Internet Assigned Numbers Authority

Service Name and Transport Protocol Port Number Registry

Last Updated
2024-03-18
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
tcpmux 1 tcp TCP Port Service Multiplexer [Mark_Lottor] [Mark_Lottor]
tcpmux 1 udp TCP Port Service Multiplexer [Mark_Lottor] [Mark_Lottor]
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 Active Users [Jon_Postel] [Jon_Postel]
12 tcp Unassigned
12 udp Unassigned
daytime 13 tcp Daytime [Jon_Postel] [Jon_Postel] [RFC867]
daytime 13 udp Daytime [Jon_Postel] [Jon_Postel] [RFC867]
14 tcp Unassigned
14 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 Send Protocol (historic) [Rina_Nethaniel] [Rina_Nethaniel]
msp 18 udp Message Send Protocol (historic) [Rina_Nethaniel] [Rina_Nethaniel]
chargen 19 tcp Character Generator
chargen 19 udp Character Generator
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=<password> 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] Defined TXT keys: u=<username> p=<password>
smtp 25 tcp Simple Mail Transfer [IESG] [IETF_Chair] 2017-06-05 [RFC5321]
smtp 25 udp Simple Mail Transfer [IESG] [IETF_Chair] 2017-06-05 [RFC5321]
msg-auth 31 tcp MSG Authentication [Robert_Thomas] [Robert_Thomas]
msg-auth 31 udp MSG Authentication [Robert_Thomas] [Robert_Thomas]
graphics 41 tcp Graphics
graphics 41 udp Graphics
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.
bootps 67 tcp Bootstrap Protocol Server [Bill_Croft] [Bill_Croft] [RFC951] Defined TXT keys: None
netrjs-1 71 tcp Remote Job Service
netrjs-1 71 udp Remote Job Service
finger 79 tcp Finger [David_Zimmerman] [David_Zimmerman] Unauthorized use by some mail users (see [RFC4146] for details)
finger 79 udp Finger [David_Zimmerman] [David_Zimmerman] Unauthorized use by some mail users (see [RFC4146] for details)
http 80 tcp World Wide Web HTTP [IESG] [IETF_Chair] 2021-10-01 [RFC9110] Defined TXT keys: u=<username> p=<password> path=<path to document>
http 80 udp World Wide Web HTTP [IESG] [IETF_Chair] 2021-10-01 [RFC9110] Defined TXT keys: u=<username> p=<password> path=<path to document>
www 80 tcp World Wide Web HTTP [IESG] [IETF_Chair] 2021-10-01 [RFC9110] This is a duplicate of the "http" service and should not be used for discovery purposes.
www 80 udp World Wide Web HTTP [IESG] [IETF_Chair] 2021-10-01 [RFC9110] This is a duplicate of the "http" service and should not be used for discovery purposes.
81 Unassigned 2007-09-06
kerberos 88 tcp Kerberos [B_Clifford_Neuman] [B_Clifford_Neuman] 2022-02-18 [RFC4120]
kerberos 88 udp Kerberos [B_Clifford_Neuman] [B_Clifford_Neuman] 2022-02-18 [RFC4120]
mit-dov 91 tcp MIT Dover Spooler [Eliot_Moss] [Eliot_Moss]
mit-dov 91 udp MIT Dover Spooler [Eliot_Moss] [Eliot_Moss]
100 Unassigned 2012-03-21 Known Unauthorized Use on 100
hostname 101 tcp NIC Host Name Server [Jon_Postel] [Jon_Postel]
hostname 101 udp NIC Host Name Server [Jon_Postel] [Jon_Postel]
iso-tsap 102 tcp ISO-TSAP Class 0 [Marshall_Rose] [Marshall_Rose]
iso-tsap 102 udp ISO-TSAP Class 0 [Marshall_Rose] [Marshall_Rose]
gppitnp 103 tcp Genesis Point-to-Point Trans Net
gppitnp 103 udp Genesis Point-to-Point Trans Net
acr-nema 104 tcp ACR-NEMA Digital Imag. & Comm. 300 [Patrick_McNamee] [Patrick_McNamee]
acr-nema 104 udp ACR-NEMA Digital Imag. & Comm. 300 [Patrick_McNamee] [Patrick_McNamee]
cso 105 tcp CCSO name server protocol [Martin_Hamilton] [Martin_Hamilton]
cso 105 udp CCSO name server protocol [Martin_Hamilton] [Martin_Hamilton]
csnet-ns 105 tcp Mailbox Name Nameserver [Marvin_Solomon] [Marvin_Solomon]
csnet-ns 105 udp Mailbox Name Nameserver [Marvin_Solomon] [Marvin_Solomon]
3com-tsmux 106 tcp 3COM-TSMUX [Jeremy_Siegel] [Jeremy_Siegel] Known Unauthorized Use on 106
3com-tsmux 106 udp 3COM-TSMUX [Jeremy_Siegel] [Jeremy_Siegel] Known Unauthorized Use on 106
rtelnet 107 tcp Remote Telnet Service [Jon_Postel] [Jon_Postel]
rtelnet 107 udp Remote Telnet Service [Jon_Postel] [Jon_Postel]
snagas 108 tcp SNA Gateway Access Server [Kevin_Murphy] [Kevin_Murphy]
snagas 108 udp SNA Gateway Access Server [Kevin_Murphy] [Kevin_Murphy]
pop2 109 tcp Post Office Protocol - Version 2 [Joyce_K_Reynolds] [Joyce_K_Reynolds]
pop2 109 udp Post Office Protocol - Version 2 [Joyce_K_Reynolds] [Joyce_K_Reynolds]
pop3 110 tcp Post Office Protocol - Version 3 [Marshall_Rose] [Marshall_Rose]
pop3 110 udp Post Office Protocol - Version 3 [Marshall_Rose] [Marshall_Rose]
sunrpc 111 tcp SUN Remote Procedure Call [Chuck_McManis] [Chuck_McManis]
sunrpc 111 udp SUN Remote Procedure Call [Chuck_McManis] [Chuck_McManis]
mcidas 112 tcp McIDAS Data Transmission Protocol [Glenn_Davis] [Glenn_Davis]
mcidas 112 udp McIDAS Data Transmission Protocol [Glenn_Davis] [Glenn_Davis]
ident 113 tcp
auth 113 tcp Authentication Service [Mike_St_Johns] [Mike_St_Johns]
auth 113 udp Authentication Service [Mike_St_Johns] [Mike_St_Johns]
114 unassigned Deprecated June 2004
sftp 115 tcp Simple File Transfer Protocol [Mark_Lottor] [Mark_Lottor]
sftp 115 udp Simple File Transfer Protocol [Mark_Lottor] [Mark_Lottor]
ansanotify 116 tcp ANSA REX Notify [Nicola_J_Howarth] [Nicola_J_Howarth]
ansanotify 116 udp ANSA REX Notify [Nicola_J_Howarth] [Nicola_J_Howarth]
uucp-path 117 tcp UUCP Path Service
uucp-path 117 udp UUCP Path Service
sqlserv 118 tcp SQL Services [Larry_Barnes] [Larry_Barnes]
sqlserv 118 udp SQL Services [Larry_Barnes] [Larry_Barnes]
nntp 119 tcp Network News Transfer Protocol [IESG] [IETF_Chair] 2018-07-06 [RFC3977]
nntp 119 udp Network News Transfer Protocol [IESG] [IETF_Chair] 2018-07-06 [RFC3977]
cfdptkt 120 tcp CFDPTKT [John_Ioannidis] [John_Ioannidis]
cfdptkt 120 udp CFDPTKT [John_Ioannidis] [John_Ioannidis]
erpc 121 tcp Encore Expedited Remote Pro.Call [Jack_ONeil] [Jack_ONeil]
erpc 121 udp Encore Expedited Remote Pro.Call [Jack_ONeil] [Jack_ONeil]
smakynet 122 tcp SMAKYNET [Pierre_Arnaud] [Pierre_Arnaud]
smakynet 122 udp SMAKYNET [Pierre_Arnaud] [Pierre_Arnaud]

Contact Information

ID Name Organization Contact URI Last Updated
[B_Clifford_Neuman] B. Clifford Neuman mailto:bcn&isi.edu 2022-02-18
[Bill_Croft] Bill Croft mailto:Croft&sumex-aim.stanford.edu
[Chuck_McManis] Chuck McManis mailto:cmcmanis&freegate.net
[David_Zimmerman] David Zimmerman mailto:dpz&rutgers.edu
[Eddie_Kohler] Eddie Kohler IETF dccp WG mailto:kohler&cs.ucla.edu
[Eliot_Moss] Eliot Moss mailto:EBM&xx.lcs.mit.edu
[Glenn_Davis] Glenn Davis mailto:support&unidata.ucar.edu
[IESG] IESG mailto:iesg&ietf.org
[IETF_Chair] IETF Chair IETF mailto:chair&ietf.org
[Jack_ONeil] Jack O'Neil
[Jeremy_Siegel] Jeremy Siegel mailto:jzs&nsd.3com.com
[John_Ioannidis] John Ioannidis mailto:ji&close.cs.columbia.ed
[Jon_Postel] Jon Postel mailto:postel&isi.edu
[Joyce_K_Reynolds] Joyce K. Reynolds mailto:jkrey&isi.edu
[Kevin_Murphy] Kevin Murphy mailto:murphy&sevens.lkg.dec.com
[Larry_Barnes] Larry Barnes mailto:barnes&broke.enet.dec.com
[Mark_Lottor] Mark Lottor mailto:MKL&nisc.sri.com
[Marshall_Rose] Marshall Rose mailto:mrose&dbc.mtview.ca.us
[Martin_Hamilton] Martin Hamilton mailto:martin&mrrl.lut.as.uk
[Marvin_Solomon] Marvin Solomon mailto:solomon&cs.wisc.edu
[Mike_St_Johns] Mike St. Johns mailto:stjohns&arpa.mil
[Nicola_J_Howarth] Nicola J. Howarth mailto:njh&ansa.co.uk
[Patrick_McNamee] Patrick McNamee
[Pierre_Arnaud] Pierre Arnaud mailto:pierre.arnaud&iname.com
[Randall_Stewart] Randall Stewart IETF TSVWG mailto:rrs&lakerest.net
[Rina_Nethaniel] Rina Nethaniel
[Robert_Thomas] Robert Thomas mailto:BThomas&f.bbn.com