Service Name and Transport Protocol Port Number Registry
Last Updated
- 2026-10-13
Expert(s)
- TCP/UDP: Joe Touch; Eliot Lear, Kumiko Ono, Wes Eddy, Brian Trammell, and Michael Scharf
- SCTP: Michael Tuexen
- DCCP: Eddie Kohler and Yoshifumi Nishida
Reference
- RFC 6335: Internet Assigned Numbers Authority (IANA) Procedures for the Management of the Service Name and Transport Protocol Port Number Registry
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 basis, as described in RFC 6335.
Port numbers are divided into three ranges, with their uses and assignment procedures specified in Section 8.1.2 of RFC 6335:
- System Ports (0-1023) are assigned using the IETF Review or IESG Approval procedures.
- User Ports (1024-49151) are assigned using the IETF Review, IESG Approval, or Expert Review procedures.
- Dynamic and/or Private Ports (49152-65535) are not assigned.
The registration procedures for service names and port numbers are specified in RFC 6335, while the registration policies referenced above are defined in RFC 8126.
Assigned ports both System and User ports SHOULD NOT be used without or prior to IANA registration.
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.
Registration Forms
- To request a new assignment, please use the Application for Service Names and User Port Numbers form.
- To modify an existing assignment, please use the Modify a Port Number Assignment form.
Available Formats
| Service Name | Port Number | Transport Protocol | Description | Assignee | Contact | Registration Date | Modification Date | Reference | Service Code | Unauthorized Use Reported | Assignment Notes |
|---|---|---|---|---|---|---|---|---|---|---|---|
| rtip | 771 | udp | |||||||||
| cycleserv2 | 772 | tcp | |||||||||
| cycleserv2 | 772 | udp | |||||||||
| 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 | RFC 6242 | |||||||
| netconf-ssh | 830 | udp | NETCONF over SSH | RFC 6242 | |||||||
| 831 | tcp | Reserved | 2025-09-29 | Previously assigned to NETCONF over BEEP but released by RFC 9900 | |||||||
| 831 | udp | Reserved | 2025-09-29 | Previously assigned to NETCONF over BEEP but released by RFC 9900 | |||||||
| 832 | tcp | Reserved | 2025-09-29 | Previously assigned to NETCONF over SOAP but released by RFC 9900 | |||||||
| 832 | udp | Reserved | 2025-09-29 | Previously assigned to NETCONF over SOAP but released by RFC 9900 | |||||||
| 833 | tcp | Reserved | 2025-09-29 | Previously assigned to NETCONF over SOAP but released by RFC 9900 | |||||||
| 833 | udp | Reserved | 2025-09-29 | Previously assigned to NETCONF over SOAP but released by RFC 9900 | |||||||
| 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 | RFC 3547 | |||||||
| gdoi | 848 | udp | GDOI | RFC 3547 | |||||||
| 849-852 | Unassigned | ||||||||||
| domain-s | 853 | tcp | DNS query-response protocol run over TLS | IESG | IETF Chair | 2015-10-08 | 2022-04-11 | RFC 7858 | |||
| domain-s | 853 | udp | DNS query-response protocol run over DTLS or QUIC | IESG | IETF Chair | 2015-10-08 | 2022-04-01 | RFC 7858; RFC 8094; RFC 9250 | |||
| dlep | 854 | tcp | Dynamic Link Exchange Protocol (DLEP) | IESG | IETF Chair | 2017-04-03 | RFC 8175 | ||||
| dlep | 854 | udp | Dynamic Link Exchange Protocol (DLEP) | IESG | IETF Chair | 2017-04-03 | RFC 8175 | ||||
| 855-859 | Unassigned | ||||||||||
| iscsi | 860 | tcp | iSCSI | IESG | IETF Chair | 2013-08-27 | RFC 7143 | ||||
| iscsi | 860 | udp | iSCSI | IESG | IETF Chair | 2013-08-27 | RFC 7143 | ||||
| owamp-control | 861 | tcp | OWAMP-Control | IESG | IETF Chair | RFC 4656 | |||||
| owamp-test | 861 | udp | OWAMP-Test | IESG | IETF Chair | 2018-12-21 | RFC 8545 | ||||
| twamp-control | 862 | tcp | TWAMP-Control | IESG | IETF Chair | RFC 5357 | |||||
| twamp-test | 862 | udp | TWAMP-Test Receiver Port | IESG | IETF Chair | 2018-12-21 | RFC 8545 | ||||
| 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) | RFC 4430 | |||||||
| kink | 910 | udp | Kerberized Internet Negotiation of Keys (KINK) | RFC 4430 | |||||||
| 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 | RFC 3340 | |||||||
| apex-edge | 913 | udp | APEX endpoint-relay service | RFC 3340 | |||||||
| 914 | tcp | Reserved | |||||||||
| rift-lies | 914 | udp | Routing in Fat Trees Link Information Element | IESG | IETF Chair | 2023-02-17 | 2024-06-07 | RFC 9692 | |||
| 915 | tcp | Reserved | |||||||||
| rift-ties | 915 | udp | Routing in Fat Trees Topology Information Element | IESG | IETF Chair | 2023-02-17 | 2024-06-07 | RFC 9692 | |||
| 916-952 | Unassigned | ||||||||||
| rndc | 953 | tcp | BIND9 remote name daemon controller | Internet Systems Consortium, Inc. | Ray Bellis | 2017-06-08 | |||||
| 953 | udp | Reserved |
Contact Information
| Name | Organization | Contact URI | Last Updated |
|---|---|---|---|
| Alejandro Bonet | babel&ctv.es | ||
| Andrew Tridgell | tridge&samba.anu.edu.au | ||
| Bernard Volz | bevolz&gmail.com | 2022-08-03 | |
| Bill Carroll | billc&xactlabs.com | ||
| Bob Lyon | bl&oasis.icl.co.uk | ||
| Carlisle Adams | Cadams&entrust.com | ||
| Christian Callsen | Christian.Callsen&eng.sun.com | ||
| Dennis Dube | dennis.dube&schneider-electric.com | 2014-06-10 | |
| IESG | iesg&ietf.org | ||
| IETF Chair | IETF | chair&ietf.org | |
| Internet Systems Consortium, Inc. | info&isc.org | 2017-06-08 | |
| Josyula R. Rao | jrrao&watson.ibm.com | ||
| Leif Ekblad | leif&rdos.net | ||
| modbus.org | rbelliardi&modbus.org | 2014-06-10 | |
| Paul Whittemore | paul&softarc.com | ||
| Portnoy Boxman | portnoy_boxman&bmc.com | 2005-01 | |
| Ray Bellis | ray&isc.org | 2017-06-08 | |
| Steve Scherf | steve&moonsoft.com | ||
| Steve Sweeney | Steven_Sweeney&3mail.3com.com | ||
| Wo'o Ideafarm | b85f3c23.9ad6f42c&ideafarm.com |