Internet Assigned Numbers Authority

Service Name and Transport Protocol Port Number Registry

Last Updated
2024-12-20
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
19399-19409 Unassigned
hp-sco 19410 tcp hp-sco [Larry_Schwartz] [Larry_Schwartz]
hp-sco 19410 udp hp-sco [Larry_Schwartz] [Larry_Schwartz]
sxuptp 19540 tcp SXUPTP [Keiji_Okuma] [Keiji_Okuma] 2002-08
sxuptp 19540 udp SXUPTP [Keiji_Okuma] [Keiji_Okuma] 2002-08
faircom-db 19790 tcp FairCom Database [FairCom_Corporation] [Michael_Bowers] 2020-12-04
19790 udp Reserved
iec-104-sec 19998 tcp IEC 60870-5-104 process control - secure [Grant_Gilchrist] [Grant_Gilchrist] 2010-10-18
dnp 20000 tcp DNP [Michael_Thesing] [Michael_Thesing]
dnp 20000 udp DNP [Michael_Thesing] [Michael_Thesing]
dnp 20000 sctp Distributed Network Protocol [DNP_Users_Group] [Andrew_West] 2022-12-20
microsan 20001 tcp MicroSAN [Thomas_E_Ludwig] [Thomas_E_Ludwig] 2004-02
microsan 20001 udp MicroSAN [Thomas_E_Ludwig] [Thomas_E_Ludwig] 2004-02
commtact-http 20002 tcp Commtact HTTP [Tomas_Svoboda] [Tomas_Svoboda] 2004-12
commtact-http 20002 udp Commtact HTTP [Tomas_Svoboda] [Tomas_Svoboda] 2004-12
commtact-https 20003 tcp Commtact HTTPS [Tomas_Svoboda] [Tomas_Svoboda] 2004-12
commtact-https 20003 udp Commtact HTTPS [Tomas_Svoboda] [Tomas_Svoboda] 2004-12
20004 Unassigned
openwebnet 20005 tcp OpenWebNet protocol for electric network [BTicino_S_p_A] [BTicino_S_p_A] 2008-04-09
openwebnet 20005 udp OpenWebNet protocol for electric network [BTicino_S_p_A] [BTicino_S_p_A] 2008-04-09
20006-20011 Unassigned
20012 tcp Reserved
ss-idi-disc 20012 udp Samsung Interdevice Interaction discovery [Hong_Jungkih] [Hong_Jungkih]
ss-idi 20013 tcp Samsung Interdevice Interaction [Hong_Jungkih] [Hong_Jungkih]
20013 udp Reserved
opendeploy 20014 tcp OpenDeploy Listener [Todd_Scallan] [Todd_Scallan] 2005-08
opendeploy 20014 udp OpenDeploy Listener [Todd_Scallan] [Todd_Scallan] 2005-08
20015-20033 Unassigned
nburn-id 20034 tcp NetBurner ID Port

IANA assigned this well-formed service name as a replacement for "nburn_id".
[Paul_Breed] [Paul_Breed] 2003-11
nburn_id 20034 tcp NetBurner ID Port [Paul_Breed] [Paul_Breed] 2003-11 This entry is an alias to "nburn-id". This entry is now historic, not usable for use with many common service discovery mechanisms.
nburn-id 20034 udp NetBurner ID Port

IANA assigned this well-formed service name as a replacement for "nburn_id".
[Paul_Breed] [Paul_Breed] 2003-11
nburn_id 20034 udp NetBurner ID Port [Paul_Breed] [Paul_Breed] 2003-11 This entry is an alias to "nburn-id". This entry is now historic, not usable for use with many common service discovery mechanisms.
20035-20045 Unassigned
tmophl7mts 20046 tcp TMOP HL7 Message Transfer Service [Tim_Riley] [Tim_Riley] 2009-07-31
tmophl7mts 20046 udp TMOP HL7 Message Transfer Service [Tim_Riley] [Tim_Riley] 2009-07-31
20047-20047 Unassigned
mountd 20048 tcp NFS mount protocol [Nicolas_Williams] [Nicolas_Williams] 2010-08-09
mountd 20048 udp NFS mount protocol [Nicolas_Williams] [Nicolas_Williams] 2010-08-09
nfsrdma 20049 tcp Network File System (NFS) over RDMA 2017-09-05 [RFC8267]
nfsrdma 20049 udp Network File System (NFS) over RDMA 2017-09-05 [RFC8267]
nfsrdma 20049 sctp Network File System (NFS) over RDMA 2017-09-05 [RFC8267]
20050-20056 Unassigned
avesterra 20057 tcp AvesTerra Hypergraph Transfer Protocol (HGTP) [Georgetown_University] [J.C._Smart] 2016-06-06
20057 udp Reserved
20058-20166 Unassigned
tolfab 20167 tcp TOLfab Data Change [Pierre_Couderc] [Pierre_Couderc] 2006-03
tolfab 20167 udp TOLfab Data Change [Pierre_Couderc] [Pierre_Couderc] 2006-03
20168-20201 Unassigned
ipdtp-port 20202 tcp IPD Tunneling Port [Vikki_Yin_Wei] [Vikki_Yin_Wei] 2003-01
ipdtp-port 20202 udp IPD Tunneling Port [Vikki_Yin_Wei] [Vikki_Yin_Wei] 2003-01
20203-20221 Unassigned
ipulse-ics 20222 tcp iPulse-ICS [Meggie_Garica_Woodru] [Meggie_Garica_Woodru]
ipulse-ics 20222 udp iPulse-ICS [Meggie_Garica_Woodru] [Meggie_Garica_Woodru]
20223-20479 Unassigned
emwavemsg 20480 tcp emWave Message Service [Harald_Striepe] [Harald_Striepe] 2008-02-14
emwavemsg 20480 udp emWave Message Service [Harald_Striepe] [Harald_Striepe] 2008-02-14
20481-20669 Unassigned
track 20670 tcp Track [Michael_Sweet] [Michael_Sweet]
track 20670 udp Track [Michael_Sweet] [Michael_Sweet]
20671-20809 Unassigned
crtech-nlm 20810 tcp CRTech NLM [Cullimore_And_Ring_Technologies] [Dave_Wilkins] 2021-06-24
20810 udp Reserved
20811-20998 Unassigned
athand-mmp 20999 tcp At Hand MMP [Stepan_Riha] [Stepan_Riha]
athand-mmp 20999 udp AT Hand MMP [Stepan_Riha] [Stepan_Riha]
irtrans 21000 tcp IRTrans Control [Marcus_Mueller] [Marcus_Mueller] 2004-11
irtrans 21000 udp IRTrans Control [Marcus_Mueller] [Marcus_Mueller] 2004-11
21001-21009 Unassigned
notezilla-lan 21010 tcp Notezilla.Lan Server [Conceptworld_Corporation] [Gautam_Jain] 2013-08-20
21010 udp Reserved
21011-21211 Unassigned
21214-21220 Unassigned
vofr-gateway 21590 tcp VoFR Gateway [Marty_Borden] [Marty_Borden]
vofr-gateway 21590 udp VoFR Gateway [Marty_Borden] [Marty_Borden]
tvpm 21800 tcp TVNC Pro Multiplexing [Brian_Blevins] [Brian_Blevins]
tvpm 21800 udp TVNC Pro Multiplexing [Brian_Blevins] [Brian_Blevins]
sal 21801 tcp Safe AutoLogon [WM_Software_Inc.] [WM_Software_Inc.] 2022-07-05 2022-07-06
21802-21844 Unassigned
21850-21999 Unassigned
snapenetio 22000 tcp SNAPenetIO [Kevin_Kuhns] [Kevin_Kuhns]
snapenetio 22000 udp SNAPenetIO [Kevin_Kuhns] [Kevin_Kuhns]
optocontrol 22001 tcp OptoControl [Kevin_Kuhns] [Kevin_Kuhns]
optocontrol 22001 udp OptoControl [Kevin_Kuhns] [Kevin_Kuhns]
optohost002 22002 tcp Opto Host Port 2 [Doug_Leany] [Doug_Leany] 2006-09
optohost002 22002 udp Opto Host Port 2 [Doug_Leany] [Doug_Leany] 2006-09
optohost003 22003 tcp Opto Host Port 3 [Doug_Leany] [Doug_Leany] 2006-09
optohost003 22003 udp Opto Host Port 3 [Doug_Leany] [Doug_Leany] 2006-09
optohost004 22004 tcp Opto Host Port 4 [Doug_Leany] [Doug_Leany] 2006-09
optohost004 22004 udp Opto Host Port 4 [Doug_Leany] [Doug_Leany] 2006-09
optohost004 22005 tcp Opto Host Port 5 [Doug_Leany] [Doug_Leany] 2006-09
optohost004 22005 udp Opto Host Port 5 [Doug_Leany] [Doug_Leany] 2006-09
22006-22124 Unassigned
22274-22304 Unassigned
cis 22305 tcp CompactIS Tunnel [Justin_Paupore] [Justin_Paupore] 2007-08-16
cis 22305 udp CompactIS Tunnel [Justin_Paupore] [Justin_Paupore] 2007-08-16
22306-22332 Unassigned
codemeter 22350 tcp CodeMeter Standard [Wolfgang_Voelker] [Wolfgang_Voelker] 2007-06
codemeter 22350 udp CodeMeter Standard [Wolfgang_Voelker] [Wolfgang_Voelker] 2007-06
aws-brf 22800 tcp Telerate Information Platform LAN [Timo_Sivonen] [Timo_Sivonen]
aws-brf 22800 udp Telerate Information Platform LAN [Timo_Sivonen] [Timo_Sivonen]
22801-22950 Unassigned

Contact Information

ID Name Organization Contact URI Last Updated
[Andrew_West] Andrew West mailto:andrew.west&ieee.org 2022-12-20
[BTicino_S_p_A] BTicino S.p.A. mailto:admin-myopen&myopen-bticino.it 2008-04-09
[Brian_Blevins] Brian Blevins mailto:brian.blevins&tridia.com
[Conceptworld_Corporation] Conceptworld Corporation mailto:admin&conceptworld.com 2013-08-20
[Cullimore_And_Ring_Technologies] Cullimore And Ring Technologies mailto:dave.wilkins&crtech.com 2021-06-24
[Dave_Wilkins] Dave Wilkins mailto:dave.wilkins&crtech.com 2021-06-24
[DNP_Users_Group] DNP Users Group mailto:chair_tech&dnp.org 2022-12-20
[Doug_Leany] Doug Leany mailto:DLEANY&opto22.com 2006-09
[FairCom_Corporation] FairCom Corporation mailto:alysha.brown&faircom.com 2020-12-04
[Gautam_Jain] Gautam Jain Conceptworld Corporation mailto:admin&conceptworld.com 2013-08-20
[Georgetown_University] Georgetown University mailto:smart&georgetown.edu 2016-06-06
[Grant_Gilchrist] Grant Gilchrist mailto:grant&enernex.com 2010-10-18
[Harald_Striepe] Harald Striepe mailto:harald&quantumintech.com 2008-02-14
[Hong_Jungkih] Hong, Jungkih mailto:jungkih.hong&samsung.com 2010-09-20
[J.C._Smart] J.C. Smart mailto:smart&georgetown.edu 2016-06-06
[Justin_Paupore] Justin Paupore mailto:jpaupore&blueshiftlabs.net 2007-08-16
[Keiji_Okuma] Keiji Okuma mailto:okuma&silex.jp 2005-08
[Kevin_Kuhns] Kevin Kuhns mailto:kkuhns&opto22.com
[Larry_Schwartz] Larry Schwartz mailto:lrs&cup.hp.com
[Marcus_Mueller] Marcus Mueller mailto:marcus&irtrans.de 2004-11
[Marty_Borden] Marty Borden mailto:mborden&tollbridgetech.com
[Meggie_Garica_Woodru] Meggie Garica-Woodruff mailto:ipulse&ericsson.com
[Michael_Bowers] Michael Bowers FairCom Corporation mailto:mike.bowers&faircom.com 2020-12-04
[Michael_Sweet] Michael Sweet mailto:msweet&ctr.nawcad.navy.mil
[Michael_Thesing] Michael Thesing mailto:michael.thesing&acsatlanta.com
[Nicolas_Williams] Nicolas Williams mailto:Nicolas.Williams&oracle.com 2010-08-09
[Paul_Breed] Paul Breed mailto:paul&netburner.com 2003-11
[Pierre_Couderc] Pierre Couderc mailto:pcouderc&tol.fr 2006-03
[Stepan_Riha] Stepan Riha mailto:stepan.riha&hand.com
[Thomas_E_Ludwig] Thomas E. Ludwig mailto:tom.ludwig&zetera.com 2004-02
[Tim_Riley] Tim Riley mailto:rileyt&saic.com 2009-07-31
[Timo_Sivonen] Timo Sivonen mailto:timo.sivonen&ccmail.dowjones.com
[Todd_Scallan] Todd Scallan mailto:tscallan&interwoven.com 2005-08
[Tomas_Svoboda] Tomas Svoboda mailto:svoboda&infima.cz 2004-12
[Vikki_Yin_Wei] Vikki Yin Wei mailto:vikki&ipdynamics.com 2003-01
[WM_Software_Inc.] WM Software Inc. mailto:support&wmsoftware.com 2022-07-18
[Wolfgang_Voelker] Wolfgang Voelker mailto:wolfgang.voelker&wibu.com 2007-06