Appendix D: UDP and TCP Port Numbers


The following list of port numbers comprises information derived mainly from RFC 1700. Any errors or omissions are, therefore, my own. The port numbers are divided into three ranges, as follows:

  • Well-known ports are those from 0 through 1,023.

  • Registered ports are those from 1,024 through 49,151.

  • Dynamic and/or private ports are those from 49,152 through 65,535.

The list provided here is not exhaustive. For a complete up-to-date list of port assignments see the IANA URL: URL =

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