Service Name and Transport Protocol Port Number Registry
Last Updated
- 2026-10-15
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 |
|---|---|---|---|---|---|---|---|---|---|---|---|
| qmtp | 209 | tcp | The Quick Mail Transfer Protocol | D. J. Bernstein | D. J. Bernstein | 2018-04-05 | |||||
| qmtp | 209 | udp | The Quick Mail Transfer Protocol | D. J. Bernstein | D. J. Bernstein | 2018-04-05 | |||||
| ipcd3 | 1209 | tcp | IPCD3 | Mark Ciskey | Mark Ciskey | ||||||
| ipcd3 | 1209 | udp | IPCD3 | Mark Ciskey | Mark Ciskey | ||||||
| lrp | 2090 | tcp | Load Report Protocol | Amir Peless | Amir Peless | ||||||
| lrp | 2090 | udp | Load Report Protocol | Amir Peless | Amir Peless | ||||||
| prp | 2091 | tcp | PRP | Amir Peless | Amir Peless | ||||||
| prp | 2091 | udp | PRP | Amir Peless | Amir Peless | ||||||
| descent3 | 2092 | tcp | Descent 3 | Kevin Bentley | Kevin Bentley | ||||||
| descent3 | 2092 | udp | Descent 3 | Kevin Bentley | Kevin Bentley | ||||||
| nbx-cc | 2093 | tcp | NBX CC | ||||||||
| nbx-cc | 2093 | udp | NBX CC | ||||||||
| nbx-au | 2094 | tcp | NBX AU | ||||||||
| nbx-au | 2094 | udp | NBX AU | ||||||||
| nbx-ser | 2095 | tcp | NBX SER | ||||||||
| nbx-ser | 2095 | udp | NBX SER | ||||||||
| nbx-dir | 2096 | tcp | NBX DIR | Henry Houh | Henry Houh | ||||||
| nbx-dir | 2096 | udp | NBX DIR | Henry Houh | Henry Houh | ||||||
| jetformpreview | 2097 | tcp | Jet Form Preview | Zygmunt Wiercioch | Zygmunt Wiercioch | ||||||
| jetformpreview | 2097 | udp | Jet Form Preview | Zygmunt Wiercioch | Zygmunt Wiercioch | ||||||
| dialog-port | 2098 | tcp | Dialog Port | Joseph Mathew | Joseph Mathew | ||||||
| dialog-port | 2098 | udp | Dialog Port | Joseph Mathew | Joseph Mathew | ||||||
| h2250-annex-g | 2099 | tcp | H.225.0 Annex G Signalling | ITU-T | ITU-T TSB | 2013-01-31 | |||||
| h2250-annex-g | 2099 | udp | H.225.0 Annex G Signalling | ITU-T | ITU-T TSB | 2013-01-31 | |||||
| rimf-ps | 2209 | tcp | HP RIM for Files Portal Service | Patty Ho | Patty Ho | 2007-05 | |||||
| rimf-ps | 2209 | udp | HP RIM for Files Portal Service | Patty Ho | Patty Ho | 2007-05 | |||||
| netwkpathengine | 3209 | tcp | HP OpenView Network Path Engine Server | Anthony Walker | Anthony Walker | ||||||
| netwkpathengine | 3209 | udp | HP OpenView Network Path Engine Server | Anthony Walker | Anthony Walker | ||||||
| nomad | 5209 | tcp | Nomad Device Video Transfer | Morega Systems Inc. | Ashraf Tahir | 2012-08-20 | |||||
| 5209 | udp | Reserved | |||||||||
| qmtps | 6209 | tcp | QMTP over TLS | FEHCom | Erwin Hoffmann | 2015-01-09 | |||||
| qmtps | 6209 | udp | QMTP over TLS | FEHCom | Erwin Hoffmann | 2015-01-09 | |||||
| 8209-8210 | Unassigned | ||||||||||
| almobile-system | 9209 | tcp | ALMobile System Service | Rob Graber | Rob Graber | 2006-01 | |||||
| almobile-system | 9209 | udp | ALMobile System Service | Rob Graber | Rob Graber | 2006-01 | |||||
| 11209-11210 | Unassigned | ||||||||||
| 20811-20998 | Unassigned | ||||||||||
| athand-mmp | 20999 | tcp | At Hand MMP | Stepan Riha | Stepan Riha | ||||||
| athand-mmp | 20999 | udp | AT Hand MMP | Stepan Riha | Stepan Riha | ||||||
| 26209-26256 | Unassigned | ||||||||||
| 43192-43209 | Unassigned |
Contact Information
| Name | Organization | Contact URI | Last Updated |
|---|---|---|---|
| Amir Peless | amirp&radware.co.il | ||
| Anthony Walker | anthony_walker&hp.com | 2002-03 | |
| Ashraf Tahir | Morega Systems Inc. | atahir&morega.com | 2012-08-20 |
| D. J. Bernstein | ports&box.cr.yp.to | 2018-04-05 | |
| Erwin Hoffmann | FEHCom | feh&fehcom.de | 2015-01-09 |
| FEHCom | feh&fehcom.de | 2015-01-09 | |
| Henry Houh | hhouh&nbxcorp.com | ||
| ITU-T | tsbsg16&itu.int | 2013-01-31 | |
| ITU-T TSB | ITU-T | tsbsg16&itu.int | 2013-01-31 |
| Joseph Mathew | mjoseph&dosa.cisco.com | ||
| Kevin Bentley | Kevin&outrage.com | ||
| Mark Ciskey | mlciskey&plato.com | ||
| Morega Systems Inc. | atahir&morega.com | 2012-08-20 | |
| Patty Ho | rimf&core.rose.hp.com | 2007-05 | |
| Rob Graber | r.graber&austinlane.com | 2006-01 | |
| Stepan Riha | stepan.riha&hand.com | ||
| Zygmunt Wiercioch | zyg&jetform.com |