TCP And UDP Port Number Assignments
Port numbers in the TCP/IP environment are discussed and listed in RFC 1700. The RFC is a 400Kb+ file and will be displayed as a text document in your browser. Use your browser BACK button to return to this page when you are done with the document. You should be able to begin reading the downloaded document in about 10 seconds although the entire document will require about 40 seconds to download.
The Technical Compendium includes a broad discussion of the various protocols in the TCP/IP environment.