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
submit 773 tcp
notify 773 udp
rpasswd 774 tcp
acmaint-dbd 774 udp

IANA assigned this well-formed service name as a replacement for "acmaint_dbd".
acmaint_dbd 774 udp This entry is an alias to "acmaint-dbd". This entry is now historic, not usable for use with many common service discovery mechanisms.
entomb 775 tcp
acmaint-transd 775 udp

IANA assigned this well-formed service name as a replacement for "acmaint_transd".
acmaint_transd 775 udp This entry is an alias to "acmaint-transd". This entry is now historic, not usable for use with many common service discovery mechanisms.
wpages 776 tcp [Josyula_R_Rao] [Josyula_R_Rao]
wpages 776 udp [Josyula_R_Rao] [Josyula_R_Rao]
multiling-http 777 tcp Multiling HTTP [Alejandro_Bonet] [Alejandro_Bonet]
multiling-http 777 udp Multiling HTTP [Alejandro_Bonet] [Alejandro_Bonet]
778-779 Unassigned
wpgs 780 tcp [Josyula_R_Rao] [Josyula_R_Rao]
wpgs 780 udp [Josyula_R_Rao] [Josyula_R_Rao]
781-785 Unassigned
786 Unassigned 2002-05-08
787 Unassigned 2002-10-08
788-799 Unassigned Unauthorized Use Known on port 796
mdbs-daemon 800 tcp

IANA assigned this well-formed service name as a replacement for "mdbs_daemon".
mdbs_daemon 800 tcp This entry is an alias to "mdbs-daemon". This entry is now historic, not usable for use with many common service discovery mechanisms.
mdbs-daemon 800 udp

IANA assigned this well-formed service name as a replacement for "mdbs_daemon".
mdbs_daemon 800 udp This entry is an alias to "mdbs-daemon". This entry is now historic, not usable for use with many common service discovery mechanisms.
device 801 tcp
device 801 udp
mbap-s 802 tcp Modbus Application Protocol Secure [modbus.org] [Dennis_Dube] 2014-06-10
mbap-s 802 udp Modbus Application Protocol Secure [modbus.org] [Dennis_Dube] 2014-06-10
803-809 Unassigned
fcp-udp 810 tcp FCP [Paul_Whittemore] [Paul_Whittemore]
fcp-udp 810 udp FCP Datagram [Paul_Whittemore] [Paul_Whittemore]
811-827 Unassigned
itm-mcell-s 828 tcp itm-mcell-s [Portnoy_Boxman] [Portnoy_Boxman]
itm-mcell-s 828 udp itm-mcell-s [Portnoy_Boxman] [Portnoy_Boxman]
pkix-3-ca-ra 829 tcp PKIX-3 CA/RA [Carlisle_Adams] [Carlisle_Adams]
pkix-3-ca-ra 829 udp PKIX-3 CA/RA [Carlisle_Adams] [Carlisle_Adams]
netconf-ssh 830 tcp NETCONF over SSH [RFC6242]
netconf-ssh 830 udp NETCONF over SSH [RFC6242]
netconf-beep 831 tcp NETCONF over BEEP [RFC4744]
netconf-beep 831 udp NETCONF over BEEP [RFC4744]
netconfsoaphttp 832 tcp NETCONF for SOAP over HTTPS [RFC4743]
netconfsoaphttp 832 udp NETCONF for SOAP over HTTPS [RFC4743]
netconfsoapbeep 833 tcp NETCONF for SOAP over BEEP [RFC4743]
netconfsoapbeep 833 udp NETCONF for SOAP over BEEP [RFC4743]
834-846 Unassigned
dhcp-failover2 847 tcp dhcp-failover 2 [Bernard_Volz] [Bernard_Volz]
dhcp-failover2 847 udp dhcp-failover 2 [Bernard_Volz] [Bernard_Volz]
gdoi 848 tcp GDOI [RFC3547]
gdoi 848 udp GDOI [RFC3547]
849-852 Unassigned
domain-s 853 tcp DNS query-response protocol run over TLS [IESG] [IETF_Chair] 2015-10-08 2022-04-11 [RFC7858]
domain-s 853 udp DNS query-response protocol run over DTLS or QUIC [IESG] [IETF_Chair] 2015-10-08 2022-04-01 [RFC7858][RFC8094][RFC9250]
dlep 854 tcp Dynamic Link Exchange Protocol (DLEP) [IESG] [IETF_Chair] 2017-04-03 [RFC8175]
dlep 854 udp Dynamic Link Exchange Protocol (DLEP) [IESG] [IETF_Chair] 2017-04-03 [RFC8175]
855-859 Unassigned
iscsi 860 tcp iSCSI [IESG] [IETF_Chair] 2013-08-27 [RFC7143]
iscsi 860 udp iSCSI [IESG] [IETF_Chair] 2013-08-27 [RFC7143]
owamp-control 861 tcp OWAMP-Control [IESG] [IETF_Chair] [RFC4656]
owamp-test 861 udp OWAMP-Test [IESG] [IETF_Chair] 2018-12-21 [RFC8545]
twamp-control 862 tcp TWAMP-Control [IESG] [IETF_Chair] [RFC5357]
twamp-test 862 udp TWAMP-Test Receiver Port [IESG] [IETF_Chair] 2018-12-21 [RFC8545]
863-872 Unassigned
rsync 873 tcp rsync [Andrew_Tridgell] [Andrew_Tridgell]
rsync 873 udp rsync [Andrew_Tridgell] [Andrew_Tridgell]
874-885 Unassigned
iclcnet-locate 886 tcp ICL coNETion locate server [Bob_Lyon] [Bob_Lyon]
iclcnet-locate 886 udp ICL coNETion locate server [Bob_Lyon] [Bob_Lyon]
iclcnet-svinfo 887 tcp ICL coNETion server info

IANA assigned this well-formed service name as a replacement for "iclcnet_svinfo".
[Bob_Lyon] [Bob_Lyon]
iclcnet_svinfo 887 tcp ICL coNETion server info [Bob_Lyon] [Bob_Lyon] This entry is an alias to "iclcnet-svinfo". This entry is now historic, not usable for use with many common service discovery mechanisms.
iclcnet-svinfo 887 udp ICL coNETion server info

IANA assigned this well-formed service name as a replacement for "iclcnet_svinfo".
[Bob_Lyon] [Bob_Lyon]
iclcnet_svinfo 887 udp ICL coNETion server info [Bob_Lyon] [Bob_Lyon] This entry is an alias to "iclcnet-svinfo". This entry is now historic, not usable for use with many common service discovery mechanisms.
accessbuilder 888 tcp AccessBuilder [Steve_Sweeney] [Steve_Sweeney]
accessbuilder 888 udp AccessBuilder [Steve_Sweeney] [Steve_Sweeney]
cddbp 888 tcp CD Database Protocol [Steve_Scherf] [Steve_Scherf] This entry records an unassigned but widespread use
889-899 Unassigned
omginitialrefs 900 tcp OMG Initial Refs [Christian_Callsen] [Christian_Callsen]
omginitialrefs 900 udp OMG Initial Refs [Christian_Callsen] [Christian_Callsen]
smpnameres 901 tcp SMPNAMERES [Leif_Ekblad] [Leif_Ekblad]
smpnameres 901 udp SMPNAMERES [Leif_Ekblad] [Leif_Ekblad]
ideafarm-door 902 tcp self documenting Telnet Door
ideafarm-door 902 udp self documenting Door: send 0x00 for info
ideafarm-panic 903 tcp self documenting Telnet Panic Door [Wo_o_Ideafarm] [Wo_o_Ideafarm]
ideafarm-panic 903 udp self documenting Panic Door: send 0x00 for info [Wo_o_Ideafarm] [Wo_o_Ideafarm]
904-909 Unassigned
kink 910 tcp Kerberized Internet Negotiation of Keys (KINK) [RFC4430]
kink 910 udp Kerberized Internet Negotiation of Keys (KINK) [RFC4430]
xact-backup 911 tcp xact-backup [Bill_Carroll] [Bill_Carroll]
xact-backup 911 udp xact-backup [Bill_Carroll] [Bill_Carroll]
apex-mesh 912 tcp APEX relay-relay service
apex-mesh 912 udp APEX relay-relay service
apex-edge 913 tcp APEX endpoint-relay service [RFC3340]
apex-edge 913 udp APEX endpoint-relay service [RFC3340]
914 tcp Reserved
rift-lies 914 udp Routing in Fat Trees Link Information Element [IESG] [IETF_Chair] 2023-02-17 2024-06-07 [RFC-ietf-rift-rift-24]
915 tcp Reserved
rift-ties 915 udp Routing in Fat Trees Topology Information Element [IESG] [IETF_Chair] 2023-02-17 2024-06-07 [RFC-ietf-rift-rift-24]
916-952 Unassigned
rndc 953 tcp BIND9 remote name daemon controller [Internet_Systems_Consortium_Inc] [Ray_Bellis] 2017-06-08
953 udp Reserved
954-988 Unassigned
ftps-data 989 tcp ftp protocol, data, over TLS/SSL
ftps-data 989 udp ftp protocol, data, over TLS/SSL

Contact Information

ID Name Organization Contact URI Last Updated
[Alejandro_Bonet] Alejandro Bonet mailto:babel&ctv.es
[Andrew_Tridgell] Andrew Tridgell mailto:tridge&samba.anu.edu.au
[Bernard_Volz] Bernard Volz mailto:bevolz&gmail.com 2022-08-03
[Bill_Carroll] Bill Carroll mailto:billc&xactlabs.com
[Bob_Lyon] Bob Lyon mailto:bl&oasis.icl.co.uk
[Carlisle_Adams] Carlisle Adams mailto:Cadams&entrust.com
[Christian_Callsen] Christian Callsen mailto:Christian.Callsen&eng.sun.com
[Dennis_Dube] Dennis Dube mailto:dennis.dube&schneider-electric.com 2014-06-10
[IESG] IESG mailto:iesg&ietf.org
[IETF_Chair] IETF Chair IETF mailto:chair&ietf.org
[Internet_Systems_Consortium_Inc] Internet Systems Consortium, Inc. mailto:info&isc.org 2017-06-08
[Josyula_R_Rao] Josyula R. Rao mailto:jrrao&watson.ibm.com
[Leif_Ekblad] Leif Ekblad mailto:leif&rdos.net
[modbus.org] modbus.org mailto:rbelliardi&modbus.org 2014-06-10
[Paul_Whittemore] Paul Whittemore mailto:paul&softarc.com
[Portnoy_Boxman] Portnoy Boxman mailto:portnoy_boxman&bmc.com 2005-01
[Ray_Bellis] Ray Bellis mailto:ray&isc.org 2017-06-08
[Steve_Scherf] Steve Scherf mailto:steve&moonsoft.com
[Steve_Sweeney] Steve Sweeney mailto:Steven_Sweeney&3mail.3com.com
[Wo_o_Ideafarm] Wo'o Ideafarm mailto:b85f3c23.9ad6f42c&ideafarm.com