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 |
|---|---|---|---|---|---|---|---|---|
| — | TCP | avatars-sec | Libravatar federated avatar hosting service. | libravatar.org | 2011-10-11 | — | Service name only | → |
| — | TCP | axis-nvr | Axis Network Video Recorders | Axis Communications AB | 2018-05-24 | — | Service name only | → |
| — | UDP | axis-nvr | Axis Network Video Recorders | Axis Communications AB | 2018-05-24 | — | Service name only | → |
| — | Not specified | axis-video | Axis Video Cameras | Kristina Sten | — | — | Service name only | → |
| — | UDP | autotunnel | IPSEC VPN tunnel over UDP | Stuart Cheshire | 2019-05-04 | [RFC6281] | Service name only | → |
| — | Not specified | b3d-convince | 3M Unitek Digital Orthodontic System | Rajiv Aaron Manglani | — | — | Service name only | → |
| — | Not specified | babyphone | BabyPhone | Johan Kool | — | — | Service name only | → |
| — | TCP | bandhelper-rc | Remote Control for BandHelper app | Arlo Leach | 2017-04-21 | — | Service name only | → |
| — | TCP | bandhelper-ss | Screen sharing for BandHelper app | Arlo Leach | 2017-04-21 | — | Service name only | → |
| — | TCP | barroomcomedy | Peer to peer file sharing for a media player application | Fred Zimmerman | 2013-11-05 | — | Service name only | → |
| — | TCP | bcloud-server | Buddycloud Server Delegation | buddycloud | 2014-06-19 | — | Service name only | → |
| — | Not specified | bdsk | BibDesk Sharing | Adam Maxwell | — | — | Service name only | → |
| — | Not specified | beacon | Beacon Remote Service | Jeffrey Sadeli | — | — | Service name only | → |
| — | Not specified | beamer | Beamer Data Sharing Protocol | Frank Szczerba | — | — | Service name only | → |
| — | Not specified | beatpack | BeatPack Synchronization Server for BeatMaker | Mathieu Garcia | — | — | Service name only | → |
| — | TCP | beatsdirect | Beats Direct allows for the discovery and control of devices | Beats Electronics LLC. | 2013-06-03 | — | Service name only | → |
| — | Not specified | beep | Xgrid Technology Preview | David Kramer | — | — | Service name only | → |
| — | TCP | behnke-cc | Behnke doorphones / emergency phones | Telefonbau Behnke GmbH | 2020-05-13 | — | Service name only | → |
| — | TCP | behnke-station | Behnke audio / video intercom systems | Telefonbau Behnke GmbH | 2021-03-17 | — | Service name only | → |
| — | TCP | behnke-video | Behnke doorphones / video intercoms | Telefonbau Behnke GmbH | 2021-03-17 | — | Service name only | → |
| — | Not specified | bender | Bender Communication Protocol | Bender GmbH & Co. KG | 2013-10-15 | — | Service name only | → |
| — | TCP | beyondidentity | Beyond Identity Platform Authenticator S | Beyond Identity Inc. | 2024-01-17 | — | Service name only | → |
| — | Not specified | bfagent | BuildForge Agent | Joe Senner | — | — | Service name only | → |
| — | TCP | bhipc | Becker & Hickl Inter Process Communication | Becker & Hickl GmbH | 2023-02-15 | — | Service name only | → |
| — | UDP | bhipc | Becker & Hickl Inter Process Communication | Becker & Hickl GmbH | 2023-02-15 | — | Service name only | → |
| — | TCP | bidib | Model Railway Control via netBiDiB | BiDiB & Tools e.V. | 2022-12-26 | — | Service name only | → |
| — | Not specified | bigbangchess | Big Bang Chess | Freeverse Software | — | — | Service name only | → |
| — | Not specified | bigbangmancala | Big Bang Mancala | Freeverse Software | — | — | Service name only | → |
| — | TCP | BioSonics | BioSonics Echosounders | BioSonics, Inc. | 2023-12-05 | — | Service name only | → |
| — | UDP | BioSonics | BioSonics Echosounders | BioSonics, Inc. | 2023-12-05 | — | Service name only | → |
| — | TCP | bitflit | Data transfer service | Ramesh Gupta | 2012-02-21 | — | Service name only | → |
| — | Not specified | bittorrent | BitTorrent Zeroconf Peer Discovery Protocol | Robin Perkins | — | — | Service name only | → |
| — | Not specified | blackbook | Little Black Book Information Exchange Protocol | David HM Spector; Paul M Franceus | — | — | Service name only | → |
| — | UDP | bluevertise | BlueVertise Network Protocol (BNP) | Fabrizio Guglielmino | — | — | Service name only | → |
| — | TCP | boardgame | Two-player board game play | Tianren Chen | 2026-08-05 | [https://github.com/chentianren0/MiniXiangqi/blob/main/docs/boardgame-protocol.md] | Service name only | → |
| — | TCP | boardplus | board plus application transfer protocol | CX5 SOFTWARE | 2013-02-04 | — | Service name only | → |
| — | TCP | booked-sync | Booked communication protocol - Sharing And Sync Service | Sören Havemester | 2013-02-18 | — | Service name only | → |
| — | Not specified | bookworm | Bookworm Client Discovery | Arne Dirks | — | — | Service name only | → |
| — | TCP | bootstrap | Bootstrap service discovery | Pedro Garcia | 2023-03-20 | — | Service name only | → |
| — | UDP | bootstrap | Bootstrap service discovery | Pedro Garcia | 2023-03-20 | — | Service name only | → |
| — | UDP | boundaryscan | Proprietary | Uwe Ziegler (Goepel electronic GmbH) | — | — | Service name only | → |
| — | Not specified | bousg | Bag Of Unusual Strategy Games | — | — | — | Service name only | → |
| — | TCP | boutfitness | Bout Fitness Synchronization Service | Bout Fitness, LLC | 2014-06-16 | — | Service name only | → |
| — | UDP | boutfitness | Bout Fitness Synchronization Service | Bout Fitness, LLC | 2014-06-16 | — | Service name only | → |
| — | TCP | boxraysrvr | Boxray Devices Host Server | Caprice Productions | 2012-07-05 | — | Service name only | → |
| — | TCP | bq-cromo | bq Cromo protocol | MUNDO READER SL | 2014-09-05 | — | Service name only | → |
| — | UDP | bq-cromo | bq Cromo protocol | MUNDO READER SL | 2014-09-05 | — | Service name only | → |
| — | TCP | breas | Breas | Breas Medical AB | 2015-09-09 | — | Service name only | → |
| — | UDP | breas | Breas | Breas Medical AB | 2015-09-09 | — | Service name only | → |
| — | Not specified | bri | RFID Reader Basic Reader Interface | Thaddeus Ternes | — | — | 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