Dictionary · Protocols and Ports
Well-Known Ports
Ports · Beginner
Port numbers from 0 through 1023, reserved for standard services such as encrypted web traffic and remote shell access. On many systems, binding one requires privilege.
These are the familiar service numbers. They are a convention that helps you recognize traffic, not a guarantee that the program on that port is what you expect.
Example: Ports 22, 53, 80, and 443 sit in this range and are associated with common services.
Common misconception
- A number in this range does not prove which application is running. Administrators can run a service on an unusual port.