Networking reference
TCP & UDP Port Numbers – Service & Protocol Lookup
Search the complete IANA service-name and port-number registry by port, protocol, service, assignee or RFC, including TCP, UDP, SCTP, DCCP and unqualified entries.
| Port | Protocol | Service | Description | Assignee | Registration date | Reference/RFC | Status | Record details |
|---|---|---|---|---|---|---|---|---|
| — | Not specified | ipbroadcaster | IP Broadcaster | 10base-t Interactive | — | — | Service name only | → |
| — | TCP | iperfd | Network socket performance test | Robert McMahon | 2022-09-02 | — | Service name only | → |
| — | UDP | iperfd | Network socket performance test | Robert McMahon | 2022-09-02 | — | Service name only | → |
| — | Not specified | ipspeaker | IP Speaker Control Protocol | Dan Mahn | — | — | Service name only | → |
| — | TCP | iqp | Control protocol for Phase One devices | Phase One | 2018-01-16 | — | Service name only | → |
| — | TCP | irc-iot | The universal protocol for building IoT | Alexey Y. Woronov | 2019-12-20 | — | Service name only | → |
| — | TCP | ir-hvac-000 | HVAC SMIL Server | Ingersoll Rand, Inc. | 2011-09-28 | — | Service name only | → |
| — | Not specified | irelay | iRelay application discovery service | Marc Diamante | — | — | Service name only | → |
| — | Not specified | irmc | Intego Remote Management Console | Olivier Delecluse | — | — | Service name only | → |
| — | TCP | irobotmcs | iRobot Monitor and Control Service | iRobot Corporation | 2013-11-07 | — | Service name only | → |
| — | UDP | irobotmcs | iRobot Monitor and Control Service | iRobot Corporation | 2013-11-07 | — | Service name only | → |
| — | TCP | iroid-sd | Iroid Data Service Discovery | iroïd | 2016-04-22 | — | Service name only | → |
| — | TCP | irradiatd-iclip | iClip clipboard transfer | Irradiated Software | 2012-06-19 | — | Service name only | → |
| — | TCP | irt-sharing | Image Resizer Toolbox preview sharing service | fnxsoftware.com | 2015-06-30 | — | Service name only | → |
| — | Not specified | isparx | iSparx | Philipp Dreiss | — | — | Service name only | → |
| — | Not specified | ispq-vc | iSpQ VideoChat | Chris Silverberg | — | — | Service name only | → |
| — | Not specified | ishare | iShare | Steve Dekorte | — | — | Service name only | → |
| — | Not specified | isticky | iSticky | Insist | — | — | Service name only | → |
| — | Not specified | istorm | iStorm | Math Game House Software | — | — | Service name only | → |
| — | TCP | isynchronize | iSynchronize data synchronization protocol | Smart Apps LTD | 2011-10-11 | — | Service name only | → |
| — | TCP | itap-publish | iTap Publishing Service | HLW Software Development GmbH | 2011-10-11 | — | Service name only | → |
| — | Not specified | itis-device | IT-IS International Ltd. Device | Ben Webster | — | — | Service name only | → |
| — | Not specified | itsrc | iTunes Socket Remote Control | Kevin Leacock | — | — | Service name only | → |
| — | Not specified | ivef | Inter VTS Exchange Format | Harry ten Berge | — | — | Service name only | → |
| — | Not specified | iwork | iWork Server | IGG Software | — | — | Service name only | → |
| — | TCP | izira | Integrated Business Data Exchange | Blue Ridge Concepts, Inc. | 2020-09-04 | — | Service name only | → |
| — | Not specified | jcan | Northrup Grumman/TASC/JCAN Protocol | Laurent Mihalkovic | — | — | Service name only | → |
| — | Not specified | jeditx | Jedit X | Satoshi Matsumoto | — | — | Service name only | → |
| — | Not specified | jini | Jini Service Discovery | Daniel Steinberg | — | — | Service name only | → |
| — | TCP | jmap | JSON Meta Application Protocol | IESG | 2016-01-22 | [RFC8620] | Service name only | → |
| — | TCP | jnx-kcsync | jollys keychain cloud sync protocol | Patrick Stein | 2011-10-24 | — | Service name only | → |
| — | Not specified | jtag | Proprietary | Uwe Ziegler (Goepel electronic GmbH) | — | — | Service name only | → |
| — | TCP | jukebox | Jukebox Request Service | Gary Giebler | 2011-10-18 | — | Service name only | → |
| — | TCP | jukejoint | Music sharing protocol | Phrenetic Apps LLC | 2016-04-12 | — | Service name only | → |
| — | TCP | keynoteaccess | KeynoteAccess is used for sending remote requests/responses when controlling a slideshow with Keynote Remote | Apple | 2011-10-12 | — | Service name only | → |
| — | TCP | keynotepairing | KeynotePairing is used to pair Keynote Remote with Keynote | Apple | 2011-10-12 | — | Service name only | → |
| — | TCP | kiwin | Topology Discovery | Stephen [kiwin] PALM | 2015-06-30 | — | Service name only | → |
| — | TCP | knx | KNX Discovery Protocol | KNX Association cvba | 2023-08-10 | — | Service name only | → |
| — | UDP | knx | Discovery in KNX IoT Point API | KNX Association cvba | 2022-10-21 | — | Service name only | → |
| — | Not specified | ktp | Kabira Transaction Platform | Ramiro Sarmiento | — | — | Service name only | → |
| — | TCP | kyma | Symbolic Sound Kyma Service Discovery | Symbolic Sound Corporation | 2018-11-28 | — | Service name only | → |
| — | Not specified | la-maint | IMP Logical Address Maintenance | — | — | — | Service name only | → |
| — | UDP | labyrinth | Labyrinth local multiplayer protocol | Andreas Alptun | — | — | Service name only | → |
| — | Not specified | lan2p | Lan2P Peer-to-Peer Network Protocol | Ben Guild | — | — | Service name only | → |
| — | Not specified | lapse | Gawker | Phil Piwonka | — | — | Service name only | → |
| — | TCP | larvaio-control | Larva IP Controller | larva.io ltd. | 2019-02-11 | — | Service name only | → |
| — | UDP | larvaio-control | Larva IP Controller | larva.io ltd. | 2019-02-11 | — | Service name only | → |
| — | Not specified | leaf | Lua Embedded Application Framework | Ico Doornekamp | — | — | Service name only | → |
| — | Not specified | lexicon | Lexicon Vocabulary Sharing | Jacob Godwin-Jones | — | — | Service name only | → |
| — | Not specified | liaison | Liaison | Brian Cully | — | — | Service name only | → |
Look up a port number, service name, transport protocol, assignee or RFC in IANA's current registry. The table keeps every row in the 17 August 2026 snapshot, so one port can appear more than once when it has separate TCP, UDP or other registrations.
How to use the port lookup
Enter a number such as 22, 53, 80, 443, 3306 or 8080 to find exact registrations and any registered range containing that port. You can also search for a service such as ssh or mysql, a protocol, an assignee, or reference text such as RFC9110. Use the Protocol and Status filters when a search returns several rows.
Blank values mean the source registry does not provide that field. They have not been guessed. Assignee identifiers are resolved against the people and organisations directory in IANA's XML registry where a readable name is available.
Port ranges and status labels
- System ports: 0–1023. These are also commonly called well-known ports.
- User ports: 1024–49151. IANA can register services in this range.
- Dynamic or private ports: 49152–65535. IANA does not assign services from this range.
Status is a page-level label derived from the source row. Reserved and Unassigned follow IANA's description. Rows whose source text identifies a de-registration or removal are labelled Deprecated or removed. A row with a service name but no port is labelled Service name only. All other rows are labelled Assigned.
Why the same port can have several entries
TCP and UDP are different transport protocols, so the same number can be registered for both without representing the same network conversation. The registry also includes SCTP, DCCP, aliases, historic records and registrations without a specified transport protocol. They remain in this database so the source is not reduced to a hand-picked list.
Common port questions
What service normally uses port 22?
IANA registers ssh on port 22 for TCP and UDP, with an additional SCTP registration. In everyday networks, TCP port 22 is the familiar SSH remote-access service.
Why does port 53 show TCP and UDP?
The domain service is registered on port 53 for both TCP and UDP. DNS software chooses the transport according to the operation and response requirements.
What is the difference between ports 80 and 443?
IANA associates port 80 with HTTP-related service names and port 443 with HTTPS. A registration describes the conventional use; it does not inspect or guarantee the traffic running there.
What uses port 3306?
The registry lists mysql on port 3306 for TCP and UDP. MySQL client connections are ordinarily associated with TCP, but this page retains both official registry rows.
Is port 8080 always an HTTP proxy?
No. IANA registers http-alt on port 8080 for TCP and UDP, but applications can use ports differently. Identify the listening process and configuration before drawing a security conclusion.
Should I open a port because it is registered here?
No. Open only the ports required by a known application and restrict source networks where possible. A registry entry is not a firewall recommendation.
IANA updates the registry as assignments change. Use Report incorrect data if this snapshot no longer matches the official record, and include the IANA or RFC link so the change can be verified.
Provenance