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 | trunk-2 | Trunk-2 Protocol | — | — | — | Service name only | → |
| — | Not specified | ucl | University College London Protocol | — | — | — | Service name only | → |
| — | Not specified | udp | User Datagram Protocol | — | — | — | Service name only | → |
| — | Not specified | users | Active Users Protocol | — | — | — | Service name only | → |
| — | Not specified | via-ftp | VIA Systems-File Transfer Protocol | — | — | — | Service name only | → |
| — | Not specified | visa | VISA Protocol | — | — | — | Service name only | → |
| — | Not specified | vmtp | Versatile Message Transaction Protocol | — | — | — | Service name only | → |
| — | Not specified | wb-expak | Wideband EXPAK | — | — | — | Service name only | → |
| — | Not specified | wb-mon | Wideband Monitoring | — | — | — | Service name only | → |
| — | Not specified | xnet | Cross Net Debugger | — | — | — | Service name only | → |
| — | Not specified | xns-idp | Xerox NS IDP | — | — | — | Service name only | → |
| — | Not specified | 1password | 1Password Password Manager data sharing and synchronization protocol | Roustem Karimov | — | — | Service name only | → |
| — | TCP | 7ksonar | Teledyne Marine 7k Sonar Protocol | Teledyne Marine | 2023-10-03 | — | Service name only | → |
| — | UDP | 7ksonar | Teledyne Marine 7k Sonar Protocol | Teledyne Marine | 2023-10-03 | — | Service name only | → |
| — | Not specified | a-d-sync | Altos Design Synchronization protocol | David Lasker | — | — | Service name only | → |
| — | Not specified | abi-instrument | Applied Biosystems Universal Instrument Framework | ThermoFisher Scientific | — | — | Service name only | → |
| — | TCP | ab-secure | AB Secure Protocol | Saso Ahmed | 2026-05-29 | — | Service name only | → |
| — | UDP | ab-secure | AB Secure Protocol | Saso Ahmed | 2026-05-29 | — | Service name only | → |
| — | Not specified | accessdata-f2d | FTK2 Database Discovery Service | Rick Russell | — | — | Service name only | → |
| — | Not specified | accessdata-f2w | FTK2 Backend Processing Agent Service | Rick Russell | — | — | Service name only | → |
| — | Not specified | accessone | Strix Systems 5S/AccessOne protocol | Scott Herscher | — | — | Service name only | → |
| — | Not specified | accountedge | MYOB AccountEdge | — | — | — | Service name only | → |
| — | Not specified | acrobatsrv | Adobe Acrobat | — | — | — | Service name only | → |
| — | TCP | acs-ctl-ds | Access Control Device | Honeywell Security Group | 2012-04-09 | — | Service name only | → |
| — | UDP | acs-ctl-ds | Access Control Device | Honeywell Security Group | 2012-04-09 | — | Service name only | → |
| — | TCP | acs-ctl-gw | Access Control Gateway | Honeywell Security Group | 2012-04-09 | — | Service name only | → |
| — | UDP | acs-ctl-gw | Access Control Gateway | Honeywell Security Group | 2012-04-09 | — | Service name only | → |
| — | TCP | acsp-server | AXIS Camera Station Pro Server | Axis Communications | 2024-04-19 | — | Service name only | → |
| — | Not specified | actionitems | ActionItems | Sailalong Software | — | — | Service name only | → |
| — | Not specified | activeraid | Active Storage Proprietary Device Management Protocol | Skip Levens | — | — | Service name only | → |
| — | Not specified | activeraid-ssl | Encrypted transport of Active Storage Proprietary Device Management Protocol | Skip Levens | — | — | Service name only | → |
| — | TCP | adamhall | Adam Hall network control and monitoring | Adam Hall Group | 2022-07-15 | — | Service name only | → |
| — | UDP | adamhall | Adam Hall network control and monitoring | Adam Hall Group | 2022-07-15 | — | Service name only | → |
| — | TCP | adaptive-rn | ARN (Adaptive Routing Notification) is a protocol designed to enable dynamic routing adjustments by sharing network status information between nodes in data center networks, improving efficiency and fault tolerance. | Hongyi Huang | 2024-11-22 | — | Service name only | → |
| — | UDP | adaptive-rn | ARN (Adaptive Routing Notification) is a protocol designed to enable dynamic routing adjustments by sharing network status information between nodes in data center networks, improving efficiency and fault tolerance. | Hongyi Huang | 2024-11-22 | — | Service name only | → |
| — | Not specified | addressbook | Address-O-Matic | Massimiliano Ribuoli and Marco Stefani | — | — | Service name only | → |
| — | TCP | addressbooksrv | Address Book Server used for contacts and calendar synchronisation | AddressBookServer.com | 2011-10-14 | — | Service name only | → |
| — | Not specified | adnodes | difusi Cloud based plug & play network synchronization protocol, content pool database discovery, and cloudOS SAaS discovery protocol. | DIFUSI, Inc. | 2011-11-07 | — | Service name only | → |
| — | TCP | adobe-shadow | Adobe Shadow Server | Adobe Systems Inc. | 2012-04-17 | — | Service name only | → |
| — | Not specified | adobe-vc | Adobe Version Cue | — | — | — | Service name only | → |
| — | Not specified | adisk | Automatic Disk Discovery | Bob Bradley | — | — | Service name only | → |
| — | Not specified | adpro-setup | ADPRO Security Device Setup | Patrick Noffke | — | — | Service name only | → |
| — | Not specified | aecoretech | Apple Application Engineering Services | Hani Abdelazim | — | — | Service name only | → |
| — | Not specified | aeroflex | Aeroflex instrumentation and software | David Hagood | — | — | Service name only | → |
| — | TCP | aerohive-proxy | Aerohive Proxy Configuration Service | Aerohive Networks | 2012-05-31 | — | Service name only | → |
| — | TCP | affinity-docs0 | Affinity Designer document sharing | Serif (Europe) Ltd. | 2023-03-30 | — | Service name only | → |
| — | TCP | affinity-docs1 | Affinity Photo document sharing | Serif (Europe) Ltd. | 2023-03-30 | — | Service name only | → |
| — | TCP | affinity-docs2 | Affinity Publisher document sharing | Serif (Europe) Ltd. | 2023-03-30 | — | Service name only | → |
| — | TCP | affinity-cntent | Affinity content sharing | Serif (Europe) Ltd. | 2023-03-30 | — | Service name only | → |
| — | TCP | ai-adp | AI Agent Discovery Protocol (ADP) | Harry Lian | 2026-06-12 | [draft-pro-adp-agent-discovery-00] | 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