Service Name and Transport Protocol Port Number Registry

Last Updated

2025-05-02

Expert(s)

TCP/UDP: Joe Touch; Eliot Lear, Kumiko Ono, 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.                                                   *
************************************************************************

Request an Assignment

  [https://www.iana.org/protocols/apply]

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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
wot		tcp	W3C WoT Thing Description or Directory	[W3C_Web_of_Things_Working_Group]	[Kazuyuki_Ashimura]	2022-11-22	2022-12-15				Defined TXT keys: td: Absolute pathname of the Thing Description of the Thing or Thing Description of the Thing Description Directory. type: Type of the Thing Description, i.e. "Thing" or "Directory". If omitted, the type is assumed to be Thing. scheme: Scheme part of URL. One of the following values can be specified, with the standard registered URI interpretations [RFC7595]: http (HTTP over TCP),https (HTTP over TLS/TCP), coap+tcp (CoAP over TCP), or coaps+tcp (CoAP over TLS/TCP). If omitted, the scheme is assumed to be http.
wot		udp	W3C WoT Thing Description or Directory	[W3C_Web_of_Things_Working_Group]	[Kazuyuki_Ashimura]	2022-11-22	2022-12-15				Defined TXT keys: td: Absolute pathname of the Thing Description of the Thing or Thing Description of the Thing Description Directory. type: Type of the Thing Description, i.e. "Thing" or "Directory". If omitted, the type is assumed to be Thing. scheme: Scheme part of URL. One of the following values can be specified, with the standard registered URI interpretations [RFC7595]: coap (CoAP over UDP), coaps CoAP over DTLS/UDP. If omitted, the scheme is assumed to be coap.

Service Name

Port Number

Transport Protocol

Description

Assignee

Contact

Registration Date

Modification Date

Reference

Service Code

Unauthorized Use Reported

Assignment Notes

wot

tcp

W3C WoT Thing Description or Directory

[W3C_Web_of_Things_Working_Group]

[Kazuyuki_Ashimura]

2022-11-22

2022-12-15

Defined TXT keys:

td: Absolute pathname of the Thing Description of the Thing or Thing Description of the Thing Description Directory.

type: Type of the Thing Description, i.e. "Thing" or "Directory". If omitted, the type is assumed to be Thing.

scheme: Scheme part of URL. One of the following values can be specified, with the standard registered URI interpretations [RFC7595]: http (HTTP over TCP),https (HTTP over TLS/TCP), coap+tcp (CoAP over TCP), or coaps+tcp (CoAP over TLS/TCP). If omitted, the scheme is assumed to be http.

wot

udp