I’ve been doing some network troubleshooting, and with my limited/forgetful memory of what ports are used for what, Kurt Seifried’s port lookup page is a lifesaver. It has a total of 8,457
ports listed, and has some nice explanations on what the ports should or should not be doing. Thanks Kurt!
I’ve also added a port scanner since, available at http://www.seifried.org/freescan/freescan.php