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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. |
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As I understand it, you should only use up to 49151, as from 49152 up to 65535 are reserved for Ephemeral ports |