Service Name and Transport Protocol Port Number Registry
Last Updated
- 2026-11-10
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 |
|---|---|---|---|---|---|---|---|---|---|---|---|
| discard | 9 | dccp | Discard | Eddie Kohler | Eddie Kohler | RFC 4340 | 1145656131 | ||||
| macon-tcp | 456 | tcp | macon-tcp | Yoshinobu Inoue | Yoshinobu Inoue | ||||||
| macon-udp | 456 | udp | macon-udp | Yoshinobu Inoue | Yoshinobu Inoue | ||||||
| dca | 1456 | tcp | DCA | Jeff Garbers | Jeff Garbers | ||||||
| dca | 1456 | udp | DCA | Jeff Garbers | Jeff Garbers | ||||||
| altav-remmgt | 2456 | tcp | altav-remmgt | Gary M. Allen | Gary M. Allen | ||||||
| altav-remmgt | 2456 | udp | altav-remmgt | Gary M. Allen | Gary M. Allen | ||||||
| vat | 3456 | tcp | VAT default data | Van Jacobson | Van Jacobson | ||||||
| vat | 3456 | udp | VAT default data | Van Jacobson | Van Jacobson | ||||||
| prchat-server | 4456 | tcp | PR Chat Server | ||||||||
| prchat-server | 4456 | udp | PR Chat Server | ||||||||
| 4560-4562 | Unassigned | ||||||||||
| amahi-anywhere | 4563 | tcp | Amahi Anywhere | Amahi | Carlos Puchol | 2014-02-27 | |||||
| 4563 | udp | Reserved | |||||||||
| 4564-4565 | Unassigned | ||||||||||
| kwtc | 4566 | tcp | Kids Watch Time Control Service | Larry Zarou | Larry Zarou | 2006-10 | |||||
| kwtc | 4566 | udp | Kids Watch Time Control Service | Larry Zarou | Larry Zarou | 2006-10 | |||||
| tram | 4567 | tcp | TRAM | Joe Wesley | Joe Wesley | ||||||
| tram | 4567 | udp | TRAM | Joe Wesley | Joe Wesley | ||||||
| bmc-reporting | 4568 | tcp | BMC Reporting | Portnoy Boxman | Portnoy Boxman | ||||||
| bmc-reporting | 4568 | udp | BMC Reporting | Portnoy Boxman | Portnoy Boxman | ||||||
| iax | 4569 | tcp | Inter-Asterisk eXchange | Benjamin Kowarsch | Benjamin Kowarsch | RFC 5456 | Defined TXT keys: auth plaintext | md5 | rsakeys userid alphanumeric, additionally '_', '+', '-' secret any printable ASCII characters domain any DNS domain name or IP address extension alphanumeric, additionally '*', '#', '_', '+', '-' context alphanumeric, additionally '_', '+', '-' trunk yes | no | 0 | 1 welcome alphanumeric, additionally '*', '#', '_', '+', '-' voicemail alphanumeric, additionally '*', '#', '_', '+', '-' reception alphanumeric, additionally '*', '#', '_', '+', '-' echotest alphanumeric, additionally '*', '#', '_', '+', '-' ivrtest alphanumeric, additionally '*', '#', '_', '+', '-' All of these TXT record keys are optional, they may be omitted. Further keys may be added in the future. |
||||
| iax | 4569 | udp | Inter-Asterisk eXchange | Benjamin Kowarsch | Benjamin Kowarsch | RFC 5456 | Defined TXT keys: auth plaintext | md5 | rsakeys userid alphanumeric, additionally '_', '+', '-' secret any printable ASCII characters domain any DNS domain name or IP address extension alphanumeric, additionally '*', '#', '_', '+', '-' context alphanumeric, additionally '_', '+', '-' trunk yes | no | 0 | 1 welcome alphanumeric, additionally '*', '#', '_', '+', '-' voicemail alphanumeric, additionally '*', '#', '_', '+', '-' reception alphanumeric, additionally '*', '#', '_', '+', '-' echotest alphanumeric, additionally '*', '#', '_', '+', '-' ivrtest alphanumeric, additionally '*', '#', '_', '+', '-' All of these TXT record keys are optional, they may be omitted. Further keys may be added in the future. |
||||
| apc-5456 | 5456 | tcp | APC 5456 | American Power Conversion | American Power Conversion | ||||||
| apc-5456 | 5456 | udp | APC 5456 | American Power Conversion | American Power Conversion | ||||||
| skip-cert-send | 6456 | tcp | SKIP Certificate Send | Tom Markson | Tom Markson | ||||||
| skip-cert-send | 6456 | udp | SKIP Certificate Send | Tom Markson | Tom Markson | ||||||
| 8451-8456 | Unassigned | ||||||||||
| aequus | 23456 | tcp | Aequus Service | James Anson | James Anson | 2009-02-12 | |||||
| 23456 | udp | Reserved | |||||||||
| 31417-31456 | Unassigned | ||||||||||
| 34380-34566 | Unassigned | ||||||||||
| dhanalakshmi | 34567 | tcp | dhanalakshmi.org EDI Service | Girish Gopalakrishnan | Girish Gopalakrishnan | 2010-04-20 | |||||
| edi_service | 34567 | udp | dhanalakshmi.org EDI Service | Girish Gopalakrishnan | Girish Gopalakrishnan | 2016-10-26 | |||||
| 34568-34961 | Unassigned | ||||||||||
| 45515-45677 | Unassigned | ||||||||||
| eba | 45678 | tcp | EBA PRISE | Patrick Kara | Patrick Kara | ||||||
| eba | 45678 | udp | EBA PRISE | Patrick Kara | Patrick Kara | ||||||
| 45679-45823 | Unassigned |
Contact Information
| Name | Organization | Contact URI | Last Updated |
|---|---|---|---|
| Amahi | iana&amahi.org | 2014-02-27 | |
| American Power Conversion | ports&apcc.com | 2002-02 | |
| Benjamin Kowarsch | benjamin&sunrise-tel.com | 2004-11 | |
| Carlos Puchol | Amahi | iana&amahi.org | 2014-02-27 |
| Eddie Kohler | IETF dccp WG | kohler&cs.ucla.edu | |
| Gary M. Allen | gallen&symantec.com | ||
| Girish Gopalakrishnan | girish&shankar-software.org | 2016-10-26 | |
| James Anson | janson&bigpond.com | 2009-02-12 | |
| Jeff Garbers | jgarbers&netcom.com | ||
| Joe Wesley | joe.wesley&east.sun.com | ||
| Larry Zarou | zarla01&cbsits.com | 2006-10 | |
| Patrick Kara | Patrick&eba.net | ||
| Portnoy Boxman | portnoy_boxman&bmc.com | 2005-01 | |
| Tom Markson | markson&osmosys.incog.com | ||
| Van Jacobson | van&ee.lbl.gov | ||
| Yoshinobu Inoue |