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:

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
acap	674	tcp	ACAP	Chris Newman	Chris Newman		2010-10-15
acap	674	udp	ACAP	Chris Newman	Chris Newman		2010-10-15
proshare-mc-2	1674	tcp	Intel Proshare Multicast	Mark Lewis	Mark Lewis
proshare-mc-2	1674	udp	Intel Proshare Multicast	Mark Lewis	Mark Lewis
ewnn	2674	tcp	ewnn	Yasunari Yamashita	Yasunari Yamashita
ewnn	2674	udp	ewnn	Yasunari Yamashita	Yasunari Yamashita
wininstall-ipc	3674	tcp	WinINSTALL IPC Port	Bill Somerville	Bill Somerville	2008-08-13
wininstall-ipc	3674	udp	WinINSTALL IPC Port	Bill Somerville	Bill Somerville	2008-08-13
appiq-mgmt	4674	tcp	AppIQ Agent Management	Phil Abercrombie	Phil Abercrombie	2005-08
appiq-mgmt	4674	udp	AppIQ Agent Management	Phil Abercrombie	Phil Abercrombie	2005-08
hyperscsi-port	5674	tcp	HyperSCSI Port	Data Storage Institute of Singapore	Data Storage Institute of Singapore	2002-02
hyperscsi-port	5674	udp	HyperSCSI Port	Data Storage Institute of Singapore	Data Storage Institute of Singapore	2002-02
	6674-6677		Unassigned
imqtunnels	7674	tcp	iMQ SSL tunnel	Shailesh S. Bavadekar	Shailesh S. Bavadekar	2002-04
imqtunnels	7674	udp	iMQ SSL tunnel	Shailesh S. Bavadekar	Shailesh S. Bavadekar	2002-04
	8669-8674		Unassigned

Contact Information

Name	Organization	Contact URI	Last Updated
Bill Somerville		Bill.Somerville&scalable.com	2008-08-13
Chris Newman		chris.newman&oracle.com	2017-01-26
	Data Storage Institute of Singapore	Patrick&dsi.nus.edu.sg	2002-02
Mark Lewis		Mark_Lewis&ccm.jf.intel.com
Phil Abercrombie		phil.abercrombie&appiq.com	2005-08
Shailesh S. Bavadekar		shailesh.bavadekar&sun.com	2002-04
Yasunari Yamashita		yamasita&omronsoft.co.jp	2003-04