Service Name and Transport Protocol Port Number Registry
Last Updated
- 2026-10-13
Expert(s)
- TCP/UDP: Joe Touch; Eliot Lear, Kumiko Ono, Wes Eddy, Brian Trammell, and Michael Scharf
- SCTP: Michael Tuexen
- DCCP: Eddie Kohler and Yoshifumi Nishida
Reference
- RFC 6335: Internet Assigned Numbers Authority (IANA) Procedures for the Management of the Service Name and Transport Protocol Port Number Registry
Note
Service names and port numbers are used to distinguish between different services that run over transport protocols such as TCP, UDP, DCCP, and SCTP.
Service names are assigned on a First Come First Served basis, as described in RFC 6335.
Port numbers are divided into three ranges, with their uses and assignment procedures specified in Section 8.1.2 of RFC 6335:
- System Ports (0-1023) are assigned using the IETF Review or IESG Approval procedures.
- User Ports (1024-49151) are assigned using the IETF Review, IESG Approval, or Expert Review procedures.
- Dynamic and/or Private Ports (49152-65535) are not assigned.
The registration procedures for service names and port numbers are specified in RFC 6335, while the registration policies referenced above are defined in RFC 8126.
Assigned ports both System and User ports SHOULD NOT be used without or prior to IANA registration.
Assignment of a port number does not in any way imply an endorsement of an application or product, and the fact that network traffic is flowing to or from a registered port does not mean that it is "good" traffic, nor that it necessarily corresponds to the assigned service. Firewall and system administrators should choose how to configure their systems based on their knowledge of the traffic in question, not whether there is a port number registered or not.
Registration Forms
- To request a new assignment, please use the Application for Service Names and User Port Numbers form.
- To modify an existing assignment, please use the Modify a Port Number Assignment form.
Available Formats
| Service Name | Port Number | Transport Protocol | Description | Assignee | Contact | Registration Date | Modification Date | Reference | Service Code | Unauthorized Use Reported | Assignment Notes |
|---|---|---|---|---|---|---|---|---|---|---|---|
| ups | 401 | tcp | Uninterruptible Power Supply | Charles Bennett | Charles Bennett | 2008-08-29 | |||||
| ups | 401 | udp | Uninterruptible Power Supply | Charles Bennett | Charles Bennett | 2008-08-29 | |||||
| genie | 402 | tcp | Genie Protocol | Mark Hankin | Mark Hankin | ||||||
| genie | 402 | udp | Genie Protocol | Mark Hankin | Mark Hankin | ||||||
| decap | 403 | tcp | decap | ||||||||
| decap | 403 | udp | decap | ||||||||
| nced | 404 | tcp | nced | ||||||||
| nced | 404 | udp | nced | ||||||||
| ncld | 405 | tcp | ncld | Richard Jones | Richard Jones | ||||||
| ncld | 405 | udp | ncld | Richard Jones | Richard Jones | ||||||
| imsp | 406 | tcp | Interactive Mail Support Protocol | John Myers | John Myers | ||||||
| imsp | 406 | udp | Interactive Mail Support Protocol | John Myers | John Myers | ||||||
| timbuktu | 407 | tcp | Timbuktu | Marc Epard | Marc Epard | ||||||
| timbuktu | 407 | udp | Timbuktu | Marc Epard | Marc Epard | ||||||
| prm-sm | 408 | tcp | Prospero Resource Manager Sys. Man. | ||||||||
| prm-sm | 408 | udp | Prospero Resource Manager Sys. Man. | ||||||||
| prm-nm | 409 | tcp | Prospero Resource Manager Node Man. | B. Clifford Neuman | B. Clifford Neuman | ||||||
| prm-nm | 409 | udp | Prospero Resource Manager Node Man. | B. Clifford Neuman | B. Clifford Neuman | ||||||
| decladebug | 410 | tcp | DECLadebug Remote Debug Protocol | Hewlett Packard | Hewlett Packard | ||||||
| decladebug | 410 | udp | DECLadebug Remote Debug Protocol | Hewlett Packard | Hewlett Packard | ||||||
| rmt | 411 | tcp | Remote MT Protocol | Peter Eriksson | Peter Eriksson | ||||||
| rmt | 411 | udp | Remote MT Protocol | Peter Eriksson | Peter Eriksson | ||||||
| synoptics-trap | 412 | tcp | Trap Convention Port | Illan Raab | Illan Raab | ||||||
| synoptics-trap | 412 | udp | Trap Convention Port | Illan Raab | Illan Raab | ||||||
| smsp | 413 | tcp | Storage Management Services Protocol | Murthy Srinivas | Murthy Srinivas | ||||||
| smsp | 413 | udp | Storage Management Services Protocol | Murthy Srinivas | Murthy Srinivas | ||||||
| infoseek | 414 | tcp | InfoSeek | Steve Kirsch | Steve Kirsch | ||||||
| infoseek | 414 | udp | InfoSeek | Steve Kirsch | Steve Kirsch | ||||||
| bnet | 415 | tcp | BNet | Jim Mertz | Jim Mertz | ||||||
| bnet | 415 | udp | BNet | Jim Mertz | Jim Mertz | ||||||
| silverplatter | 416 | tcp | Silverplatter | Peter Ciuffetti | Peter Ciuffetti | ||||||
| silverplatter | 416 | udp | Silverplatter | Peter Ciuffetti | Peter Ciuffetti | ||||||
| onmux | 417 | tcp | Onmux | Stephen Hanna | Stephen Hanna | ||||||
| onmux | 417 | udp | Onmux | Stephen Hanna | Stephen Hanna | ||||||
| hyper-g | 418 | tcp | Hyper-G | Frank Kappe | Frank Kappe | ||||||
| hyper-g | 418 | udp | Hyper-G | Frank Kappe | Frank Kappe | ||||||
| ariel1 | 419 | tcp | Ariel 1 | Joel Karafin | Joel Karafin | ||||||
| ariel1 | 419 | udp | Ariel 1 | Joel Karafin | Joel Karafin | ||||||
| smpte | 420 | tcp | SMPTE | Si Becker | Si Becker | ||||||
| smpte | 420 | udp | SMPTE | Si Becker | Si Becker | ||||||
| ariel2 | 421 | tcp | Ariel 2 | ||||||||
| ariel2 | 421 | udp | Ariel 2 | ||||||||
| ariel3 | 422 | tcp | Ariel 3 | Joel Karafin | Joel Karafin | ||||||
| ariel3 | 422 | udp | Ariel 3 | Joel Karafin | Joel Karafin | ||||||
| opc-job-start | 423 | tcp | IBM Operations Planning and Control Start | ||||||||
| opc-job-start | 423 | udp | IBM Operations Planning and Control Start | ||||||||
| opc-job-track | 424 | tcp | IBM Operations Planning and Control Track | Conny Larsson | Conny Larsson | ||||||
| opc-job-track | 424 | udp | IBM Operations Planning and Control Track | Conny Larsson | Conny Larsson | ||||||
| icad-el | 425 | tcp | ICAD | Larry Stone | Larry Stone | ||||||
| icad-el | 425 | udp | ICAD | Larry Stone | Larry Stone | ||||||
| smartsdp | 426 | tcp | smartsdp | Marie-Pierre Belanger | Marie-Pierre Belanger | ||||||
| smartsdp | 426 | udp | smartsdp | Marie-Pierre Belanger | Marie-Pierre Belanger | ||||||
| svrloc | 427 | tcp | Server Location | Veizades | Veizades | ||||||
| svrloc | 427 | udp | Server Location | Veizades | Veizades | ||||||
| ocs-cmu | 428 | tcp | OCS_CMU IANA assigned this well-formed service name as a replacement for "ocs_cmu". |
||||||||
| ocs_cmu | 428 | tcp | OCS_CMU | This entry is an alias to "ocs-cmu". This entry is now historic, not usable for use with many common service discovery mechanisms. | |||||||
| ocs-cmu | 428 | udp | OCS_CMU IANA assigned this well-formed service name as a replacement for "ocs_cmu". |
||||||||
| ocs_cmu | 428 | udp | OCS_CMU | This entry is an alias to "ocs-cmu". This entry is now historic, not usable for use with many common service discovery mechanisms. | |||||||
| ocs-amu | 429 | tcp | OCS_AMU IANA assigned this well-formed service name as a replacement for "ocs_amu". |
Florence Wyman | Florence Wyman | ||||||
| ocs_amu | 429 | tcp | OCS_AMU | Florence Wyman | Florence Wyman | This entry is an alias to "ocs-amu". This entry is now historic, not usable for use with many common service discovery mechanisms. | |||||
| ocs-amu | 429 | udp | OCS_AMU IANA assigned this well-formed service name as a replacement for "ocs_amu". |
Florence Wyman | Florence Wyman | ||||||
| ocs_amu | 429 | udp | OCS_AMU | Florence Wyman | Florence Wyman | This entry is an alias to "ocs-amu". This entry is now historic, not usable for use with many common service discovery mechanisms. | |||||
| utmpsd | 430 | tcp | UTMPSD | ||||||||
| utmpsd | 430 | udp | UTMPSD | ||||||||
| utmpcd | 431 | tcp | UTMPCD | ||||||||
| utmpcd | 431 | udp | UTMPCD | ||||||||
| iasd | 432 | tcp | IASD | Nir Baroz | Nir Baroz | ||||||
| iasd | 432 | udp | IASD | Nir Baroz | Nir Baroz | ||||||
| nnsp | 433 | tcp | NNTP for transit servers (NNSP) | IESG | IETF Chair | 2018-07-06 | RFC 3977 | ||||
| nnsp | 433 | udp | NNTP for transit servers (NNSP) | IESG | IETF Chair | 2018-07-06 | RFC 3977 | ||||
| mobileip-agent | 434 | tcp | MobileIP-Agent | ||||||||
| mobileip-agent | 434 | udp | MobileIP-Agent | ||||||||
| mobilip-mn | 435 | tcp | MobilIP-MN | Kannan Alagappan | Kannan Alagappan | ||||||
| mobilip-mn | 435 | udp | MobilIP-MN | Kannan Alagappan | Kannan Alagappan | ||||||
| dna-cml | 436 | tcp | DNA-CML | Dan Flowers | Dan Flowers | ||||||
| dna-cml | 436 | udp | DNA-CML | Dan Flowers | Dan Flowers | ||||||
| comscm | 437 | tcp | comscm | Jim Teague | Jim Teague | ||||||
| comscm | 437 | udp | comscm | Jim Teague | Jim Teague | ||||||
| dsfgw | 438 | tcp | dsfgw | Andy McKeen | Andy McKeen | ||||||
| dsfgw | 438 | udp | dsfgw | Andy McKeen | Andy McKeen | ||||||
| dasp | 439 | tcp | dasp | Thomas Obermair | Thomas Obermair | ||||||
| dasp | 439 | udp | dasp | Thomas Obermair | Thomas Obermair | ||||||
| sgcp | 440 | tcp | sgcp | Marshall Rose | Marshall Rose | ||||||
| sgcp | 440 | udp | sgcp | Marshall Rose | Marshall Rose | ||||||
| decvms-sysmgt | 441 | tcp | decvms-sysmgt | Lee Barton | Lee Barton | ||||||
| decvms-sysmgt | 441 | udp | decvms-sysmgt | Lee Barton | Lee Barton | ||||||
| cvc-hostd | 442 | tcp | cvc_hostd IANA assigned this well-formed service name as a replacement for "cvc_hostd". |
Bill Davidson | Bill Davidson | ||||||
| cvc_hostd | 442 | tcp | cvc_hostd | Bill Davidson | Bill Davidson | This entry is an alias to "cvc-hostd". This entry is now historic, not usable for use with many common service discovery mechanisms. | |||||
| cvc-hostd | 442 | udp | cvc_hostd IANA assigned this well-formed service name as a replacement for "cvc_hostd". |
Bill Davidson | Bill Davidson | ||||||
| cvc_hostd | 442 | udp | cvc_hostd | Bill Davidson | Bill Davidson | This entry is an alias to "cvc-hostd". This entry is now historic, not usable for use with many common service discovery mechanisms. | |||||
| https | 443 | tcp | http protocol over TLS/SSL | IESG | IETF Chair | 2021-10-01 | RFC 9110 | ||||
| https | 443 | udp | http protocol over TLS/SSL | IESG | IETF Chair | 2021-10-01 | RFC 9110 | ||||
| https | 443 | sctp | HTTPS | Randall Stewart | Randall Stewart | 2022-02-07 | RFC 9260 | ||||
| snpp | 444 | tcp | Simple Network Paging Protocol | RFC 1568 | |||||||
| snpp | 444 | udp | Simple Network Paging Protocol | RFC 1568 | |||||||
| microsoft-ds | 445 | tcp | Microsoft-DS | Pradeep Bahl | Pradeep Bahl | ||||||
| microsoft-ds | 445 | udp | Microsoft-DS | Pradeep Bahl | Pradeep Bahl | ||||||
| ddm-rdb | 446 | tcp | DDM-Remote Relational Database Access | ||||||||
| ddm-rdb | 446 | udp | DDM-Remote Relational Database Access | ||||||||
| ddm-dfm | 447 | tcp | DDM-Distributed File Management | Steven Ritland | Steven Ritland | ||||||
| ddm-dfm | 447 | udp | DDM-Distributed File Management | Steven Ritland | Steven Ritland |