Well-Known Ports Reference

Searchable list of well-known TCP/UDP ports — filter by port number, service name, or description

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What is Well-Known Ports Reference

Last reviewed: April 18, 2026

Well-Known Ports Reference is a searchable index of commonly-used TCP and UDP ports — from SSH (22) to Kubernetes API (6443) to Memcached (11211).

Type a port number, service name, or keyword and get an instant filtered list. Handy when triaging firewall rules, docker-compose files, or network diagrams.

Why use it

Look up what a port does in seconds.
Audit docker-compose port mappings.
Teach networking basics with real examples.
Spot unusual ports in server logs.
Plan firewall / ACL rules quickly.

Features

60+ curated ports
Search by number or name
One-line table output
Covers DB, web, mail, ops
All Well-Known Ports Reference work stays on your device

How to use Well-Known Ports Reference

Type query. Port number or service keyword.
Run. Get filtered matches.
Copy. Paste into firewall rules or docs.

Example (before/after)

Query

redis

Matches

 6379  Redis                 Redis

Common errors

Dynamic ports

Most apps use 49152+ dynamically.

Fix: This list covers well-known and registered popular ports; dynamic ranges aren't itemised.

Alternate ports

Many services can be reconfigured to any port.

Fix: Use this list as a starting point, not the ground truth for a given server.

FAQ

Can I search by number?

Yes — type a port number to filter.

Can I search by service?

Yes — type a service name (e.g. 'redis', 'kafka').

How many ports are listed?

60+ of the most commonly-used ports.

Is input uploaded?

No — filtering is client-side.

Is this an official IANA list?

No — it's a curated subset focused on common developer scenarios.

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