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stolen from http://www.isi.edu/in-notes/iana/assignments/port-numbers, reformatted, corrected typos, and marked up slightly, then split into pieces, because it's not cool to make a 380KB node:

  • Well Known Ports (ports 0-1023, "on most systems can only be used by system (or root) processes or by programs executed by privileged users")
  • Registered Ports (ports 1024-49151, "on most systems can be used by ordinary user processes or programs executed by ordinary users.")
  • Dynamic and/or Private Ports (ports 49152-65535)