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 |
|---|---|---|---|---|---|---|---|---|---|---|---|
| core-rd | udp | Resource Directory accessed using CoAP | IESG | IETF Chair | 2021-03-16 | RFC 9176 | Defined TXT keys: None | ||||
| core-rd-tls | tcp | Resource Directory accessed using CoAP over TLS | IESG | IETF Chair | 2021-03-16 | 2022-04-14 | RFC 9176 | Defined TXT keys: None | |||
| core-rd-dtls | udp | Resource Directory accessed using CoAP over DTLS | IESG | IETF Chair | 2021-03-16 | RFC 9176 | Defined TXT keys: None | ||||
| dccp-ping | dccp | ping/traceroute using DCCP | Samuel Jero | Samuel Jero | 2012-11-14 | 1885957735 | Defined TXT keys: None | ||||
| dns-llq-tls | tcp | DNS Long-Lived Queries over TLS | Stuart Cheshire | Stuart Cheshire | 2019-05-04 | RFC 6281 | Defined TXT Keys: None | ||||
| dns-update-tls | tcp | DNS Dynamic Update Service over TLS | Stuart Cheshire | Stuart Cheshire | 2019-05-04 | RFC 6281 | DNS Dynamic Update Service for a given domain may not necessarily be provided by the principal name servers as advertised by the domain's "NS" records, and may not necessarily always be provided on port 53. The "_dns-update._udp.<domain>." SRV record gives the target host and port where DNS Dynamic Update Service is provided for the named domain. | ||||
| edge1 | tcp | Edge1 Base Station | Skycatch, Inc. | Ruben Beltran del Rio | 2018-02-09 | Defined TXT keys: None | |||||
| est-coaps | udp | EST over secure CoAP (EST-coaps) | Toerless Eckert | Toerless Eckert | 2022-05-03 | 2022-05-04 | RFC 9148. Defined TXT keys: None | ||||
| ewelink | tcp | eWeLink devices supporting LAN Control | Shenzhen CoolKit Technology Co., Ltd. | Michael Hu | 2019-01-17 | Defined TXT keys: txtvers, id, type, apivers, encrypt, data1, data2, data3, data4, iv | |||||
| eyetvsn | EyeTV Sharing | Elgato | Elgato | Defined TXT keys: txtvers=1, keyhash=<4 bytes> | |||||||
| fix | Financial Information Exchange (FIX) Protocol | Joakim Johansson | Joakim Johansson | Defined TXT keys: Currently valid enumerated values: FIX Session Protocol Versions (SESSIONVERSION): 1.1 FIX Application Protocol Versions (APPLICATIONVERSION): 2.7, 3.0, 4.0, 4.1, 4.2, 4.3, 4.4, 5.0 Possible TXT records defined and their values (replace uppercase text with enumerations from the list above): txtvers=1 fix=APPLICATIONVERSION fix supported=APPLICATIONVERSION[,APPLICATIONVERSION, ... ,APPLICATIONVERSION] fixt=SESSIONVERSION | |||||||
| help | HELP command | RFC 1078 | TCP Port Service Multiplexer (TCPMUX) | ||||||||
| hpr-bldlnx | HP Remote Build System for Linux-based Systems | Jeffrey J. Walls | Jeffrey J. Walls | Defined TXT keys: rh73, rhel3, rhel4, deb31, suse102 | |||||||
| hpr-toollnx | HP Remote System that houses compilers and tools for Linux-based Systems | Jeffrey J. Walls | Jeffrey J. Walls | Defined TXT keys: rh73, rhel3, rhel4, deb31, suse102 | |||||||
| hpr-tstlnx | HP Remote Test System for Linux-based Systems | Jeffrey J. Walls | Jeffrey J. Walls | Defined TXT keys: rh73, rhel3, rhel4, deb31, suse102 | |||||||
| iad1 | BBN IAD | 2013-05-24 | This service name is no longer in use. | ||||||||
| ichat | iChat 1.0 | Jens Alfke | Jens Alfke | Defined TXT keys: Proprietary | |||||||
| im | tcp | Instant Messaging | RFC 3861 | ||||||||
| im | udp | Instant Messaging | RFC 3861 | ||||||||
| jnx-kcsync | tcp | jollys keychain cloud sync protocol | Patrick Stein | Patrick Stein | 2011-10-24 | Defined TXT keys: hash=<40hex characters> salt=<40hex characters> uuid=<40hex characters> Example: hash=5e7580598c0d7064d4fc79faaeb42585e1a675f8 salt=f0164cb3a0c3d7efe75abea8fda86d2d56c8dda9 uuid=db61dc092922252e45bbb264f59147138c7fd5fa | |||||
| lsys-ezcfg | LinkSys EZ Configuration | Frank Zerangue | Frank Zerangue | Defined TXT keys: model=value (string) serial=value (sring) hwversion=value (string) swversion=value (string) ifversion=value (string) type=value (string) mac=value (12 hex digits) | |||||||
| lsys-oamp | LinkSys Operations, Administration, Management, and Provisioning | Frank Zerangue | Frank Zerangue | Defined TXT keys: model=value (string) serial=value (sring) hwversion=value (string) swversion=value (string) ifversion=value (string) type=value (string) mac=value (12 hex digits) | |||||||
| lumiere | tcp | A protocol to remotely control DMX512 devices over the network | Gangsta Ltd. | Jean-Charles Boude | 2011-10-13 | Defined TXT keys: None | |||||
| M30S1PT | tcp | Moritz30-Project Standard protocol 1 Plain Text | Moritz30 | Matthias Merkel | 2015-12-07 | Defined TXT keys: None | |||||
| M30S1PT | udp | Moritz30-Project Standard protocol 1 Plain Text | Moritz30 | Matthias Merkel | 2015-12-07 | Defined TXT keys: None | |||||
| mazepseudo-game | udp | Peer to peer communication between instances of the Maze Pseudo game. | Mad Elf Software, Inc. | Kenneth Suda | 2016-02-02 | 2016-03-30 | Defined TXT keys: 1 TXT record key for the RSA public key used by the server instance. | ||||
| mediaboard1 | MediaBoardONE Asset and Information Manager data sharing and synchronization protocol | Thomas K. Fischer | Thomas K. Fischer | Defined TXT keys: None | |||||||
| meshcop | udp | Thread Mesh Commissioning | Thread Group, Inc. | Esko Dijk | 2020-11-20 | Defined TXT keys: Thread 1.1 Specification, Section 8.4.1.1.2. https://www.threadgroup.org/ThreadSpec | |||||
| meshcop-e | udp | Thread Mesh Commissioning Ephemeral-key | Thread Group, Inc. | Esko Dijk | 2024-01-22 | Defined TXT keys: TXT records keys, if any, will be defined in Section 8.12 of the Thread Specification. https://www.threadgroup.org/ThreadSpec | |||||
| moodring | Bonjour Mood Ring tutorial program | Daniel Steinberg | Daniel Steinberg | Defined TXT keys: txtvers=1 mood=<ascii digit from 0-4> | |||||||
| nfs-domainroot | tcp | NFS service for the domain root, the root of an organization's published file namespace. | IESG | IETF Chair | 2012-04-24 | RFC 6641 | Defined TXT keys: None | ||||
| objective | Means for clients to locate servers in an Objective (http://www.objective.com) instance. | Marc Bailey | Marc Bailey | Defined TXT keys: txtvers='1' type={'production'|'standby'|'test'|'demo'} protocol={['SOAP'],['CORBA']} transport=['iiop']|['http'] | |||||||
| oca | tcp | Insecure OCP.1 protocol, which is the insecure TCP/IP implementation of the Object Control Architecture | OCA Alliance | Stephan van Tienen | 2012-10-11 | Defined TXT keys: txtvers=1 protovers=x | |||||
| oca | udp | Insecure OCP.1 protocol, which is the insecure TCP/IP implementation of the Object Control Architecture | OCA Alliance | Stephan van Tienen | 2012-10-11 | Defined TXT keys: txtvers=1 protovers=x | |||||
| ocasec | tcp | Secure OCP.1 protocol, which is the secure TCP/IP implementation of the Object Control Architecture | OCA Alliance | Stephan van Tienen | 2012-10-11 | Defined TXT keys: txtvers=1 protovers=x | |||||
| ocasec | udp | Secure OCP.1 protocol, which is the secure TCP/IP implementation of the Object Control Architecture | OCA Alliance | Stephan van Tienen | 2012-10-11 | Defined TXT keys: txtvers=1 protovers=x | |||||
| ocaws | tcp | Insecure OCP.1 hosted on a WebSocket | OCA Alliance | Stephan van Tienen | 2017-05-19 | Defined TXT keys: txtvers protovers path | |||||
| olpc-activity1 | udp | One Laptop per Child activity | One Laptop per Child/Collabora Ltd. | One Laptop per Child/Collabora Ltd. | Defined TXT keys: Shared_Activity_Protocol_1.0 | ||||||
| owhttpd | OWFS (1-wire file system) web server | Paul H Alfille | Paul H Alfille | Defined TXT keys: txtvers | |||||||
| pgpkey-http | PGP Keyserver using HTTP/1.1 | Jeroen Massar | Jeroen Massar | Defined TXT keys: path=<path on the server where the HKP applications reside> normally: "path=/pks/" | |||||||
| pres | tcp | Presence | RFC 3861 | ||||||||
| pres | udp | Presence | RFC 3861 | ||||||||
| presence | Peer-to-peer messaging / Link-Local Messaging | XMPP Registrar | XMPP Registrar | Defined TXT keys: See http://www.xmpp.org/registrar/linklocal.html Note: Registration updated May 2007. Was formerly listed as "iChat AV" (Apple's IM client for Mac OS X) with TXT keys: txtvers, port.p2pj, phsh, vc, 1st, AIM, msg, status, last When first shipped in Mac OS X 10.2, iChat's peer-to-peer messaging protocol was created to solve the problem of serverless messaging between peers on the same link. However, there is nothing inherent in the protocol that limits it to being only link-local; it was simply an artifact of iChat in Mac OS X 10.2 using link-local Multicast DNS to discover peers. With the advent of Wide-Area DNS-SD, it is also possible to use iChat's peer-to-peer messaging between machines on different links. | |||||||
| psap | udp | Progal Service Advertising Protocol | Soren Weber | Soren Weber | Defined TXT keys: c0, c1, ..., cn | ||||||
| ptp-req | PTP Initiation Request Protocol | Mark Wood | Mark Wood | Defined TXT keys: txtvers, guid, c0, c1, c2, ..., where the number of c_n attributes is variable | |||||||
| recipe-sharing | tcp | Recipe Sharing Protocol | Daniel G. Taylor | Daniel G. Taylor | 2007-11 | Defined TXT keys: http://www.recipemanager.org/rsp/rsp10draft.html#dnssd | |||||
| rfid | RFID Reader Mach1(tm) Protocol | Paul Dietrich | Paul Dietrich | Defined TXT keys: None | |||||||
| rgb | tcp | RGB Spectrum Device Discovery | RGB Spectrum | Steve Hershey | 2011-10-10 | Defined TXT keys: Keyboard, Mouse, Option1, Option2, Option3, Option4, ModelName | |||||
| robustirc | tcp | Like ircu (RFC 1459), but failure tolerant due to strong consistency among n>=3 servers | Michael Stapelberg | Michael Stapelberg | 2015-01-07 | Defined TXT keys: None | |||||
| roku-rcp | Roku Control Protocol | Don Woodward | Don Woodward | Defined TXT keys: txtvers=1 | |||||||
| see | SubEthaEdit 2 | TheCodingMonkeys | TheCodingMonkeys | Defined TXT keys: txtvers=1, name=<Full Name>, userid=<User ID>, version=2 | |||||||
| smimeca | tcp | Domain signing certificate for S/MIME keys | IESG | John Levine | 2016-07-26 | draft-bhjl-x509-srv-01 | Defined TXT keys: None | ||||
| sparql | SPARQL Protocol and RDF Query Language | Alex Tucker | Alex Tucker | Defined TXT keys: txtvers=1 path=<relative or absolute URL of endpoint> protovers=<number> [if not specified then default is 1.0, corresponding to SPARQL version] binding=<HTTP | SOAP> [if not specified then default is HTTP] vocabs=<space separated list of URIs> [RDF vocabularies or OWL ontologies used by the endpoint] metadata=<URL> [to fetch RDF/XML description of SPARQL service] | |||||||
| spx-hmp | tcp | SpinetiX HMP | SpinetiX S.A. | Diego Santa Cruz | 2011-10-18 | Defined TXT keys: txtvers=1 cport= the port for the content HTTP server (secondary HTTP server used for content publishing) mode= the mode in which the HMP device is currently operating, one of "normal", "safe" or "recovery" serial= serial number of the HMP device firmware= firmware version string (e.g., 2.1.0-0.1.7844) model= model string (e.g., HMP100) | |||||
| strobe-sync | tcp | Strobe Synchronization | Jasper Morgal | Richard Morgal | 2019-06-13 | Defined TXT keys: Application will rely upon Bonjour version 3.1.0.1 | |||||
| sugarlock-rcp | tcp | Remote control protocol for Sugarlock consumer electronics devices | Sugarlock, LLC | Don Woodward | 2016-01-22 | Defined TXT keys: txtvers=1 | |||||
| sugarlock-rcp | udp | Remote control protocol for Sugarlock consumer electronics devices | Sugarlock, LLC | Don Woodward | 2016-01-22 | Defined TXT keys: txtvers=1 | |||||
| tbricks | tbricks internal protocol | Joakim Johansson | Joakim Johansson | Defined TXT keys: txtvers=1, sesna, seid, setype, cosna, coid, cotype, sysna, syna, syid, subsyid, venid, protocols, pid | |||||||
| tinavigator | TI Navigator Hub 1.0 Discovery Service | Stephen Reid | Stephen Reid | Defined TXT keys: None | |||||||
| vedabase | tcp | Application specific synchronization protocol | Peter Kollath | Peter Kollath | 2014-05-27 | Defined TXT keys: txtvers=1 | |||||
| visel | visel Q-System services | Lehpaner Sasa | Lehpaner Sasa | Defined TXT keys: Version=<service version> Type=<service type> Name=<service Name> Zone=<service zone> ID=<serviceID> SString=<serviceString> SString1=<serviceString> | |||||||
| vxi-11 | VXI-11 TCP/IP Instrument Protocol | Nick Barendt | Nick Barendt | Defined TXT keys: None | |||||||
| wormhole | Roku Cascade Wormhole Protocol | Don Woodward | Don Woodward | Defined TXT keys: txtvers=1 | |||||||
| x510 | tcp | Security service to protocols | ITU-T Study Group 17 | Erik Andersen | 2019-08-13 | Defined TXT keys: None |
Contact Information
| Name | Organization | Contact URI | Last Updated |
|---|---|---|---|
| Alex Tucker | alex&floop.org.uk | ||
| Daniel G. Taylor | dan&programmer-art.org | 2007-11 | |
| Daniel Steinberg | daniel&oreilly.com | ||
| Diego Santa Cruz | SpinetiX S.A. | Diego.SantaCruz&spinetix.com | 2011-10-18 |
| Don Woodward | dwoodward&rokulabs.com | ||
| Don Woodward | don&sugarlock.comm | 2016-01-22 | |
| Elgato | support&elgato.com | ||
| Erik Andersen | era&x500.eu | 2019-08-13 | |
| Esko Dijk | Thread Group, Inc. | esko.dijk&iotconsultancy.nl | 2024-01-22 |
| Frank Zerangue | fzerang&cisco.com | ||
| Gangsta Ltd. | jc&gangstamedia.com | 2011-10-13 | |
| IESG | iesg&ietf.org | ||
| IETF Chair | IETF | chair&ietf.org | |
| ITU-T Study Group 17 | era&x500.eu | 2019-08-13 | |
| Jasper Morgal | jpmorgal8&gmail.com | 2019-06-13 | |
| Jean-Charles Boude | Gangsta Ltd. | jc&gangstamedia.com | 2011-10-17 |
| Jeffrey J. Walls | jeff.walls&hp.com | ||
| Jens Alfke | jens&apple.com | ||
| Jeroen Massar | jeroen&unfix.org | ||
| Joakim Johansson | joakim.johansson&tbricks.com | ||
| John Levine | standards&taugh.com | 2016-07-26 | |
| Kenneth Suda | Mad Elf Software, Inc. | help&madelfsoftware.com | 2016-03-30 |
| Lehpaner Sasa | lsasa&visel.it | ||
| Mad Elf Software, Inc. | help&madelfsoftware.com | 2016-03-30 | |
| Marc Bailey | marc&objective.com | ||
| Mark Wood | mark.d.wood&kodak.com | ||
| Matthias Merkel | moritz30&moritz30.de | 2015-12-07 | |
| Michael Hu | Shenzhen CoolKit Technology Co., Ltd. | michael.hu&coolkit.cn | 2019-01-17 |
| Michael Stapelberg | michael+iana&stapelberg.ch | 2015-01-07 | |
| Moritz30 | moritz30&moritz30.de | 2015-12-07 | |
| Nick Barendt | nbarendt&vxitech.com | ||
| OCA Alliance | tina.lipscomb&oca-alliance.com | 2017-05-19 | |
| One Laptop per Child/Collabora Ltd. | devel&lists.laptop.org | ||
| Patrick Stein | Patrick.Stein&jinx.eu | 2011-10-24 | |
| Paul Dietrich | registrar&impinj.com | ||
| Paul H Alfille | paul.alfille&gmail.com | ||
| Peter Kollath | root&gopal.home.sk | 2014-05-27 | |
| RGB Spectrum | shershey&rgb.com | 2011-10-10 | |
| Richard Morgal | rmorgal&wildblue.net | 2019-06-13 | |
| Ruben Beltran del Rio | benb&skycatch.com | 2018-02-09 | |
| Samuel Jero | sj323707&ohio.edu | 2012-11-14 | |
| Shenzhen CoolKit Technology Co., Ltd. | admin&coolkit.cn | 2019-01-17 | |
| Skycatch, Inc. | dev&skycatch.com | 2018-02-09 | |
| Soren Weber | sw&ditec-gmbh.de | ||
| SpinetiX S.A. | Diego.SantaCruz&spinetix.com | 2011-10-18 | |
| Stephen Reid | sreid&ti.com | ||
| Stephan van Tienen | OCA Alliance | stephan.vantienen&bosch.com | 2017-05-19 |
| Steve Hershey | RGB Spectrum | shershey&rgb.com | 2011-10-10 |
| Stuart Cheshire | cheshire&apple.com | 2022-07-11 | |
| Sugarlock, LLC | don&sugarlock.com | 2016-01-22 | |
| TheCodingMonkeys | monkeys&codingmonkeys.de | ||
| Thomas K. Fischer | thomas.fischer&interservices.de | ||
| Thread Group, Inc. | help&threadgroup.org | 2024-01-22 | |
| Toerless Eckert | tte&cs.fau.de | 2022-05-03 | |
| XMPP Registrar | registrar&xmpp.org |