Service Name and Transport Protocol Port Number Registry

Last Updated

  • 2026-10-15

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
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.
nms 1429 tcp Hypercom NMS
nms 1429 udp Hypercom NMS
ft-role 2429 tcp FT-ROLE Doug Boone Doug Boone
ft-role 2429 udp FT-ROLE Doug Boone Doug Boone
gcsp 3429 tcp GCSP user port Anirban Majumder Anirban Majumder 2002-03
gcsp 3429 udp GCSP user port Anirban Majumder Anirban Majumder 2002-03
vrml-multi-use 4200-4299 VRML Multi User Systems Mitra Mitra
omviagent 4429 tcp OMV Investigation Agent-Server Serge Vacquier Serge Vacquier 2009-05-20
4429 udp Reserved
base 5429 tcp Billing and Accounting System Exchange Odo Maletzki Odo Maletzki
base 5429 udp Billing and Accounting System Exchange Odo Maletzki Odo Maletzki
opi-sock 7429 tcp OpenView DM rqt communication Dave Lamb Dave Lamb
opi-sock 7429 udp OpenView DM rqt communication Dave Lamb Dave Lamb
11372-11429 Unassigned
42511-42998 Unassigned
curiosity 42999 tcp API endpoint for search application Curiosity GmbH Rafael Fernandes de Oliveira 2022-12-09
42999 udp Reserved

Contact Information

Name Organization Contact URI Last Updated
Anirban Majumder majumderanirban&lycos.com 2002-03
Curiosity GmbH hello&curiosity.ai 2022-12-09
Dave Lamb rdl&rdl.cnd.hp.com
Doug Boone dboone&atg.clr.com
Florence Wyman wyman&peabody.plk.af.mil
Mitra mitra&earth.path.net
Odo Maletzki Odo.Maletzki&ioag.de
Rafael Fernandes de Oliveira rafael&curiosity.ai 2022-12-09
Serge Vacquier svacquier&axway.com 2019-03-29