What is a port number in computer networking?

A port number is a 16-bit integer (0 to 65535) used by TCP and UDP transport protocols to route network traffic to specific applications or services running on an operating system.

What is the difference between Well-Known, Registered, and Dynamic ports?

Ports 0–1023 are Well-Known system ports (HTTP, SSH, DNS) requiring root/admin privileges to bind. Ports 1024–49151 are Registered ports assigned for specific applications (MySQL, Redis). Ports 49152–65535 are Dynamic/Ephemeral ports used for temporary outbound client connections.

Does this tool scan my computer or network for open ports?

No. This tool is strictly an offline-capable reference database and port calculator. It does not scan, probe, or connect to any local or remote network ports.

Port Number Lookup | TCP & UDP Network Port Directory & Firewall Rules