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 |
|---|---|---|---|---|---|---|---|---|---|---|---|
| bftp | 152 | tcp | Background File Transfer Program | Annette DeSchon | Annette DeSchon | ||||||
| bftp | 152 | udp | Background File Transfer Program | Annette DeSchon | Annette DeSchon | ||||||
| winpoplanmess | 1152 | tcp | Winpopup LAN Messenger | Vitali Fomine | Vitali Fomine | 2005-11 | |||||
| winpoplanmess | 1152 | udp | Winpopup LAN Messenger | Vitali Fomine | Vitali Fomine | 2005-11 | |||||
| atm-zip-office | 1520 | tcp | atm zip office | Wilson Kwan | Wilson Kwan | ||||||
| atm-zip-office | 1520 | udp | atm zip office | Wilson Kwan | Wilson Kwan | ||||||
| ncube-lm | 1521 | tcp | nCube License Manager | Maxine Yuen | Maxine Yuen | 2022-02-14 | Unauthorized Use Known on port 1521 | ||||
| ncube-lm | 1521 | udp | nCube License Manager | Maxine Yuen | Maxine Yuen | 2022-02-14 | Unauthorized Use Known on port 1521 | ||||
| ricardo-lm | 1522 | tcp | Ricardo North America License Manager | Mike Flemming | Mike Flemming | ||||||
| ricardo-lm | 1522 | udp | Ricardo North America License Manager | Mike Flemming | Mike Flemming | ||||||
| cichild-lm | 1523 | tcp | cichild | Andy Burgess | Andy Burgess | ||||||
| cichild-lm | 1523 | udp | cichild | Andy Burgess | Andy Burgess | ||||||
| ingreslock | 1524 | tcp | ingres | ||||||||
| ingreslock | 1524 | udp | ingres | ||||||||
| orasrv | 1525 | tcp | oracle | ||||||||
| orasrv | 1525 | udp | oracle | ||||||||
| prospero-np | 1525 | tcp | Prospero Directory Service non-priv | ||||||||
| prospero-np | 1525 | udp | Prospero Directory Service non-priv | ||||||||
| pdap-np | 1526 | tcp | Prospero Data Access Prot non-priv | B. Clifford Neuman | B. Clifford Neuman | ||||||
| pdap-np | 1526 | udp | Prospero Data Access Prot non-priv | B. Clifford Neuman | B. Clifford Neuman | ||||||
| tlisrv | 1527 | tcp | oracle | ||||||||
| tlisrv | 1527 | udp | oracle | ||||||||
| norp | 1528 | tcp | Not Only a Routeing Protocol | nyantec | Mikael Voss | 2021-04-07 | |||||
| norp | 1528 | udp | Not Only a Routeing Protocol | nyantec | Mikael Voss | 2016-09-13 | 2021-04-07 | ||||
| norp | 1528 | sctp | Not Only a Routeing Protocol | nyantec | Mikael Voss | 2021-04-07 | |||||
| coauthor | 1529 | tcp | oracle | ||||||||
| coauthor | 1529 | udp | oracle | ||||||||
| gtp-user | 2152 | tcp | GTP-User Plane (3GPP) | Alessio Casati | Alessio Casati | ||||||
| gtp-user | 2152 | udp | GTP-User Plane (3GPP) | Alessio Casati | Alessio Casati | ||||||
| feitianrockey | 3152 | tcp | FeiTian Port | Huang Yu | Huang Yu | ||||||
| feitianrockey | 3152 | udp | FeiTian Port | Huang Yu | Huang Yu | ||||||
| idig-mux | 4152 | tcp | iDigTech Multiplex IANA assigned this well-formed service name as a replacement for "idig_mux". |
Robin Findley | Robin Findley | 2007-05 | |||||
| idig_mux | 4152 | tcp | iDigTech Multiplex | Robin Findley | Robin Findley | 2007-05 | This entry is an alias to "idig-mux". This entry is now historic, not usable for use with many common service discovery mechanisms. | ||||
| idig-mux | 4152 | udp | iDigTech Multiplex IANA assigned this well-formed service name as a replacement for "idig_mux". |
Robin Findley | Robin Findley | 2007-05 | |||||
| idig_mux | 4152 | udp | iDigTech Multiplex | Robin Findley | Robin Findley | 2007-05 | This entry is an alias to "idig-mux". This entry is now historic, not usable for use with many common service discovery mechanisms. | ||||
| esri-sde | 5151 | tcp | ESRI SDE Instance IANA assigned this well-formed service name as a replacement for "esri_sde". |
Peter Aronson | Peter Aronson | Unauthorized Use Known on ports 5151 and 5152 | |||||
| esri-sde | 5151 | udp | ESRI SDE Remote Start IANA assigned this well-formed service name as a replacement for "esri_sde". |
Peter Aronson | Peter Aronson | Unauthorized Use Known on ports 5151 and 5152 | |||||
| sde-discovery | 5152 | tcp | ESRI SDE Instance Discovery | Peter Aronson | Peter Aronson | Unauthorized Use Known on ports 5151 and 5152 | |||||
| sde-discovery | 5152 | udp | ESRI SDE Instance Discovery | Peter Aronson | Peter Aronson | Unauthorized Use Known on ports 5151 and 5152 | |||||
| 8150-8152 | Unassigned |
Contact Information
| Name | Organization | Contact URI | Last Updated |
|---|---|---|---|
| Alessio Casati | a.casati&computer.org | ||
| Andy Burgess | aab&cichlid.com | ||
| Annette DeSchon | DESCHON&isi.edu | ||
| B. Clifford Neuman | bcn&isi.edu | 2022-02-18 | |
| Huang Yu | llw&ftsafe.com | ||
| Maxine Yuen | maxine&hq.ncube.com | ||
| Mike Flemming | mf&xnet.com | ||
| Mikael Voss | mvs&nyantec.com | 2017-04-18 | |
| nyantec | info&nyantec.com | 2017-04-18 | |
| Peter Aronson | paronson&esri.com | ||
| Robin Findley | rfindley&usa.net | 2007-05 | |
| Vitali Fomine | info&winpopup-lan-messenger.com | 2005-11 | |
| Wilson Kwan | wilsonk%25toronto@zip.atm.com |