Common Port Numbers
If you have ever been frustrated because you cannot remember what port TACACS(49) runs on or you are just curious about which protocols run on which ports. Then the following link is for you. The author of this pdf did a pretty good job listing out most of the common ports and the protocols that run on those ports. He even went so far as to color code specific ports to signify which ones were used for gaming, chat, encryption, malicious content and a few others.