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 |
|---|---|---|---|---|---|---|---|---|---|---|---|
| 4189 | udp | Reserved | RFC 5440 | ||||||||
| sieve | 4190 | tcp | ManageSieve Protocol | ||||||||
| 4190 | udp | Reserved | RFC 5804 | ||||||||
| 4191 | tcp | Reserved | |||||||||
| dsmipv6 | 4191 | udp | Dual Stack MIPv6 NAT Traversal | RFC 5555 | |||||||
| azeti | 4192 | tcp | Azeti Agent Service | Uwe Holz | Uwe Holz | 2009-11-09 | |||||
| azeti-bd | 4192 | udp | azeti blinddate | Michael Werski | Michael Werski | 2010-02-18 | |||||
| pvxplusio | 4193 | tcp | PxPlus remote file srvr | Mike King | Mike King | 2009-11-09 | |||||
| 4193 | udp | Reserved | |||||||||
| spdm | 4194 | tcp | Security Protocol and Data Model | DMTF Administration | Robert Keyes | 2022-01-10 | 2025-05-30 | ||||
| 4194 | udp | Reserved | |||||||||
| aws-wsp | 4195 | tcp | AWS protocol for cloud remoting solution | Amazon.com Services LLC | Lauren Townsend | 2020-04-06 | |||||
| aws-wsp | 4195 | udp | AWS protocol for cloud remoting solution | Amazon.com Services LLC | Lauren Townsend | 2020-04-06 | |||||
| aws-wsp | 4195 | sctp | AWS protocol for cloud remoting solution | Amazon.com Services LLC | Lauren Townsend | 2020-04-06 | |||||
| aws-wsp | 4195 | dccp | AWS protocol for cloud remoting solution | Amazon.com Services LLC | Lauren Townsend | 2020-04-06 | |||||
| 4196 | Unassigned | ||||||||||
| hctl | 4197 | tcp | Harman HControl Protocol | Harman International Industries Inc. | Darin Smith | 2017-02-16 | |||||
| hctl | 4197 | udp | Harman HControl Protocol | Harman International Industries Inc. | Darin Smith | 2017-02-16 | |||||
| 4198 | Unassigned | ||||||||||
| eims-admin | 4199 | tcp | EIMS ADMIN | Glenn Anderson | Glenn Anderson | ||||||
| eims-admin | 4199 | udp | EIMS ADMIN | Glenn Anderson | Glenn Anderson | ||||||
| vrml-multi-use | 4200-4299 | VRML Multi User Systems | Mitra | Mitra | |||||||
| dserver | 4309 | tcp | Exsequi Appliance Discovery | Angelo Masci | Angelo Masci | 2007-01 | |||||
| dserver | 4309 | udp | Exsequi Appliance Discovery | Angelo Masci | Angelo Masci | 2007-01 | |||||
| skytale | 4319 | tcp | Sentyron SkyTale encrypted communication | Sentyron B.V. | Mark Revier | 2022-01-20 | 2025-10-30 | ||||
| skytale | 4319 | udp | Sentyron SkyTale encrypted communication | Sentyron B.V. | Mark Revier | 2022-01-20 | 2025-10-30 | ||||
| publiqare-sync | 4329 | tcp | PubliQare Distributed Environment Synchronisation Engine | Tom Maaswinkel | Tom Maaswinkel | 2011-02-07 | |||||
| 4329 | udp | Reserved | |||||||||
| 4337-4339 | Unassigned | ||||||||||
| lisp-data | 4341 | udp | LISP Data Packets | IESG | IETF Chair | 2007-11-12 | 2021-02-17 | RFC 9300 | |||
| lisp-control | 4342 | udp | LISP Control Packets | IETF | IESG | 2007-05 | 2021-02-25 | RFC 9301 | |||
| fsportmap | 4349 | tcp | File System Port Map | Ron Minnich | Ron Minnich | ||||||
| fsportmap | 4349 | udp | File System Port Map | Ron Minnich | Ron Minnich | ||||||
| omabcastltkm | 4359 | tcp | OMA BCAST Long-Term Key Messages | Frank Hartung | Frank Hartung | 2007-09-07 | |||||
| omabcastltkm | 4359 | udp | OMA BCAST Long-Term Key Messages | Frank Hartung | Frank Hartung | 2007-09-07 | |||||
| epmd | 4369 | tcp | Erlang Port Mapper Daemon | Erlang/OTP support | Erlang/OTP support | ||||||
| epmd | 4369 | udp | Erlang Port Mapper Daemon | Erlang/OTP support | Erlang/OTP support | ||||||
| ctdb | 4379 | tcp | CTDB | Ronnie Sahlberg | Ronnie Sahlberg | 2007-07-05 | |||||
| ctdb | 4379 | udp | CTDB | Ronnie Sahlberg | Ronnie Sahlberg | 2007-07-05 | |||||
| xandros-cms | 4389 | tcp | Xandros Community Management Service | Stephen M. Webb | Stephen M. Webb | 2007-05 | |||||
| xandros-cms | 4389 | udp | Xandros Community Management Service | Stephen M. Webb | Stephen M. Webb | 2007-05 | |||||
| wiegand | 4390 | tcp | Physical Access Control | Scott Guthery | Scott Guthery | 2008-08-25 | |||||
| wiegand | 4390 | udp | Physical Access Control | Scott Guthery | Scott Guthery | 2008-08-25 | |||||
| apwi-imserver | 4391 | tcp | American Printware IMServer Protocol | Lech Lakomy | Lech Lakomy | 2009-02-12 | |||||
| 4391 | udp | Reserved | |||||||||
| apwi-rxserver | 4392 | tcp | American Printware RXServer Protocol | Lech Lakomy | Lech Lakomy | 2009-02-12 | |||||
| 4392 | udp | Reserved | |||||||||
| apwi-rxspooler | 4393 | tcp | American Printware RXSpooler Protocol | Lech Lakomy | Lech Lakomy | 2009-02-12 | |||||
| 4393 | udp | Reserved | |||||||||
| 4394 | tcp | Reserved | |||||||||
| apwi-disc | 4394 | udp | American Printware Discovery | Lech Lakomy | Lech Lakomy | 2009-02-12 | |||||
| omnivisionesx | 4395 | tcp | OmniVision communication for Virtual environments | Vacquier Serge | Vacquier Serge | 2009-02-12 | |||||
| omnivisionesx | 4395 | udp | OmniVision communication for Virtual environments | Vacquier Serge | Vacquier Serge | 2009-02-12 | |||||
| fly | 4396 | tcp | Fly Object Space | Nigel Warren | Nigel Warren | 2009-02-12 | |||||
| 4396 | udp | Reserved | |||||||||
| 4397-4399 | Unassigned | ||||||||||
| netcabinet-com | 4409 | tcp | Net-Cabinet comunication | Ian Manning | Ian Manning | 2009-12-16 | |||||
| 4409 | udp | Reserved | |||||||||
| cbp | 4419 | tcp | Colnod Binary Protocol | Colsys s.r.o. | Jiri Merth | 2016-03-23 | |||||
| 4419 | udp | Reserved | |||||||||
| omviagent | 4429 | tcp | OMV Investigation Agent-Server | Serge Vacquier | Serge Vacquier | 2009-05-20 | |||||
| 4429 | udp | Reserved | |||||||||
| privatewire | 4449 | tcp | PrivateWire | Uri Resnitzky | Uri Resnitzky | ||||||
| privatewire | 4449 | udp | PrivateWire | Uri Resnitzky | Uri Resnitzky | ||||||
| 4459 | Unassigned | ||||||||||
| ntske | 4460 | tcp | Network Time Security Key Establishment | IESG | IETF Chair | 2020-04-07 | RFC 8915 | ||||
| 4461-4479 | Unassigned | ||||||||||
| 4489-4499 | Unassigned | Known UNAUTHORIZED USE: Ports 4490 and 4491 | |||||||||
| ipsec-nat-t | 4500 | tcp | IPsec NAT-Traversal | 2022-09-15 | RFC 9329 | ||||||
| ipsec-nat-t | 4500 | udp | IPsec NAT-Traversal | 2017-07-07 | RFC 3948; RFC 7296 | ||||||
| 4539-4544 | Unassigned | ||||||||||
| aegate | 4549 | tcp | Aegate PMR Service | Nick Warrington | Nick Warrington | 2006-03 | |||||
| aegate | 4549 | udp | Aegate PMR Service | Nick Warrington | Nick Warrington | 2006-03 | |||||
| dtn-bundle | 4556 | tcp | DTN Bundle TCP CL Protocol | IESG | IETF Chair | 2021-02-22 | RFC 9174 | ||||
| dtn-bundle | 4556 | dccp | DTN Bundle DCCP CL Protocol | 2013-11-12 | 2014-02-21 | RFC 7122 | 1685351985 | ||||
| hylafax | 4559 | tcp | HylaFAX | Lee Howard | Lee Howard | 2002-03 | |||||
| hylafax | 4559 | udp | HylaFAX | Lee Howard | Lee Howard | 2002-03 | |||||
| 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. |
||||
| 4574-4589 | Unassigned | ||||||||||
| rid | 4590 | tcp | RID over HTTP/TLS | IESG | IETF Chair | RFC 6546 | |||||
| 4590 | udp | Reserved | |||||||||
| l3t-at-an | 4591 | tcp | HRPD L3T (AT-AN) | Avi Lior | Avi Lior | 2009-02-27 | |||||
| l3t-at-an | 4591 | udp | HRPD L3T (AT-AN) | Avi Lior | Avi Lior | 2009-02-27 | |||||
| 4592 | tcp | Reserved | |||||||||
| hrpd-ith-at-an | 4592 | udp | HRPD-ITH (AT-AN) | David Ott | David Ott | 2008-06-05 | |||||
| ipt-anri-anri | 4593 | tcp | IPT (ANRI-ANRI) | ||||||||
| ipt-anri-anri | 4593 | udp | IPT (ANRI-ANRI) | ||||||||
| ias-session | 4594 | tcp | IAS-Session (ANRI-ANRI) | ||||||||
| ias-session | 4594 | udp | IAS-Session (ANRI-ANRI) | ||||||||
| ias-paging | 4595 | tcp | IAS-Paging (ANRI-ANRI) | ||||||||
| ias-paging | 4595 | udp | IAS-Paging (ANRI-ANRI) | ||||||||
| ias-neighbor | 4596 | tcp | IAS-Neighbor (ANRI-ANRI) | David Ott | David Ott | 2007-07-31 | |||||
| ias-neighbor | 4596 | udp | IAS-Neighbor (ANRI-ANRI) | David Ott | David Ott | 2007-07-31 | |||||
| a21-an-1xbs | 4597 | tcp | A21 (AN-1xBS) | David Ott | David Ott | 2006-02 | |||||
| a21-an-1xbs | 4597 | udp | A21 (AN-1xBS) | David Ott | David Ott | 2006-02 | |||||
| a16-an-an | 4598 | tcp | A16 (AN-AN) | David Ott | David Ott | 2005-12 | |||||
| a16-an-an | 4598 | udp | A16 (AN-AN) | David Ott | David Ott | 2005-12 | |||||
| a17-an-an | 4599 | tcp | A17 (AN-AN) | David Ott | David Ott | 2006-02 | |||||
| a17-an-an | 4599 | udp | A17 (AN-AN) | David Ott | David Ott | 2006-02 | |||||
| dots-signal | 4646 | tcp | Distributed Denial-of-Service Open Threat Signaling (DOTS) Signal Channel Protocol. The service name is used to construct the SRV service names "_dots-signal._udp" and "_dots-signal._tcp" for discovering DOTS servers used to establish DOTS signal channel. | IESG | IETF Chair | 2020-01-16 | 2021-06-14 | RFC 8973; RFC 9132 |
Contact Information
| Name | Organization | Contact URI | Last Updated |
|---|---|---|---|
| Amazon.com Services LLC | aws-iana&amazon.com | 2022-11-07 | |
| Angelo Masci | angelomasci&yahoo.co.uk | 2007-01 | |
| Avi Lior | avi&bridgewatersystems.com | 2009-02-27 | |
| Benjamin Kowarsch | benjamin&sunrise-tel.com | 2004-11 | |
| Colsys s.r.o. | jiri.merth&colsys.cz | 2016-03-23 | |
| Darin Smith | darin.smith&harman.com | 2017-02-16 | |
| David Ott | dott&qualcomm.com | 2010-10-15 | |
| DMTF Administration | admin&dmtf.org | 2025-05-30 | |
| Erlang/OTP support | epmd&erix.ericsson.se | 2004-12 | |
| Frank Hartung | Frank.Hartung&ericsson.com | 2007-09-07 | |
| Glenn Anderson | glenn&qualcomm.co.nz | ||
| Harman International Industries Inc. | darin.smith&harman.com | 2017-02-16 | |
| IESG | iesg&ietf.org | ||
| IETF | iesg&ietf.org | ||
| IETF Chair | IETF | chair&ietf.org | |
| Ian Manning | ian&baycastle.co.uk | 2009-12-16 | |
| Jiri Merth | jiri.merth&colsys.cz | 2016-03-23 | |
| Lauren Townsend | Amazon.com Services LLC | townslau&amazon.com | 2020-04-06 |
| Lech Lakomy | llakomy&apwi.com | 2009-02-12 | |
| Lee Howard | iana&hylafax.org | 2002-03 | |
| Mark Revier | Sentyron B.V. | iana&sentyron.com | 2025-10-30 |
| Michael Werski | michael.werski&azeti.net | 2010-02-18 | |
| Mike King | mike.king&pvxplus.com | 2009-11-09 | |
| Mitra | mitra&earth.path.net | ||
| Nick Warrington | nick.warrington&paconsulting.com | 2006-03 | |
| Nigel Warren | info&flyobjectspace.com | 2009-02-12 | |
| Robert Keyes | robert&woldconsulting.com | 2025-05-30 | |
| Ron Minnich | rminnich&sarnoff.com | ||
| Ronnie Sahlberg | ronniesahlberg&gmail.com | 2007-07-05 | |
| Scott Guthery | sguthery&hidcorp.com | 2008-08-25 | |
| Sentyron B.V. | iana&sentyron.com | 2025-10-30 | |
| Serge Vacquier | svacquier&axway.com | 2019-03-29 | |
| Stephen M. Webb | stephenw&xandros.com | 2007-05 | |
| Tom Maaswinkel | tom.maaswinkel&publiqare.nl | 2011-02-07 | |
| Uri Resnitzky | info&arx.com | ||
| Uwe Holz | uwe.holz&azeti.net | 2009-11-09 | |
| Vacquier Serge | vacquier&systar.fr | 2009-02-12 |