Look up a port number

What listens on 5432? What port does Redis use? A searchable table of the well-known TCP/UDP assignments.

Tools used in this guide

Port number lookup

The job

Debugging a connection, writing a firewall rule, reading a config — you constantly hit bare port numbers. A local lookup answers without a search-engine trip.

Search

Type a number, service name, or protocol. Matches come from a built-in list of 53 common assignments — port, tcp/udp, service, and a one-line note.

Numbers match exactly — 5432 finds PostgreSQL.
Names match partially — "sql" finds MySQL, PostgreSQL, and MSSQL.

Worked example

A mystery process listens on 6379 — the table says Redis. A new app needs a dev port; checking 3000 and 8080 shows both are common conventions, not assigned standards.

Where it stops

53 well-known ports, not the 65,535-deep IANA registry — absence proves nothing. Dynamic/private port usage (49152+) is out of scope entirely.