What is the highest port number one can use?
The port number is an unsigned 16-bit integer, so 65535.
The port identifiers are unsigned 16-bit integers, meaning that the largest number you can put in there is 216-1 = 65535.
Each port has a port number for identification. Port numbers 0 - 1023 are used for well-known ports. Port numbers 1024 - 65535 are available for the following user applications: Port numbers 1024 - 49151 are reserved for user server applications.
The port number is an unsigned 16-bit integer, so 65535.
The largest port number is an unsigned short 2^16-1: 65535
A registered port is one assigned by the Internet Corporation for Assigned Names and Numbers (ICANN) to a certain use. Each registered port is in the range 1024–49151.
Since 21 March 2001 the registry agency is ICANN; before that time it was IANA.
Ports with numbers lower than those of the registered ports are called well known ports; port with numbers greater than those of the registered ports are called dynamic and/or private ports.
Wikipedia : Registered Ports
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