Port numbers

A port is an endpoint for communication between applications, generally referring to a logical connection. A port provides queues for sending and receiving data. 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.
    • Port numbers 49152 - 65535 are reserved for clients.

    If you have a server in the client port range (49152 - 65535), define that server in the TCP/IP network services database to prevent port number conflicts.