A port is a virtual point where network connections start and end.
Ports are software-based and managed by a computer's operating system.
A port is associated with a specific process or service (Internet Browsing, Email, VoIP etc.)
Ports allow a single host with a single IP address to run network services.
Each port number identifies a distinct service.
Each host can have 65535 ports per IP address.
Ports are regulated by the Internet Corporation for Assigning Names and Numbers (ICANN).
By ICANN there are three categories for ports:
- From 0 to 1023 – well known ports assigned to common protocols and services
- From 1024 to 49151 – registered ports assigned by ICANN to a specific service
- From 49152 to 65 535 – dynamic (private, high) ports range from 49,152 to 65,535.
Ports can be used by any service on an ad hoc basis.
Ports are assigned when a session is established, and released when the session ends.
Well-Known Ports Are:
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