Common TCP/IP Applications and Well-Known and Registered Port Numbers
The great popularity of the TCP/IP protocol suite has led to the development of literally thousands of different applications and protocols. Most of these use the client/server model of operation that I discussed earlier in this chapter. Server processes for a particular application are designed to use a particular reserved port number, and clients use an ephemeral (temporary) port number to initiate a connection to the server. To ensure that everyone agrees on which port numbers each server application should use for each application, port numbers are centrally managed by the IANA.
Originally, IANA kept the list of well-known and registered port numbers in a lengthy text document ...
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