What is a Port Number?
A port number is an identification of communication to a resource in the server. The server (TCP/IP) determines what information is requested from this number and then calls the respective program to attend to that specific request.
Reserved or Well known port
Port numbers between 0 – 1023 port number (IANA registered)
Registered ports
Port numbers between 1024 – 49151 (IANA registered)
Dynamic ports
Port numbers between 49152 – 65535
For more information on port numbers refer
http://www.iana.org/assignments/port-numbers
