Port number lookup

Search 53 well-known TCP/UDP ports by number, service, or protocol — with a one-line note each.

Everything runs in this browser. The list is a built-in reference of ~150 common ports, not the full IANA registry.

How to use

  1. Type a port number, service, or protocol.
  2. Read the matching entries.

What it supports

A built-in reference of common assignments, not the full IANA registry — absence does not mean unassigned. Both tcp and udp rows are listed where a service uses both.

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