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	Unauthorized Use Reported
cisco-tdp	711	tcp	Cisco TDP	Bruce Davie	Bruce Davie
cisco-tdp	711	udp	Cisco TDP	Bruce Davie	Bruce Davie
pptconference	1711	tcp	pptconference	John Tafoya	John Tafoya
pptconference	1711	udp	pptconference	John Tafoya	John Tafoya
sso-control	2711	tcp	SSO Control	Axel Kern	Axel Kern
sso-control	2711	udp	SSO Control	Axel Kern	Axel Kern
edb-server2	3711	tcp	EBD Server 2	Carlos Portela	Carlos Portela	2003-02
edb-server2	3711	udp	EBD Server 2	Carlos Portela	Carlos Portela	2003-02
trinity-dist	4711	tcp	Trinity Trust Network Node Communication	P3KI GmbH	Gregor Jehle	2017-01-12
trinity-dist	4711	udp	Trinity Trust Network Node Communication	P3KI GmbH	Gregor Jehle	2017-01-12
trinity-dist	4711	sctp	Trinity Trust Network Node Communication	P3KI GmbH	Gregor Jehle	2017-01-12
	7108-7116		Unassigned
rothaga	7117	tcp	Encrypted chat and file transfer service	Arcadian Computers	Jonathan Pollock	2016-05-10
	7117	udp	Reserved
	7118-7120		Unassigned
nvc	8711	tcp	Nuance Voice Control	Nuance Communications	Diego Negre	2012-10-05
	8711	udp	Reserved
	11624-11719		Unassigned				Unauthorized Use Known on port 11711

Contact Information

Name	Organization	Contact URI	Last Updated
Arcadian Computers		support&arcadiancomputers.com	2016-05-10
Axel Kern		axel.kern&betasystems.com
Bruce Davie		bsd&cisco.com
Carlos Portela		cportela&simple-sw.com	2003-02
Diego Negre	Nuance Communications	Diego.Negre&nuance.com	2012-10-05
Gregor Jehle		hadez&p3ki.com	2017-01-12
John Tafoya		johnt&microsoft.com
Jonathan Pollock		jon&arcadiancomputers.com	2016-05-10
	Nuance Communications	NOD_SolutionsArchitecture&nuance.com	2012-10-05
	P3KI GmbH	iana&p3ki.com	2017-01-12