Internet Assigned Numbers Authority

Service Name and Transport Protocol Port Number Registry

Last Updated
2022-06-10
Expert(s)
TCP/UDP: Joe Touch; Eliot Lear, Markku Kojo, Kumiko Ono, Martin Stiemerling, 
Wes Eddy, Brian Trammell, Jana Iyengar, and Michael Scharf
SCTP: Michael Tuexen
DCCP: Eddie Kohler and Yoshifumi Nishida
Reference
[RFC6335]
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 process, as
documented in [RFC6335].

Port numbers are assigned in various ways, based on three ranges: System
Ports (0-1023), User Ports (1024-49151), and the Dynamic and/or Private
Ports (49152-65535); the different uses of these ranges are described in
[RFC6335]. According to Section 8.1.2 of [RFC6335], System Ports are 
assigned by the "IETF Review" or "IESG Approval" procedures described in 
[RFC8126]. User Ports are assigned by IANA using the "IETF Review" process, 
the "IESG Approval" process, or the "Expert Review" process, as per 
[RFC6335]. Dynamic Ports are not assigned.

The registration procedures for service names and port numbers are
described in [RFC6335].

Assigned ports both System and User ports SHOULD NOT be used without
or prior to IANA registration.

************************************************************************
* PLEASE NOTE THE FOLLOWING:                                           *
*                                                                      *
* 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.                                                   *
************************************************************************
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Service Name Port Number Transport Protocol Description Assignee Contact Registration Date Modification Date Reference Service Code Unauthorized Use Reported Assignment Notes
0 tcp Reserved [Jon_Postel] [Jon_Postel]
0 udp Reserved [Jon_Postel] [Jon_Postel]
47 tcp Reserved 2017-05-18 This entry has been removed on 2017-05-18.
47 udp Reserved 2017-05-18 This entry has been removed on 2017-05-18.
51 Reserved 2013-05-24 This entry is being removed on 2013-05-24.
61 tcp Reserved 2017-05-18 This entry has been removed on 2017-05-18.
61 udp Reserved 2017-05-18 This entry has been removed on 2017-05-18.
143 udp Reserved 2021-02-22 [RFC9051]
225-241 Reserved [Jon_Postel] [Jon_Postel]
249-255 Reserved [Jon_Postel] [Jon_Postel]
270 tcp Reserved
271 udp Reserved
323 udp Reserved
324 udp Reserved
953 udp Reserved
993 udp Reserved 2021-02-22 [RFC9051]
994 tcp Reserved 2011-08-31 (previous contact was[Christopher_Allen])
994 udp Reserved
1001 udp Reserved
1011-1020 Reserved
1023 tcp Reserved [IANA] [IANA]
1023 udp Reserved [IANA] [IANA]
1024 tcp Reserved [IANA] [IANA]
1024 udp Reserved [IANA] [IANA]
1027 tcp Reserved
1030 Reserved 2013-05-24 This entry is being removed on 2013-05-24.
1031 Reserved 2013-05-24 This entry is being removed on 2013-05-24.
1032 Reserved 2013-05-24 This entry is being removed on 2013-05-24.
1109 Reserved - IANA
1276 tcp Reserved 2014-05-23 This entry has been removed on 2014-05-23.
1276 udp Reserved 2014-05-23 This entry has been removed on 2014-05-23.
1301 tcp Reserved 2019-10-30 De-Assigned on 2019-10-30
1301 udp Reserved 2019-10-30 De-Assigned on 2019-10-30
1302 tcp Reserved 2019-10-30 De-Assigned on 2019-10-30
1302 udp Reserved 2019-10-30 De-Assigned on 2019-10-30
1407 udp Reserved This port has been removed on 2015-06-16.
1753 udp Reserved
1775 udp Reserved
2188 udp Reserved
2189 udp Reserved
2200 tcp Reserved This entry has been removed on 2019-07-05.
2200 udp Reserved This entry has been removed on 2019-07-05.
2225 udp Reserved
2371 udp Reserved 2014-04-09
2373 udp Reserved
2374 udp Reserved
2375 udp Reserved
2377 udp Reserved
2378 tcp Reserved
2379 udp Reserved
2380 udp Reserved
2408 udp Reserved 2012-03-09 This entry is being removed on 2012-03-09.
2855 udp Reserved 2014-04-09
3001 udp Reserved 2013-03-29 port 3001 previously "Removed on 2006-05-25"
3071 udp Reserved 2017-08-24
3097 tcp Reserved
3097 udp Reserved
3121 udp Reserved 2013-03-15 port 3121 previously noted "Removed on 2003-09-17"
3300 udp Reserved
3565 udp Reserved
3566 udp Reserved 2010-10-18
3693 udp Reserved 2014-11-26 This port was previously removed on 2007-04-05.
3737 udp Reserved
3766 udp Reserved this port was previously updated on 2009-06-19
3841 udp Reserved 2003-11 2014-08-22
3864 udp Reserved This entry has been removed on 2006-06-23.
3868 udp Reserved
3980 tcp Reserved 2006-06 2020-12-29 Historic usage was acms. De-Assigned on 2020-12-29
3980 udp Reserved
4077 tcp Reserved
4078 udp Reserved
4084 tcp Reserved
4085 udp Reserved
4086 tcp Reserved
4087 udp Reserved
4088 udp Reserved
4120 udp Reserved
4170 udp Reserved
4171 udp Reserved
4173 tcp Reserved
4175 udp Reserved
4176 udp Reserved
4186 udp Reserved
4187 udp Reserved
4189 udp Reserved [RFC5440]
4190 udp Reserved [RFC5804]
4191 tcp Reserved
4193 udp Reserved
4194 udp Reserved
4311 udp Reserved
4312 udp Reserved
4313 udp Reserved
4314 udp Reserved
4316 udp Reserved
4317 udp Reserved
4324 Reserved 2015-05-12 This entry is being removed on 2015-05-12.
4329 udp Reserved
4330 udp Reserved
4331 udp Reserved
4332 udp Reserved

Contact Information

ID Name Organization Contact URI Last Updated
[Christopher_Allen] Christopher Allen mailto:ChristopherA&consensus.com
[IANA] IANA mailto:iana&iana.org
[Jon_Postel] Jon Postel mailto:postel&isi.edu