Service Name and Transport Protocol Port Number Registry
Last Updated
- 2026-11-10
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 |
|---|---|---|---|---|---|---|---|---|---|---|---|
| windream | 534 | tcp | windream Admin | Uwe Honermann | Uwe Honermann | ||||||
| windream | 534 | udp | windream Admin | Uwe Honermann | Uwe Honermann | ||||||
| micromuse-lm | 1534 | tcp | micromuse-lm | Adam Kerrison | Adam Kerrison | ||||||
| micromuse-lm | 1534 | udp | micromuse-lm | Adam Kerrison | Adam Kerrison | ||||||
| combox-web-acc | 2534 | tcp | Combox Web Access | Yochai Cohen | Yochai Cohen | ||||||
| combox-web-acc | 2534 | udp | Combox Web Access | Yochai Cohen | Yochai Cohen | ||||||
| urld-port | 3534 | tcp | URL Daemon Port | Jim Binkley | Jim Binkley | 2002-06 | |||||
| urld-port | 3534 | udp | URL Daemon Port | Jim Binkley | Jim Binkley | 2002-06 | |||||
| 4534 | tcp | Reserved | |||||||||
| armagetronad | 4534 | udp | Armagetron Advanced Game Server | Manuel Moos | Yann Kaiser | 2012-11-02 | |||||
| 5322-5342 | Unassigned | ||||||||||
| kfserver | 5343 | tcp | Sculptor Database Server | Keith Ashman | Keith Ashman | 2005-12 | |||||
| kfserver | 5343 | udp | Sculptor Database Server | Keith Ashman | Keith Ashman | 2005-12 | |||||
| xkotodrcp | 5344 | tcp | xkoto DRCP | Jeff Heisz | Jeff Heisz | 2006-02 | |||||
| xkotodrcp | 5344 | udp | xkoto DRCP | Jeff Heisz | Jeff Heisz | 2006-02 | |||||
| 5345-5348 | Unassigned | ||||||||||
| stuns | 5349 | tcp | Session Traversal Utilities for NAT (STUN) port | IESG | IETF Chair | 2019-03-28 | RFC 8489 | ||||
| stuns | 5349 | udp | STUN over DTLS | IESG | IETF Chair | 2014-07-03 | RFC 7350 | This service name was initially created by RFC 5389. | |||
| turns | 5349 | tcp | TURN over TLS | 2019-08-02 | RFC 8656 | ||||||
| turns | 5349 | udp | TURN over DTLS | IESG | IETF Chair | 2019-08-02 | RFC 7350 | This service name was initially created by RFC 8656. | |||
| stun-behaviors | 5349 | tcp | STUN Behavior Discovery over TLS | RFC 5780 | |||||||
| stun-behaviors | 5349 | udp | Reserved for a future enhancement of STUN-BEHAVIOR | RFC 5780 | |||||||
| 9523-9534 | Unassigned | ||||||||||
| 15119-15344 | Unassigned | ||||||||||
| xpilot | 15345 | tcp | XPilot Contact Port | Bert Gijsbers | Bert Gijsbers | ||||||
| xpilot | 15345 | udp | XPilot Contact Port | Bert Gijsbers | Bert Gijsbers | ||||||
| 15346-15362 | Unassigned | ||||||||||
| 33436-33655 | Unassigned | Known Unauthorized Use on ports 33436-33534 |
Contact Information
| Name | Organization | Contact URI | Last Updated |
|---|---|---|---|
| Adam Kerrison | adamµmuse.co.uk | ||
| Bert Gijsbers | bert&xpilot.org | ||
| IESG | iesg&ietf.org | ||
| IETF Chair | IETF | chair&ietf.org | |
| Jeff Heisz | jeff.heisz&xkoto.com | 2006-02 | |
| Jim Binkley | jrb&cs.pdx.edu | 2002-06 | |
| Keith Ashman | sciana&sculptor.co.uk | 2005-12 | |
| Manuel Moos | z-man&users.sf.net | 2012-11-02 | |
| Uwe Honermann | u.honermann&windream.com | ||
| Yann Kaiser | kaiser.yann&gmail.com | 2012-11-02 | |
| Yochai Cohen | yochai&combox.co.il |