Common Ports & Protocols

A quick cheat sheet I use a lot:

• FTP: 21/TCP
• SSH: port 22/TCP
• HTTP: port 80/TCP
• HTTPS: port 443/TCP
• Postgres: 5432/TCP

Notes:

• Most of these are conventions, not hard requirements. Services can run on non-standard ports.
• Port numbers only tell you where to connect. The protocol still matters (TCP vs UDP, handshake behavior, encryption, etc.).