Service Name and Transport Protocol Port Number Registry

Last Updated

  • 2026-11-06

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:

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

Available Formats

Service Name Port Number Transport Protocol Description Assignee Contact Registration Date Modification Date Reference Service Code Unauthorized Use Reported Assignment Notes
brutus 2003 tcp Brutus Server Johannes Skov Frandsen Johannes Skov Frandsen 2008-02-28
brutus 2003 udp Brutus Server Johannes Skov Frandsen Johannes Skov Frandsen 2008-02-28
pcmk-remote 3121 tcp The pacemaker remote (pcmk-remote) service extends high availability functionality outside of the Linux cluster into remote nodes. David Vossel Andrew Beekhof 2013-03-15 port 3121 previously noted "Removed on 2003-09-17"
3121 udp Reserved 2013-03-15 port 3121 previously noted "Removed on 2003-09-17"
remotedeploy 3789 tcp RemoteDeploy Administration Port [July 2003] Detlef Rothe Detlef Rothe 2009-05-15
remotedeploy 3789 udp RemoteDeploy Administration Port [July 2003] Detlef Rothe Detlef Rothe 2009-05-15
entextmed 12003 tcp IBM Enterprise Extender SNA COS Medium Priority Eugene Cox Eugene Cox
entextmed 12003 udp IBM Enterprise Extender SNA COS Medium Priority Eugene Cox Eugene Cox
20015-20033 Unassigned
nburn-id 20034 tcp NetBurner ID Port

IANA assigned this well-formed service name as a replacement for "nburn_id".		 Paul Breed Paul Breed 2003-11
nburn_id 20034 tcp NetBurner ID Port Paul Breed Paul Breed 2003-11 This entry is an alias to "nburn-id". This entry is now historic, not usable for use with many common service discovery mechanisms.
nburn-id 20034 udp NetBurner ID Port

IANA assigned this well-formed service name as a replacement for "nburn_id".		 Paul Breed Paul Breed 2003-11
nburn_id 20034 udp NetBurner ID Port Paul Breed Paul Breed 2003-11 This entry is an alias to "nburn-id". This entry is now historic, not usable for use with many common service discovery mechanisms.
20035-20045 Unassigned
optohost003 22003 tcp Opto Host Port 3 Doug Leany Doug Leany 2006-09
optohost003 22003 udp Opto Host Port 3 Doug Leany Doug Leany 2006-09

Contact Information

Name Contact URI Last Updated
Andrew Beekhof andrew&beekhof.net 2013-03-15
David Vossel dvossel&redhat.com 2013-03-15
Detlef Rothe detlef.rothe&ts.fujitsu.com 2009-05-15
Doug Leany DLEANY&opto22.com 2006-09
Eugene Cox genecox&raleigh.ibm.com
Johannes Skov Frandsen joe&42tools.com 2008-02-28
Paul Breed paul&netburner.com 2003-11