What Are The Registered Ports

Service Proper noun and Ship Protocol Port Number Registry

Last Updated

2022-04-11

Expert(due south)

TCP/UDP: Joe Touch; Eliot Lear, Markku Kojo, Kumiko Ono, Martin Stiemerling,  Wes Eddy, Brian Trammell, and Jana Iyengar SCTP: Michael Tuexen DCCP: Eddie Kohler and Yoshifumi Nishida

Reference

[RFC6335]

Note

Service names and port numbers are used to distinguish between dissimilar services that run over transport protocols such as TCP, UDP, DCCP, and SCTP. Service names are assigned on a start-come, beginning-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 Individual Ports (49152-65535); the different uses of these ranges are described in [RFC6335]. Co-ordinate to Section 8.1.2 of [RFC6335], Organization Ports are assigned past the "IETF Review" or "IESG Approval" procedures described in [RFC8126]. User Ports are assigned by IANA using the "IETF Review" procedure, the "IESG Approval" process, or the "Practiced 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 Non be used without or prior to IANA registration. ************************************************************************ * PLEASE NOTE THE Following: * * * * Consignment OF A PORT NUMBER DOES NOT IN Any Manner IMPLY AN * * ENDORSEMENT OF AN Awarding 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 Proper noun	Port Number	Ship Protocol	Description	Assignee	Contact	Modification Date	Reference	Service Code	Assignment Notes
	0	tcp	Reserved	[Jon_Postel]	[Jon_Postel]
	0	udp	Reserved	[Jon_Postel]	[Jon_Postel]
tcpmux	one	tcp	TCP Port Service Multiplexer	[Mark_Lottor]	[Mark_Lottor]
tcpmux	ane	udp	TCP Port Service Multiplexer	[Mark_Lottor]	[Mark_Lottor]
compressnet	two	tcp	Management Utility
compressnet	two	udp	Management Utility
compressnet	3	tcp	Compression Procedure	[Bernie_Volz]	[Bernie_Volz]
compressnet	3	udp	Compression Process	[Bernie_Volz]	[Bernie_Volz]
	four	tcp	Unassigned
	4	udp	Unassigned
rje	5	tcp	Remote Job Entry	[Jon_Postel]	[Jon_Postel]
rje	5	udp	Remote Task Entry	[Jon_Postel]	[Jon_Postel]
	6	tcp	Unassigned
	six	udp	Unassigned
echo	7	tcp	Echo	[Jon_Postel]	[Jon_Postel]
echo	vii	udp	Repeat	[Jon_Postel]	[Jon_Postel]
	8	tcp	Unassigned
	8	udp	Unassigned
discard	9	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	[RFC-ietf-tsvwg-rfc4960-bis-nineteen]
discard	9	dccp	Discard	[Eddie_Kohler]	[Eddie_Kohler]		[RFC4340]	1145656131
	x	tcp	Unassigned
	ten	udp	Unassigned
systat	11	tcp	Active Users	[Jon_Postel]	[Jon_Postel]
systat	xi	udp	Agile Users	[Jon_Postel]	[Jon_Postel]
	12	tcp	Unassigned
	12	udp	Unassigned
daytime	xiii	tcp	Daytime	[Jon_Postel]	[Jon_Postel]		[RFC867]
daytime	thirteen	udp	Daytime	[Jon_Postel]	[Jon_Postel]		[RFC867]
	14	tcp	Unassigned
	14	udp	Unassigned
	15	tcp	Unassigned [was netstat]
	15	udp	Unassigned
	16	tcp	Unassigned
	xvi	udp	Unassigned
qotd	17	tcp	Quote of the Day	[Jon_Postel]	[Jon_Postel]
qotd	17	udp	Quote of the Solar day	[Jon_Postel]	[Jon_Postel]
msp	eighteen	tcp	Message Send Protocol (celebrated)	[Rina_Nethaniel]	[Rina_Nethaniel]
msp	eighteen	udp	Message Transport Protocol (historic)	[Rina_Nethaniel]	[Rina_Nethaniel]
chargen	xix	tcp	Character Generator
chargen	19	udp	Character Generator
ftp-data	xx	tcp	File Transfer [Default Data]	[Jon_Postel]	[Jon_Postel]
ftp-data	twenty	udp	File Transfer [Default Information]	[Jon_Postel]	[Jon_Postel]
ftp-information	20	sctp	FTP	[Randall_Stewart]	[Randall_Stewart]	2022-02-07	[RFC-ietf-tsvwg-rfc4960-bis-xix]
ftp	21	tcp	File Transfer Protocol [Command]	[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	[RFC-ietf-tsvwg-rfc4960-bis-19]		Defined TXT keys: u=<username> p=<countersign> path=<path>
ssh	22	tcp	The Secure Shell (SSH) Protocol				[RFC4251]		Defined TXT keys: u=<username> p=<password>
ssh	22	udp	The Secure Shell (SSH) Protocol				[RFC4251]		Divers TXT keys: u=<username> p=<password>
ssh	22	sctp	SSH	[Randall_Stewart]	[Randall_Stewart]	2022-02-07	[RFC-ietf-tsvwg-rfc4960-bis-xix]		Defined TXT keys: u=<username> p=<password>
telnet	23	tcp	Telnet	[Jon_Postel]	[Jon_Postel]		[RFC854]		Defined TXT keys: u=<username> p=<password>
telnet	23	udp	Telnet	[Jon_Postel]	[Jon_Postel]		[RFC854]		Defined TXT keys: u=<username> p=<password>
	24	tcp	whatever individual postal service system	[Rick_Adams]	[Rick_Adams]
	24	udp	whatsoever private post arrangement	[Rick_Adams]	[Rick_Adams]
smtp	25	tcp	Uncomplicated Mail Transfer	[IESG]	[IETF_Chair]	2017-06-05	[RFC5321]
smtp	25	udp	Unproblematic Post Transfer	[IESG]	[IETF_Chair]	2017-06-05	[RFC5321]
	26	tcp	Unassigned
	26	udp	Unassigned
nsw-fe	27	tcp	NSW User System Atomic number 26	[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]
	xxx	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	Display 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 private printer server	[Jon_Postel]	[Jon_Postel]
	35	udp	any private printer server	[Jon_Postel]	[Jon_Postel]
	36	tcp	Unassigned
	36	udp	Unassigned
time	37	tcp	Time	[Jon_Postel]	[Jon_Postel]
time	37	udp	Time	[Jon_Postel]	[Jon_Postel]
rap	38	tcp	Route Access Protocol	[Robert_Ullmann]	[Robert_Ullmann]
rap	38	udp	Road Access 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
	40	udp	Unassigned
graphics	41	tcp	Graphics
graphics	41	udp	Graphics
name	42	tcp	Host Proper name Server
name	42	udp	Host Name Server
nameserver	42	tcp	Host Proper name Server
nameserver	42	udp	Host Proper 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	Bulletin Processing Module [recv]
mpm-snd	46	tcp	MPM [default send]	[Jon_Postel]	[Jon_Postel]

Contact Information

ID	Name	Organization	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]	Marking 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&world.std.com