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TCP/UDP Ports Reference — 50 common ports explained

Quick reference for TCP/UDP ports you are most likely to encounter. What the service does, security risks, and a one-click "scan this port" link.

Web (HTTP/HTTPS)

Email (SMTP/IMAP/POP3)

Databases

Security / Remote Access

Networking

Enterprise

Media / VoIP

Developer Tools

Gaming

Legacy (do not expose)