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
smakynet 122 udp SMAKYNET [Pierre_Arnaud] [Pierre_Arnaud]
ntp 123 tcp Network Time Protocol [Dave_Mills] [Dave_Mills] [RFC5905]
ntp 123 udp Network Time Protocol [Dave_Mills] [Dave_Mills] [RFC5905]
ansatrader 124 tcp ANSA REX Trader [Nicola_J_Howarth] [Nicola_J_Howarth]
ansatrader 124 udp ANSA REX Trader [Nicola_J_Howarth] [Nicola_J_Howarth]
locus-map 125 tcp Locus PC-Interface Net Map Ser [Eric_Peterson] [Eric_Peterson]
locus-map 125 udp Locus PC-Interface Net Map Ser [Eric_Peterson] [Eric_Peterson]
nxedit 126 tcp NXEdit [Don_Payette] [Don_Payette] Port 126 Previously assigned to application below unitary 126/tcp Unisys Unitary Login unitary 126/udp Unisys Unitary Login <feil&kronos.nisd.cam.unisys.com> Port 126 Previously assigned to application above
nxedit 126 udp NXEdit [Don_Payette] [Don_Payette] Port 126 Previously assigned to application below unitary 126/tcp Unisys Unitary Login unitary 126/udp Unisys Unitary Login <feil&kronos.nisd.cam.unisys.com> Port 126 Previously assigned to application above
locus-con 127 tcp Locus PC-Interface Conn Server [Eric_Peterson] [Eric_Peterson]
locus-con 127 udp Locus PC-Interface Conn Server [Eric_Peterson] [Eric_Peterson]
gss-xlicen 128 tcp GSS X License Verification [John_Light] [John_Light]
gss-xlicen 128 udp GSS X License Verification [John_Light] [John_Light]
pwdgen 129 tcp Password Generator Protocol [Frank_J_Wacho] [Frank_J_Wacho]
pwdgen 129 udp Password Generator Protocol [Frank_J_Wacho] [Frank_J_Wacho]
cisco-fna 130 tcp cisco FNATIVE
cisco-fna 130 udp cisco FNATIVE
cisco-tna 131 tcp cisco TNATIVE
cisco-tna 131 udp cisco TNATIVE
cisco-sys 132 tcp cisco SYSMAINT
cisco-sys 132 udp cisco SYSMAINT
statsrv 133 tcp Statistics Service [Dave_Mills_2] [Dave_Mills_2]
statsrv 133 udp Statistics Service [Dave_Mills_2] [Dave_Mills_2]
ingres-net 134 tcp INGRES-NET Service [Mike_Berrow] [Mike_Berrow]
ingres-net 134 udp INGRES-NET Service [Mike_Berrow] [Mike_Berrow]
epmap 135 tcp DCE endpoint resolution [Joe_Pato] [Joe_Pato]
epmap 135 udp DCE endpoint resolution [Joe_Pato] [Joe_Pato]
profile 136 tcp PROFILE Naming System [Larry_Peterson] [Larry_Peterson]
profile 136 udp PROFILE Naming System [Larry_Peterson] [Larry_Peterson]
netbios-ns 137 tcp NETBIOS Name Service
netbios-ns 137 udp NETBIOS Name Service
netbios-dgm 138 tcp NETBIOS Datagram Service
netbios-dgm 138 udp NETBIOS Datagram Service
netbios-ssn 139 tcp NETBIOS Session Service [Jon_Postel] [Jon_Postel]
netbios-ssn 139 udp NETBIOS Session Service [Jon_Postel] [Jon_Postel]
emfis-data 140 tcp EMFIS Data Service
emfis-data 140 udp EMFIS Data Service
emfis-cntl 141 tcp EMFIS Control Service [Gerd_Beling] [Gerd_Beling]
emfis-cntl 141 udp EMFIS Control Service [Gerd_Beling] [Gerd_Beling]
bl-idm 142 tcp Britton-Lee IDM [Susie_Snitzer] [Susie_Snitzer]
bl-idm 142 udp Britton-Lee IDM [Susie_Snitzer] [Susie_Snitzer]
imap 143 tcp Internet Message Access Protocol [IESG] [IETF_Chair] 2021-02-22 [RFC3501][RFC9051]
143 udp Reserved 2021-02-22 [RFC9051]
uma 144 tcp Universal Management Architecture [Jay_Whitney] [Jay_Whitney]
uma 144 udp Universal Management Architecture [Jay_Whitney] [Jay_Whitney]
uaac 145 tcp UAAC Protocol [David_A_Gomberg] [David_A_Gomberg]
uaac 145 udp UAAC Protocol [David_A_Gomberg] [David_A_Gomberg]
iso-tp0 146 tcp ISO-IP0
iso-tp0 146 udp ISO-IP0
iso-ip 147 tcp ISO-IP [Marshall_Rose] [Marshall_Rose]
iso-ip 147 udp ISO-IP [Marshall_Rose] [Marshall_Rose]
jargon 148 tcp Jargon [Bill_Weinman] [Bill_Weinman]
jargon 148 udp Jargon [Bill_Weinman] [Bill_Weinman]
aed-512 149 tcp AED 512 Emulation Service [Albert_G_Broscius] [Albert_G_Broscius]
aed-512 149 udp AED 512 Emulation Service [Albert_G_Broscius] [Albert_G_Broscius]
sql-net 150 tcp SQL-NET [Martin_Picard] [Martin_Picard]
sql-net 150 udp SQL-NET [Martin_Picard] [Martin_Picard]
hems 151 tcp HEMS
hems 151 udp HEMS
bftp 152 tcp Background File Transfer Program [Annette_DeSchon] [Annette_DeSchon]
bftp 152 udp Background File Transfer Program [Annette_DeSchon] [Annette_DeSchon]
sgmp 153 tcp SGMP [Marty_Schoffstahl] [Marty_Schoffstahl]
sgmp 153 udp SGMP [Marty_Schoffstahl] [Marty_Schoffstahl]
netsc-prod 154 tcp NETSC
netsc-prod 154 udp NETSC
netsc-dev 155 tcp NETSC [Sergio_Heker] [Sergio_Heker]
netsc-dev 155 udp NETSC [Sergio_Heker] [Sergio_Heker]
sqlsrv 156 tcp SQL Service [Craig_Rogers] [Craig_Rogers]
sqlsrv 156 udp SQL Service [Craig_Rogers] [Craig_Rogers]
knet-cmp 157 tcp KNET/VM Command/Message Protocol [Gary_S_Malkin] [Gary_S_Malkin]
knet-cmp 157 udp KNET/VM Command/Message Protocol [Gary_S_Malkin] [Gary_S_Malkin]
pcmail-srv 158 tcp PCMail Server [Mark_L_Lambert] [Mark_L_Lambert]
pcmail-srv 158 udp PCMail Server [Mark_L_Lambert] [Mark_L_Lambert]
nss-routing 159 tcp NSS-Routing [Yakov_Rekhter] [Yakov_Rekhter]
nss-routing 159 udp NSS-Routing [Yakov_Rekhter] [Yakov_Rekhter]
sgmp-traps 160 tcp SGMP-TRAPS [Marty_Schoffstahl] [Marty_Schoffstahl]
sgmp-traps 160 udp SGMP-TRAPS [Marty_Schoffstahl] [Marty_Schoffstahl]
snmp 161 tcp SNMP
snmp 161 udp SNMP
snmptrap 162 tcp SNMPTRAP [Marshall_Rose] [Marshall_Rose]
snmptrap 162 udp SNMPTRAP [Marshall_Rose] [Marshall_Rose]
cmip-man 163 tcp CMIP/TCP Manager
cmip-man 163 udp CMIP/TCP Manager
cmip-agent 164 tcp CMIP/TCP Agent [Amatzia_Ben_Artzi] [Amatzia_Ben_Artzi]
cmip-agent 164 udp CMIP/TCP Agent [Amatzia_Ben_Artzi] [Amatzia_Ben_Artzi]
xns-courier 165 tcp Xerox [Susie_Armstrong_2] [Susie_Armstrong_2]
xns-courier 165 udp Xerox [Susie_Armstrong_2] [Susie_Armstrong_2]
s-net 166 tcp Sirius Systems [Brian_Lloyd] [Brian_Lloyd]
s-net 166 udp Sirius Systems [Brian_Lloyd] [Brian_Lloyd]
namp 167 tcp NAMP [Marty_Schoffstahl] [Marty_Schoffstahl]
namp 167 udp NAMP [Marty_Schoffstahl] [Marty_Schoffstahl]
rsvd 168 tcp RSVD [Alan_Sandell] [Alan_Sandell] 2008-05-01
rsvd 168 udp RSVD [Alan_Sandell] [Alan_Sandell] 2008-05-01
send 169 tcp SEND [William_Oldwin] [William_Oldwin] 2019-04-22
send 169 udp SEND [William_Oldwin] [William_Oldwin] 2019-04-22
print-srv 170 tcp Network PostScript [Brian_Reid] [Brian_Reid]
print-srv 170 udp Network PostScript [Brian_Reid] [Brian_Reid]
multiplex 171 tcp Network Innovations Multiplex
multiplex 171 udp Network Innovations Multiplex
cl-1 172 tcp Network Innovations CL/1

IANA assigned this well-formed service name as a replacement for "cl/1".
[Kevin_DeVault] [Kevin_DeVault]
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.

Contact Information

ID Name Organization Contact URI Last Updated
[Alan_Sandell] Alan Sandell mailto:alan.sandell&ist.co.uk 2008-05-01
[Albert_G_Broscius] Albert G. Broscius mailto:broscius&dsl.cis.upenn.edu
[Amatzia_Ben_Artzi] Amatzia Ben-Artzi
[Annette_DeSchon] Annette DeSchon mailto:DESCHON&isi.edu
[Bill_Weinman] Bill Weinman mailto:wew&bearnet.com
[Brian_Lloyd] Brian Lloyd mailto:brian&lloyd.com
[Brian_Reid] Brian Reid mailto:reid&decwrl.dec.com
[Craig_Rogers] Craig Rogers mailto:Rogers&isi.edu
[Dave_Mills] Dave Mills mailto:mills&udel.edu 2022-06-03
[Dave_Mills_2] Dave Mills mailto:Mills&huey.udel.edu
[David_A_Gomberg] David A. Gomberg mailto:gomberg&gateway.mitre.org
[Don_Payette] Don Payette mailto:Don.Payette&unisys.com
[Eric_Peterson] Eric Peterson mailto:lcc.eric&seas.ucla.edu
[Frank_J_Wacho] Frank J. Wacho mailto:WANCHO&wsmr-simtel20.army.mil
[Gary_S_Malkin] Gary S. Malkin mailto:GMALKIN&xylogics.com
[Gerd_Beling] Gerd Beling mailto:GBELING&isi.edu
[IESG] IESG mailto:iesg&ietf.org
[IETF_Chair] IETF Chair IETF mailto:chair&ietf.org
[Jay_Whitney] Jay Whitney mailto:jw&powercenter.com
[Joe_Pato] Joe Pato mailto:pato&apollo.hp.com
[John_Light] John Light mailto:johnl&gssc.gss.com
[Jon_Postel] Jon Postel mailto:postel&isi.edu
[Kevin_DeVault] Kevin DeVault
[Larry_Peterson] Larry Peterson mailto:llp&arizona.edu
[Mark_L_Lambert] Mark L. Lambert mailto:markl&ptt.lcs.mit.edu
[Marshall_Rose] Marshall Rose mailto:mrose&dbc.mtview.ca.us
[Martin_Picard] Martin Picard
[Marty_Schoffstahl] Marty Schoffstahl mailto:schoff&nisc.nyser.net
[Mike_Berrow] Mike Berrow
[Nicola_J_Howarth] Nicola J. Howarth mailto:njh&ansa.co.uk
[Pierre_Arnaud] Pierre Arnaud mailto:pierre.arnaud&iname.com
[Sergio_Heker] Sergio Heker mailto:heker&jvncc.csc.org
[Susie_Armstrong_2] Susie Armstrong mailto:Armstrong.wbst128&xerox.com
[Susie_Snitzer] Susie Snitzer
[William_Oldwin] William Oldwin mailto:william&bitsome.ie 2022-01-28
[Yakov_Rekhter] Yakov Rekhter mailto:Yakov&ibm.com