I had a +++++ of a time dealing with AOL users as every time they log in they got a new IP address... I don't know if this will help but I spent about a month working on the following codes that finally stopped my troll!
IP NoRegister:
https://vborg.vbsupport.ru/showthread.php?t=129280
IP NoView:
https://vborg.vbsupport.ru/showthread.php?t=127288
IP NoPost:
https://vborg.vbsupport.ru/showthread.php?t=129277
The first two are the most useful for my site... Good luck and I hope this helps a little...