procedure(s)

Specification Required

Expert(s)

Marc Blanchet, Keith Scott

Reference

RFC 7116: Licklider Transmission Protocol (LTP), Compressed Bundle Header Encoding (CBHE), and Bundle Protocol IANA Registries
RFC 9713: Bundle Protocol Version 7 Administrative Record Types Registry

Available Formats

CSV

Bundle Protocol Version	Value	Description	Reference
6,7	0	Reserved	RFC 7116; RFC 9713
6,7	1	Bundle status report	RFC 5050; RFC 9171
6	2	Custody signal	RFC 5050
	3	Unassigned
6	4	Aggregate Custody Signal	CCSDS-BP
	5-12	Unassigned
7	13	Compressed Custody Signal	CCSDS-734.6-O-1
7	14	Compressed Reporting Signal	CCSDS-734.6-O-1
	15	Unassigned
7	16-254	Unassigned
7	255	ACME Node ID Validation	RFC 9891
7	256-64383	Unassigned
7	64384-64511	Reserved for Experimental Use	RFC 9713
7	64512-65535	Reserved for Private Use	RFC 9713

CBHE Node Numbers

Reference

RFC 7116: Licklider Transmission Protocol (LTP), Compressed Bundle Header Encoding (CBHE), and Bundle Protocol IANA Registries
RFC 9758: Updates to the 'ipn' URI Scheme

Note

Renamed "'ipn' Scheme URI Default Allocator Node Numbers" and moved to Uniform Resource Identifier (URI) Schemes per RFC 9758.

CBHE Service Numbers

Expert(s)

Marc Blanchet, Keith Scott

Reference

RFC 7116: Licklider Transmission Protocol (LTP), Compressed Bundle Header Encoding (CBHE), and Bundle Protocol IANA Registries

Available Formats

CSV

Range	Registration Procedures
0-63	Specification Required
1024-65535	Specification Required

Value	Description	Reference
0	Bundle Protocol Administrative Record	RFC 6260
1	CCSDS File Delivery Service	CCSDS 727.0-B-4
2	Reserved	RFC 7116
3-63	Unassigned
64-1023	Allocated to the Space Assigned Numbers Authority (SANA) for use by Consultative Committee for Space Data Systems (CCSDS) missions.	RFC 7116
1024-65535	Unassigned
>=65535	Reserved for Private or Experimental Use	RFC 7116

Bundle Protocol TCP Convergence-Layer Version Numbers

Registration Procedure(s)

RFC Required

Reference

RFC 7242: Delay-Tolerant Networking TCP Convergence-Layer Protocol

Available Formats

CSV

Value	Description	Reference
0	Reserved	RFC 7242
1	Reserved	RFC 7242
2	Reserved	RFC 7242
3	TCPCL	RFC 7242
4	TCPCLv4	RFC 9174
5-255	Unassigned

Bundle Protocol TCP Convergence-Layer Message Types

Registration Procedure(s)

RFC Required

Reference

RFC 7242: Delay-Tolerant Networking TCP Convergence-Layer Protocol

Available Formats

CSV

Type	Code	Description	Reference
	0x0	Reserved	RFC 7242
DATA_SEGMENT	0x1	Indicates the transmission of a segment of bundle data, as described in Section 5.2.	RFC 7242
ACK_SEGMENT	0x2	Acknowledges reception of a data segment, as described in Section 5.3.	RFC 7242
REFUSE_BUNDLE	0x3	Indicates that the transmission of the current bundle shall be stopped, as described in Section 5.4.	RFC 7242
KEEPALIVE	0x4	KEEPALIVE message for the connection, as described in Section 5.6.	RFC 7242
SHUTDOWN	0x5	Indicates that one of the nodes participating in the connection wishes to cleanly terminate the connection, as described in Section 6.	RFC 7242
LENGTH	0x6	Contains the length (in bytes) of the next bundle, as described in Section 5.5.	RFC 7242
	0x7-0xf	Unassigned

Bundle Protocol TCP Convergence-Layer REFUSE_BUNDLE Reason Codes

Registration Procedure(s)

RFC Required

Reference

RFC 7242: Delay-Tolerant Networking TCP Convergence-Layer Protocol

Available Formats

CSV

RCode	Semantics	Reference
0x0	Reason for refusal is unknown or not specified.	RFC 7242
0x1	The receiver now has the complete bundle. The sender may now consider the bundle as completely received.	RFC 7242
0x2	The receiver's resources are exhausted. The sender SHOULD apply reactive bundle fragmentation before retrying.	RFC 7242
0x3	The receiver has encountered a problem that requires the bundle to be retransmitted in its entirety.	RFC 7242
0x4-0x7	Unassigned
0x8-0xf	Reserved for future usage.	RFC 7242

Bundle Protocol TCP Convergence-Layer SHUTDOWN Reason Codes

Registration Procedure(s)

RFC Required

Reference

RFC 7242: Delay-Tolerant Networking TCP Convergence-Layer Protocol

Available Formats

CSV

Code	Meaning	Description	Reference
0x00	Idle timeout	The connection is being closed due to idleness.	RFC 7242
0x01	Version mismatch	The node cannot conform to the specified TCPCL protocol version.	RFC 7242
0x02	Busy	The node is too busy to handle the current connection.	RFC 7242
0x03-0xff		Unassigned

Bundle Protocol TCP Convergence-Layer Version 4 Session Extension Types

Registration Procedure(s)

Expert Review

Expert(s)

Brian Sipos, Rick Taylor

Reference

RFC 9174: Delay-Tolerant Networking TCP Convergence-Layer Protocol Version 4

Available Formats

CSV

Code	Session Extension Type	Reference
0x0000	Reserved	RFC 9174
0x0001-0x7FFF	Unassigned
0x8000-0xFFFF	Reserved for Private or Experimental Use	RFC 9174

Bundle Protocol TCP Convergence-Layer Version 4 Transfer Extension Types

Registration Procedure(s)

Expert Review

Expert(s)

Brian Sipos, Rick Taylor

Reference

RFC 9174: Delay-Tolerant Networking TCP Convergence-Layer Protocol Version 4

Available Formats

CSV

Code	Transfer Extension Type	Reference
0x0000	Reserved	RFC 9174
0x0001	Transfer Length Extension	RFC 9174
0x0002-0x7FFF	Unassigned
0x8000-0xFFFF	Reserved for Private or Experimental Use	RFC 9174

Bundle Protocol TCP Convergence-Layer Version 4 Message Types

Registration Procedure(s)

RFC Required

Reference

RFC 9174: Delay-Tolerant Networking TCP Convergence-Layer Protocol Version 4

Available Formats

CSV

Code	Message Type	Reference
0x00	Reserved	RFC 9174
0x01	XFER_SEGMENT	RFC 9174
0x02	XFER_ACK	RFC 9174
0x03	XFER_REFUSE	RFC 9174
0x04	KEEPALIVE	RFC 9174
0x05	SESS_TERM	RFC 9174
0x06	MSG_REJECT	RFC 9174
0x07	SESS_INIT	RFC 9174
0x08-0xEF	Unassigned
0xF0-0xFF	Reserved for Private or Experimental Use	RFC 9174

Bundle Protocol TCP Convergence-Layer Version 4 XFER_REFUSE Reason Codes

Registration Procedure(s)

Specification Required

Expert(s)

Brian Sipos, Rick Taylor

Reference

RFC 9174: Delay-Tolerant Networking TCP Convergence-Layer Protocol Version 4

Available Formats

CSV

Code	Refusal Reason	Reference
0x00	Unknown	RFC 9174
0x01	Completed	RFC 9174
0x02	No Resources	RFC 9174
0x03	Retransmit	RFC 9174
0x04	Not Acceptable	RFC 9174
0x05	Extension Failure	RFC 9174
0x06	Session Terminating	RFC 9174
0x07-0xEF	Unassigned
0xF0-0xFF	Reserved for Private or Experimental Use	RFC 9174

Bundle Protocol TCP Convergence-Layer Version 4 SESS_TERM Reason Codes

Registration Procedure(s)

Specification Required

Expert(s)

Brian Sipos, Rick Taylor

Reference

RFC 9174: Delay-Tolerant Networking TCP Convergence-Layer Protocol Version 4

Available Formats

CSV

Code	Termination Reason	Reference
0x00	Unknown	RFC 9174
0x01	Idle timeout	RFC 9174
0x02	Version mismatch	RFC 9174
0x03	Busy	RFC 9174
0x04	Contact Failure	RFC 9174
0x05	Resource Exhaustion	RFC 9174
0x06-0xEF	Unassigned
0xF0-0xFF	Reserved for Private or Experimental Use	RFC 9174

Bundle Protocol TCP Convergence-Layer Version 4 MSG_REJECT Reason Codes

Registration Procedure(s)

Specification Required

Expert(s)

Brian Sipos, Rick Taylor

Reference

RFC 9174: Delay-Tolerant Networking TCP Convergence-Layer Protocol Version 4

Available Formats

CSV

Code	Rejection Reason	Reference
0x00	Reserved	RFC 9174
0x01	Message Type Unknown	RFC 9174
0x02	Message Unsupported	RFC 9174
0x03	Message Unexpected	RFC 9174
0x04-0xEF	Unassigned
0xF0-0xFF	Reserved for Private or Experimental Use	RFC 9174

Bundle Protocol URI Scheme Types

Registration Procedure(s)

Standards Action

Reference

RFC 9171: Bundle Protocol Version 7

Available Formats

CSV

Value	Description	BP Utilization Reference	URI Definition Reference
0	Reserved	n/a
1	dtn	RFC 9171	RFC 9171
2	ipn	RFC 9171	RFC 6260; RFC 9171
3-254	Unassigned	n/a
255-65535	Reserved	n/a
>65535	Reserved for Private Use	n/a

BPSec Security Context Identifiers

Registration Procedure(s)

Specification Required

Expert(s)

Ken McKeever, Edward Birrane

Reference

RFC 9172: Bundle Protocol Security (BPSec)

Available Formats

CSV

Value	Description	Reference
-32768 to -1	Reserved	RFC 9172
0	Reserved	RFC 9172
1	BIB-HMAC-SHA2	RFC 9173
2	BCB-AES-GCM	RFC 9173
3	COSE (TEMPORARY - registered 2024-11-12, publication requested 2026-08-24)	draft-ietf-dtn-bpsec-cose-09
4-32767	Unassigned

BPSec BIB-HMAC-SHA2 Integrity Scope Flags

Registration Procedure(s)

Specification Required

Expert(s)

Ken McKeever, Edward Birrane

Reference

RFC 9173: Default Security Contexts for Bundle Protocol Security (BPSec)

Available Formats

CSV

Bit Position (right to left)	Description	Reference
0	Include primary block flag	RFC 9173
1	Include target header flag	RFC 9173
2	Include security header flag	RFC 9173
3-7	Reserved	RFC 9173
8-15	Unassigned

BPSec BCB-AES-GCM AAD Scope Flags

Registration Procedure(s)

Specification Required

Expert(s)

Ken McKeever, Edward Birrane

Reference

RFC 9173: Default Security Contexts for Bundle Protocol Security (BPSec)

Available Formats

CSV

Bit Position (right to left)	Description	Reference
0	Include primary block flag	RFC 9173
1	Include target header flag	RFC 9173
2	Include security header flag	RFC 9173
3-7	Reserved	RFC 9173
8-15	Unassigned

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