Destination Port Number

This is  port number used by the process  running on the destination host. It is also 16 bits long  if the destination  host if  server ( a client  sending  a request). The port number  inmost  is a well  known port number. If  the destination host is the  client the port  number in most cases, is  ephemeral port number. In this  case the server copies  the ephemeral  port number it has received in the  request packet .