What Are Registered Ports For

Service Proper noun and Transport Protocol Port Number Registry

Last Updated

2022-06-x

Skillful(southward)

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 unlike services that run over transport protocols such equally TCP, UDP, DCCP, and SCTP. Service names are assigned on a starting time-come, first-served process, as documented in [RFC6335]. Port numbers are assigned in diverse means, based on 3 ranges: System Ports (0-1023), User Ports (1024-49151), and the Dynamic and/or Individual Ports (49152-65535); the dissimilar uses of these ranges are described in [RFC6335]. According to Section 8.1.2 of [RFC6335], System Ports are assigned past the "IETF Review" or "IESG Blessing" procedures described in [RFC8126]. User Ports are assigned by IANA using the "IETF Review" procedure, the "IESG Approving" procedure, or the "Proficient Review" process, as per [RFC6335]. Dynamic Ports are non 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 Non MEAN THAT * * Information technology IS "Proficient" 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	Ship Protocol	Description	Assignee	Contact	Modification Appointment	Reference	Service Code	Assignment Notes
	0	tcp	Reserved	[Jon_Postel]	[Jon_Postel]
	0	udp	Reserved	[Jon_Postel]	[Jon_Postel]
tcpmux	1	tcp	TCP Port Service Multiplexer	[Mark_Lottor]	[Mark_Lottor]
tcpmux	1	udp	TCP Port Service Multiplexer	[Mark_Lottor]	[Mark_Lottor]
compressnet	2	tcp	Management Utility
compressnet	2	udp	Management Utility
compressnet	three	tcp	Compression Procedure	[Bernie_Volz]	[Bernie_Volz]
compressnet	3	udp	Compression Procedure	[Bernie_Volz]	[Bernie_Volz]
	4	tcp	Unassigned
	four	udp	Unassigned
rje	5	tcp	Remote Chore Entry	[Jon_Postel]	[Jon_Postel]
rje	five	udp	Remote Job Entry	[Jon_Postel]	[Jon_Postel]
	six	tcp	Unassigned
	six	udp	Unassigned
echo	7	tcp	Echo	[Jon_Postel]	[Jon_Postel]
repeat	seven	udp	Echo	[Jon_Postel]	[Jon_Postel]
	8	tcp	Unassigned
	8	udp	Unassigned
discard	ix	tcp	Discard	[Jon_Postel]	[Jon_Postel]
discard	9	udp	Discard	[Jon_Postel]	[Jon_Postel]
discard	9	sctp	Discard	[Randall_Stewart]	[Randall_Stewart]	2022-02-07	[RFC9260]
discard	9	dccp	Discard	[Eddie_Kohler]	[Eddie_Kohler]		[RFC4340]	1145656131
	10	tcp	Unassigned
	10	udp	Unassigned
systat	11	tcp	Active Users	[Jon_Postel]	[Jon_Postel]
systat	11	udp	Agile Users	[Jon_Postel]	[Jon_Postel]
	12	tcp	Unassigned
	12	udp	Unassigned
daytime	thirteen	tcp	Daytime	[Jon_Postel]	[Jon_Postel]		[RFC867]
daytime	13	udp	Daytime	[Jon_Postel]	[Jon_Postel]		[RFC867]
	fourteen	tcp	Unassigned
	fourteen	udp	Unassigned
	15	tcp	Unassigned [was netstat]
	15	udp	Unassigned
	16	tcp	Unassigned
	16	udp	Unassigned
qotd	17	tcp	Quote of the Day	[Jon_Postel]	[Jon_Postel]
qotd	17	udp	Quote of the Day	[Jon_Postel]	[Jon_Postel]
msp	18	tcp	Message Ship Protocol (historic)	[Rina_Nethaniel]	[Rina_Nethaniel]
msp	xviii	udp	Bulletin Ship Protocol (historic)	[Rina_Nethaniel]	[Rina_Nethaniel]
chargen	19	tcp	Character Generator
chargen	19	udp	Character Generator
ftp-data	xx	tcp	File Transfer [Default Information]	[Jon_Postel]	[Jon_Postel]
ftp-data	xx	udp	File Transfer [Default Information]	[Jon_Postel]	[Jon_Postel]
ftp-data	twenty	sctp	FTP	[Randall_Stewart]	[Randall_Stewart]	2022-02-07	[RFC9260]
ftp	21	tcp	File Transfer Protocol [Control]	[Jon_Postel]	[Jon_Postel]		[RFC959]		Defined TXT keys: u=<username> p=<password> path=<path>
ftp	21	udp	File Transfer Protocol [Control]	[Jon_Postel]	[Jon_Postel]		[RFC959]		Defined TXT keys: u=<username> p=<password> path=<path>
ftp	21	sctp	FTP	[Randall_Stewart]	[Randall_Stewart]	2022-02-07	[RFC9260]		Defined TXT keys: u=<username> p=<countersign> path=<path>
ssh	22	tcp	The Secure Trounce (SSH) Protocol				[RFC4251]		Defined TXT keys: u=<username> p=<password>
ssh	22	udp	The Secure Beat out (SSH) Protocol				[RFC4251]		Divers TXT keys: u=<username> p=<password>
ssh	22	sctp	SSH	[Randall_Stewart]	[Randall_Stewart]	2022-02-07	[RFC9260]		Defined TXT keys: u=<username> p=<countersign>
telnet	23	tcp	Telnet	[Jon_Postel]	[Jon_Postel]		[RFC854]		Defined TXT keys: u=<username> p=<countersign>
telnet	23	udp	Telnet	[Jon_Postel]	[Jon_Postel]		[RFC854]		Defined TXT keys: u=<username> p=<countersign>
	24	tcp	any private mail arrangement	[Rick_Adams]	[Rick_Adams]
	24	udp	any private mail system	[Rick_Adams]	[Rick_Adams]
smtp	25	tcp	Simple Postal service Transfer	[IESG]	[IETF_Chair]	2017-06-05	[RFC5321]
smtp	25	udp	Simple Mail Transfer	[IESG]	[IETF_Chair]	2017-06-05	[RFC5321]
	26	tcp	Unassigned
	26	udp	Unassigned
nsw-fe	27	tcp	NSW User System FE	[Robert_Thomas]	[Robert_Thomas]
nsw-fe	27	udp	NSW User System Fe	[Robert_Thomas]	[Robert_Thomas]
	28	tcp	Unassigned
	28	udp	Unassigned
msg-icp	29	tcp	MSG ICP	[Robert_Thomas]	[Robert_Thomas]
msg-icp	29	udp	MSG ICP	[Robert_Thomas]	[Robert_Thomas]
	30	tcp	Unassigned
	30	udp	Unassigned
msg-auth	31	tcp	MSG Authentication	[Robert_Thomas]	[Robert_Thomas]
msg-auth	31	udp	MSG Authentication	[Robert_Thomas]	[Robert_Thomas]
	32	tcp	Unassigned
	32	udp	Unassigned
dsp	33	tcp	Brandish Support Protocol	[Ed_Cain]	[Ed_Cain]
dsp	33	udp	Display Support Protocol	[Ed_Cain]	[Ed_Cain]
	34	tcp	Unassigned
	34	udp	Unassigned
	35	tcp	any individual printer server	[Jon_Postel]	[Jon_Postel]
	35	udp	any individual printer server	[Jon_Postel]	[Jon_Postel]
	36	tcp	Unassigned
	36	udp	Unassigned
fourth dimension	37	tcp	Time	[Jon_Postel]	[Jon_Postel]
fourth dimension	37	udp	Fourth dimension	[Jon_Postel]	[Jon_Postel]
rap	38	tcp	Road Admission Protocol	[Robert_Ullmann]	[Robert_Ullmann]
rap	38	udp	Route Admission Protocol	[Robert_Ullmann]	[Robert_Ullmann]
rlp	39	tcp	Resource Location Protocol	[Mike_Accetta]	[Mike_Accetta]
rlp	39	udp	Resource Location Protocol	[Mike_Accetta]	[Mike_Accetta]
	40	tcp	Unassigned
	twoscore	udp	Unassigned
graphics	41	tcp	Graphics
graphics	41	udp	Graphics
name	42	tcp	Host Proper noun Server
proper noun	42	udp	Host Name Server
nameserver	42	tcp	Host Name Server
nameserver	42	udp	Host Name Server
nicname	43	tcp	Who Is
nicname	43	udp	Who Is
mpm-flags	44	tcp	MPM FLAGS Protocol
mpm-flags	44	udp	MPM FLAGS Protocol
mpm	45	tcp	Message Processing Module [recv]
mpm	45	udp	Message Processing Module [recv]
mpm-snd	46	tcp	MPM [default send]	[Jon_Postel]	[Jon_Postel]

Contact Information

ID	Name	Organisation	Contact URI
[Bernie_Volz]	Bernie Volz		mailto:volz&cisco.com
[Ed_Cain]	Ed Cain		mailto:cain&edn-unix.dca.mil
[Eddie_Kohler]	Eddie Kohler	IETF dccp WG	mailto:kohler&cs.ucla.edu
[IESG]		IESG	mailto:iesg&ietf.org
[IETF_Chair]	IETF Chair	IETF	mailto:chair&ietf.org
[Jon_Postel]	Jon Postel		mailto:postel&isi.edu
[Mark_Lottor]	Marker Lottor		mailto:MKL&nisc.sri.com
[Mike_Accetta]	Mike Accetta		mailto:MIKE.ACCETTA&cmu-cs-a.edu
[Randall_Stewart]	Randall Stewart	IETF TSVWG	mailto:rrs&lakerest.net
[Rick_Adams]	Rick Adams		mailto:rick&uunet.uu.internet
[Rina_Nethaniel]	Rina Nethaniel
[Robert_Thomas]	Robert Thomas		mailto:BThomas&f.bbn.com
[Robert_Ullmann]	Robert Ullmann		mailto:ariel&earth.std.com