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 | cpnotebook2 | NoteBook 2 | Circus Ponies Support | — | — | Service name only | → |
| — | TCP | csi-mmws | Canfield Scientific Inc - Mirror Mobile Web Services | Canfield Scientific, Inc. | 2013-07-02 | — | Service name only | → |
| — | Not specified | cw-codetap | CodeWarrior HTI Xscale PowerTAP | Ted Woodward | — | — | Service name only | → |
| — | Not specified | cw-dpitap | CodeWarrior HTI DPI PowerTAP | Ted Woodward | — | — | Service name only | → |
| — | Not specified | cw-oncetap | CodeWarrior HTI OnCE PowerTAP | Ted Woodward | — | — | Service name only | → |
| — | Not specified | cw-powertap | CodeWarrior HTI COP PowerTAP | Ted Woodward | — | — | Service name only | → |
| — | Not specified | cytv | CyTV - Network streaming for Elgato EyeTV | Andreas Junghans | — | — | Service name only | → |
| — | Not specified | dacp | Digital Audio Control Protocol (iTunes) | Amandeep Jawa | — | — | Service name only | → |
| — | Not specified | dancepartner | Dance partner application for iPhone | Rory McClure | — | — | Service name only | → |
| — | TCP | darkhorsetimer | Timer LAN service | Dark Horse GmbH & Co KG | 2015-06-02 | — | Service name only | → |
| — | Not specified | dataturbine | Open Source DataTurbine Streaming Data Middleware | Tony Fountain | — | — | Service name only | → |
| — | TCP | dbaudio | d&b audiotechnik remote network | d&b audiotechnik | 2011-10-06 | — | Service name only | → |
| — | UDP | dbaudio | d&b audiotechnik remote network | d&b audiotechnik | 2011-10-06 | — | Service name only | → |
| — | DCCP | dccp-ping | ping/traceroute using DCCP | Samuel Jero | 2012-11-14 | — | Service name only | → |
| — | TCP | dell-soo-ds | Spotlight on Oracle Diagnostic Server | Dell | 2013-10-03 | — | Service name only | → |
| — | UDP | dell-soo-ds | Spotlight on Oracle Diagnostic Server | Dell | 2013-10-03 | — | Service name only | → |
| — | TCP | dell-soss-ds-w | Spotlight on SQL Server Diagnostic Server HTTP | Dell | 2013-10-03 | — | Service name only | → |
| — | TCP | dell-ssms-ds | Spotlight SSMS Plugin Diagnostic Server | Dell | 2013-10-03 | — | Service name only | → |
| — | TCP | demoncamremote | Peer-to-peer real-time video streaming | James Alan Bush | 2017-09-26 | — | Service name only | → |
| — | UDP | demoncamremote | Peer-to-peer real-time video streaming | James Alan Bush | 2017-09-26 | — | Service name only | → |
| — | Not specified | device-info | Device Info | Stuart Cheshire; Marc Krochmal | — | — | Service name only | → |
| — | TCP | devonsync | DEVONthink synchronization protocol | DEVONtechnologies, LLC | 2011-10-18 | — | Service name only | → |
| — | TCP | dhanda-g | DHANDAg is going for a site | DHANDAg | 2017-12-29 | — | Service name only | → |
| — | UDP | dhanda-g | DHANDAg is going for a site | DHANDAg | 2017-12-29 | — | Service name only | → |
| — | SCTP | dhanda-g | DHANDAg is going for a site | DHANDAg | 2017-12-29 | — | Service name only | → |
| — | Not specified | dictation | Use of a dictation service by a hand-held device | Nuance Communications, Inc. | 2011-10-27 | — | Service name only | → |
| — | Not specified | difi | EyeHome | Elgato | — | — | Service name only | → |
| — | TCP | digitalelectric | Digital Electricity Transmitter | VoltServer, Inc | 2025-07-21 | — | Service name only | → |
| — | Not specified | disconnect | DisConnect Peer to Peer Game Protocol | Michael S. Bogovich | — | — | Service name only | → |
| — | TCP | displaysrc | Wi-Fi Alliance Display Source service | Wi-Fi Alliance | 2017-03-14 | — | Service name only | → |
| — | Not specified | dist-opencl | Distributed OpenCL discovery protocol | William Dillon | — | — | Service name only | → |
| — | Not specified | ditrios | Ditrios SOA Framework Protocol | Mark Schmatz | — | — | Service name only | → |
| — | Not specified | divelogsync | Dive Log Data Sharing and Synchronization Protocol | Greg McLaughlin | — | — | Service name only | → |
| — | TCP | dlpx-sp | Delphix Session Protocol | Delphix Corp | 2012-10-02 | — | Service name only | → |
| — | UDP | dltimesync | Local Area Dynamic Time Synchronisation Protocol | Geoff Back | — | — | Service name only | → |
| — | TCP | dns-llq-tls | DNS Long-Lived Queries over TLS | Stuart Cheshire | 2019-05-04 | [RFC6281] | Service name only | → |
| — | TCP | dns-push-tls | DNS Push Notification Service Type | IESG | 2019-11-25 | [RFC8765, Section 6.1] | Service name only | → |
| — | TCP | dns-query-tls | DNS queries to the authoritative server over TLS | Stuart Cheshire | 2019-05-04 | — | Service name only | → |
| — | Not specified | dns-sd | DNS Service Discovery | Stuart Cheshire; Marc Krochmal | — | — | Service name only | → |
| — | TCP | dns-update | DNS Dynamic Update Service | Stuart Cheshire | 2019-05-04 | — | Service name only | → |
| — | UDP | dns-update | DNS Dynamic Update Service | Stuart Cheshire | — | — | Service name only | → |
| — | TCP | dns-update-tls | DNS Dynamic Update Service over TLS | Stuart Cheshire | 2019-05-04 | [RFC6281] | Service name only | → |
| — | TCP | dnssd-srp | DNS-Based Service Discovery | IESG | 2024-04-12 | [RFC9665] | Service name only | → |
| — | TCP | dnssd-srp-tls | DNS-Based Service Discovery (TLS) | IESG | 2024-04-12 | [RFC9665] | Service name only | → |
| — | Not specified | dop | Roar (Death of Productivity) | Massive Flow Productions | — | — | Service name only | → |
| — | TCP | dots-call-home | DOTS Signal Channel Call Home Protocol. The service name is used to construct the SRV service names "_dots-call-home._udp" and "_dots-call-home._tcp" for discovering Call Home DOTS clients used to establish DOTS signal channel call home. | IESG | 2020-11-19 | [RFC8973] | Service name only | → |
| — | UDP | dots-call-home | DOTS Signal Channel Call Home Protocol. The service name is used to construct the SRV service names "_dots-call-home._udp" and "_dots-call-home._tcp" for discovering Call Home DOTS clients used to establish DOTS signal channel call home. | IESG | 2020-11-19 | [RFC8973] | Service name only | → |
| — | TCP | dots-data | DOTS Data Channel Protocol. The service name is used to construct the SRV service name "_dots-data._tcp" for discovering DOTS servers used to establish DOTS data channel. | IESG | 2020-11-19 | [RFC8973] | Service name only | → |
| — | Not specified | dropcopy | DropCopy | 10base-t Interactive | — | — | Service name only | → |
| — | Not specified | dsgsync | Datacolor SpyderGallery Desktop Sync Protocol | Datacolor | 2011-10-14 | — | 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