About knownports

knownports.online is an independent reference to the IANA Service Name and Transport Protocol Port Number Registry. It is edited by Liam Cooper. The site is not affiliated with IANA, ICANN, the IETF or the RFC Editor.

What the site does

The registry is one long file. This site turns it into pages a person can read: one page per range of numbers, pages for the numbers whose entries stand apart, a lookup that searches every row, and a handbook of articles built on counts from the file. It reports registry entries only and does not test, scan or rate any port.

Sources

Port data: IANA registry, as updated October 26, 2026, dedicated to the public domain under CC0 1.0. RFC titles, dates and status: RFC Editor rfc-index.xml. The method behind every statement is on the sources page.

Contact

Corrections and questions: contact page.