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
cl/1 172 tcp Network Innovations CL/1 [Kevin_DeVault] [Kevin_DeVault] This entry is an alias to "cl-1". This entry is now historic, not usable for use with many common service discovery mechanisms.
cl-1 172 udp Network Innovations CL/1

IANA assigned this well-formed service name as a replacement for "cl/1".
[Kevin_DeVault] [Kevin_DeVault]
cl/1 172 udp Network Innovations CL/1 [Kevin_DeVault] [Kevin_DeVault] This entry is an alias to "cl-1". This entry is now historic, not usable for use with many common service discovery mechanisms.
xyplex-mux 173 tcp Xyplex [Bob_Stewart] [Bob_Stewart]
xyplex-mux 173 udp Xyplex [Bob_Stewart] [Bob_Stewart]
mailq 174 tcp MAILQ [Rayan_Zachariassen] [Rayan_Zachariassen]
mailq 174 udp MAILQ [Rayan_Zachariassen] [Rayan_Zachariassen]
vmnet 175 tcp VMNET [Christopher_Tengi] [Christopher_Tengi]
vmnet 175 udp VMNET [Christopher_Tengi] [Christopher_Tengi]
genrad-mux 176 tcp GENRAD-MUX [Ron_Thornton] [Ron_Thornton]
genrad-mux 176 udp GENRAD-MUX [Ron_Thornton] [Ron_Thornton]
xdmcp 177 tcp X Display Manager Control Protocol [Robert_W_Scheifler] [Robert_W_Scheifler]
xdmcp 177 udp X Display Manager Control Protocol [Robert_W_Scheifler] [Robert_W_Scheifler]
nextstep 178 tcp NextStep Window Server [Leo_Hourvitz] [Leo_Hourvitz]
nextstep 178 udp NextStep Window Server [Leo_Hourvitz] [Leo_Hourvitz]
bgp 179 tcp Border Gateway Protocol [Kirk_Lougheed] [Kirk_Lougheed]
bgp 179 udp Border Gateway Protocol [Kirk_Lougheed] [Kirk_Lougheed]
bgp 179 sctp BGP [Randall_Stewart] [Randall_Stewart] 2022-02-07 [RFC9260]
ris 180 tcp Intergraph [Dave_Buehmann] [Dave_Buehmann]
ris 180 udp Intergraph [Dave_Buehmann] [Dave_Buehmann]
unify 181 tcp Unify [Daegis_Inc] [Chris_Anderson] 2012-07-31
unify 181 udp Unify [Daegis_Inc] [Chris_Anderson] 2012-07-31
audit 182 tcp Unisys Audit SITP [Gil_Greenbaum] [Gil_Greenbaum]
audit 182 udp Unisys Audit SITP [Gil_Greenbaum] [Gil_Greenbaum]
ocbinder 183 tcp OCBinder
ocbinder 183 udp OCBinder
ocserver 184 tcp OCServer [Jerrilynn_Okamura] [Jerrilynn_Okamura]
ocserver 184 udp OCServer [Jerrilynn_Okamura] [Jerrilynn_Okamura]
remote-kis 185 tcp Remote-KIS
remote-kis 185 udp Remote-KIS
kis 186 tcp KIS Protocol [Ralph_Droms] [Ralph_Droms]
kis 186 udp KIS Protocol [Ralph_Droms] [Ralph_Droms]
aci 187 tcp Application Communication Interface [Rick_Carlos] [Rick_Carlos]
aci 187 udp Application Communication Interface [Rick_Carlos] [Rick_Carlos]
mumps 188 tcp Plus Five's MUMPS [Hokey_Stenn] [Hokey_Stenn]
mumps 188 udp Plus Five's MUMPS [Hokey_Stenn] [Hokey_Stenn]
qft 189 tcp Queued File Transport [Wayne_Schroeder] [Wayne_Schroeder]
qft 189 udp Queued File Transport [Wayne_Schroeder] [Wayne_Schroeder]
gacp 190 tcp Gateway Access Control Protocol [C_Philip_Wood] [C_Philip_Wood]
gacp 190 udp Gateway Access Control Protocol [C_Philip_Wood] [C_Philip_Wood]
prospero 191 tcp Prospero Directory Service [B_Clifford_Neuman] [B_Clifford_Neuman]
prospero 191 udp Prospero Directory Service [B_Clifford_Neuman] [B_Clifford_Neuman]
osu-nms 192 tcp OSU Network Monitoring System [Doug_Karl] [Doug_Karl]
osu-nms 192 udp OSU Network Monitoring System [Doug_Karl] [Doug_Karl]
srmp 193 tcp Spider Remote Monitoring Protocol [Ted_J_Socolofsky] [Ted_J_Socolofsky]
srmp 193 udp Spider Remote Monitoring Protocol [Ted_J_Socolofsky] [Ted_J_Socolofsky]
irc 194 tcp Internet Relay Chat Protocol [Jarkko_Oikarinen] [Jarkko_Oikarinen]
irc 194 udp Internet Relay Chat Protocol [Jarkko_Oikarinen] [Jarkko_Oikarinen]
dn6-nlm-aud 195 tcp DNSIX Network Level Module Audit
dn6-nlm-aud 195 udp DNSIX Network Level Module Audit
dn6-smm-red 196 tcp DNSIX Session Mgt Module Audit Redir [Lawrence_Lebahn] [Lawrence_Lebahn]
dn6-smm-red 196 udp DNSIX Session Mgt Module Audit Redir [Lawrence_Lebahn] [Lawrence_Lebahn]
dls 197 tcp Directory Location Service
dls 197 udp Directory Location Service
dls-mon 198 tcp Directory Location Service Monitor [Scott_Bellew] [Scott_Bellew]
dls-mon 198 udp Directory Location Service Monitor [Scott_Bellew] [Scott_Bellew]
smux 199 tcp SMUX [Marshall_Rose] [Marshall_Rose]
smux 199 udp SMUX [Marshall_Rose] [Marshall_Rose]
at-rtmp 201 tcp AppleTalk Routing Maintenance
at-rtmp 201 udp AppleTalk Routing Maintenance
z39-50 210 tcp ANSI Z39.50

IANA assigned this well-formed service name as a replacement for "z39.50".
[Mark_H_Needleman] [Mark_H_Needleman]
z39.50 210 tcp ANSI Z39.50 [Mark_H_Needleman] [Mark_H_Needleman] This entry is an alias to "z39-50". This entry is now historic, not usable for use with many common service discovery mechanisms.
z39-50 210 udp ANSI Z39.50

IANA assigned this well-formed service name as a replacement for "z39.50".
[Mark_H_Needleman] [Mark_H_Needleman]
z39.50 210 udp ANSI Z39.50 [Mark_H_Needleman] [Mark_H_Needleman] This entry is an alias to "z39-50". This entry is now historic, not usable for use with many common service discovery mechanisms.
914c-g 211 tcp Texas Instruments 914C/G Terminal

IANA assigned this well-formed service name as a replacement for "914c/g".
[Bill_Harrell] [Bill_Harrell]
914c/g 211 tcp Texas Instruments 914C/G Terminal [Bill_Harrell] [Bill_Harrell] This entry is an alias to "914c-g". This entry is now historic, not usable for use with many common service discovery mechanisms.
914c-g 211 udp Texas Instruments 914C/G Terminal

IANA assigned this well-formed service name as a replacement for "914c/g".
[Bill_Harrell] [Bill_Harrell]
914c/g 211 udp Texas Instruments 914C/G Terminal [Bill_Harrell] [Bill_Harrell] This entry is an alias to "914c-g". This entry is now historic, not usable for use with many common service discovery mechanisms.
anet 212 tcp ATEXSSTR [Jim_Taylor] [Jim_Taylor]
anet 212 udp ATEXSSTR [Jim_Taylor] [Jim_Taylor]
ipx 213 tcp IPX [Don_Provan] [Don_Provan]
ipx 213 udp IPX [Don_Provan] [Don_Provan]
vmpwscs 214 tcp VM PWSCS [Dan_Shia] [Dan_Shia]
vmpwscs 214 udp VM PWSCS [Dan_Shia] [Dan_Shia]
softpc 215 tcp Insignia Solutions [Martyn_Thomas] [Martyn_Thomas]
softpc 215 udp Insignia Solutions [Martyn_Thomas] [Martyn_Thomas]
CAIlic 216 tcp Computer Associates Int'l License Server [Chuck_Spitz] [Chuck_Spitz]
CAIlic 216 udp Computer Associates Int'l License Server [Chuck_Spitz] [Chuck_Spitz]
dbase 217 tcp dBASE Unix [Don_Gibson] [Don_Gibson]
dbase 217 udp dBASE Unix [Don_Gibson] [Don_Gibson]
mpp 218 tcp Netix Message Posting Protocol [Shannon_Yeh] [Shannon_Yeh]
mpp 218 udp Netix Message Posting Protocol [Shannon_Yeh] [Shannon_Yeh]
uarps 219 tcp Unisys ARPs [Ashok_Marwaha] [Ashok_Marwaha]
uarps 219 udp Unisys ARPs [Ashok_Marwaha] [Ashok_Marwaha]
fln-spx 221 tcp Berkeley rlogind with SPX auth
fln-spx 221 udp Berkeley rlogind with SPX auth
225-241 Reserved [Jon_Postel] [Jon_Postel]
nsiiops 261 tcp IIOP Name Service over TLS/SSL [Jeff_Stewart] [Jeff_Stewart]
nsiiops 261 udp IIOP Name Service over TLS/SSL [Jeff_Stewart] [Jeff_Stewart]
gist 270 udp Q-mode encapsulation for GIST messages [RFC5971]
pt-tls 271 tcp IETF Network Endpoint Assessment (NEA) Posture Transport Protocol over TLS (PT-TLS) [IESG] [IETF_Chair] 2012-07-31 [RFC6876]
271 udp Reserved
personal-link 281 tcp Personal Link [Dan_Cummings] [Dan_Cummings]
personal-link 281 udp Personal Link [Dan_Cummings] [Dan_Cummings]
bhmds 310 tcp bhmds [John_Kelly] [John_Kelly]
bhmds 310 udp bhmds [John_Kelly] [John_Kelly]
asip-webadmin 311 tcp AppleShare IP WebAdmin [Ann_Huang] [Ann_Huang]
asip-webadmin 311 udp AppleShare IP WebAdmin [Ann_Huang] [Ann_Huang]
vslmp 312 tcp VSLMP [Gerben_Wierda] [Gerben_Wierda]
vslmp 312 udp VSLMP [Gerben_Wierda] [Gerben_Wierda]
magenta-logic 313 tcp Magenta Logic [Karl_Rousseau] [Karl_Rousseau]

Contact Information

ID Name Organization Contact URI Last Updated
[Ann_Huang] Ann Huang mailto:annhuang&apple.com
[Ashok_Marwaha] Ashok Marwaha
[B_Clifford_Neuman] B. Clifford Neuman mailto:bcn&isi.edu 2022-02-18
[Bill_Harrell] Bill Harrell
[Bob_Stewart] Bob Stewart mailto:STEWART&xyplex.com
[C_Philip_Wood] C. Philip Wood mailto:cpw&lanl.gov
[Chris_Anderson] Chris Anderson Daegis, Inc. mailto:ianaportmaster&daegis.com 2012-07-31
[Christopher_Tengi] Christopher Tengi mailto:tengi&princeton.edu
[Chuck_Spitz] Chuck Spitz mailto:spich04&cai.com
[Daegis_Inc] Daegis, Inc. mailto:ianaportmaster&daegis.com 2012-07-31
[Dan_Cummings] Dan Cummings mailto:doc&cnr.com
[Dan_Shia] Dan Shia mailto:dset!shia&uunet.uu.net
[Dave_Buehmann] Dave Buehmann mailto:ingr!daveb&uunet.uu.net
[Don_Gibson] Don Gibson mailto:sequent!aero!twinsun!ashtate.A-T.COM!dong&uunet.UU.NET
[Don_Provan] Don Provan mailto:donp&xlnvax.novell.com
[Doug_Karl] Doug Karl mailto:KARL-D&osu-20.ircc.ohio-state.edu
[Gerben_Wierda] Gerben Wierda mailto:Gerben_Wierda&rna.nl
[Gil_Greenbaum] Gil Greenbaum mailto:gcole&nisd.cam.unisys.com
[Hokey_Stenn] Hokey Stenn mailto:hokey&plus5.com
[IESG] IESG mailto:iesg&ietf.org
[IETF_Chair] IETF Chair IETF mailto:chair&ietf.org
[Jarkko_Oikarinen] Jarkko Oikarinen mailto:jto&tolsun.oulu.fi
[Jeff_Stewart] Jeff Stewart mailto:jstewart&netscape.com
[Jerrilynn_Okamura] Jerrilynn Okamura
[Jim_Taylor] Jim Taylor mailto:taylor&heart.epps.kodak.com
[John_Kelly] John Kelly mailto:johnk&bellhow.com
[Jon_Postel] Jon Postel mailto:postel&isi.edu
[Karl_Rousseau] Karl Rousseau mailto:kr&netfusion.co.uk
[Kevin_DeVault] Kevin DeVault
[Kirk_Lougheed] Kirk Lougheed mailto:LOUGHEED&mathom.cisco.com
[Lawrence_Lebahn] Lawrence Lebahn mailto:DIA3&paxrv-nes.navy.mil
[Leo_Hourvitz] Leo Hourvitz mailto:leo&next.com
[Mark_H_Needleman] Mark H. Needleman mailto:markn&sirsi.com
[Marshall_Rose] Marshall Rose mailto:mrose&dbc.mtview.ca.us
[Martyn_Thomas] Martyn Thomas
[Ralph_Droms] Ralph Droms mailto:rdroms&nri.reston.va.us
[Randall_Stewart] Randall Stewart IETF TSVWG mailto:rrs&lakerest.net
[Rayan_Zachariassen] Rayan Zachariassen mailto:rayan&ai.toronto.edu
[Rick_Carlos] Rick Carlos mailto:rick&ticipa.csc.ti.com
[Robert_W_Scheifler] Robert W. Scheifler mailto:RWS&xx.lcs.mit.edu
[Ron_Thornton] Ron Thornton mailto:thornton&aerostation.org 2020-09-01
[Scott_Bellew] Scott Bellew mailto:smb&cs.purdue.edu
[Shannon_Yeh] Shannon Yeh mailto:yeh&netix.com
[Ted_J_Socolofsky] Ted J. Socolofsky mailto:Teds&spider.co.uk
[Wayne_Schroeder] Wayne Schroeder mailto:schroeder&sds.sdsc.edu