Technology/Networking/Common Ports & Protocols.md Common Ports & Protocols Markdown 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.).