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What are TCP and UDP ports?

They allow specific communications between computers, applications and programs.

A port is how a program, computer, application communicates with each other using TCP or UDP.

The ports are broken down into three categories:

  1. Well Known Ports: Range from 0 through 1023 and are assigned by the IANA (Internet Assigned Number Authority). These are the most commonly used ports.
  2. Registered Ports: Range from 1024 through 49151 and are listed by the IANA. These ports can be used through normal user processes or executable programs on most computers.
  3. Dynamic and/or Private Ports: Range from 49152 through 65535.

For a complete list of all the TCP/UDP ports please visit Iana Port numbers or Network Ice Port Knowledgebase.

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