The best ones show a port scan. The worst just show scrolling html source code.

Ncis episode Tim traced ThE mOsT dAnGeRoUs HaCkEr iN tHe WoRlD to an internal 192.168.something. I do not remember how it was resolved because I was laughing too hard.
(the whole two person keyboard thi g early in the series was an intentional gag, so it doesn’t count)