posted on Jun, 18 2010 @ 04:52 PM
You can't (or at least shouldn't be able to!) use that IP to personally identify someone, the best you can do on your own as a private citizen would
be to work out who that persons internet service provider is and the general location down to the closest city usually.
And that is only if that person didn't take any sort of precautions to anonymize their internet use (a very simple to do to some degree).
The police would be able to investigate further (if they are interested) and they could probably get more specific information from the ISP.
Another thing you could do is google 'IP lookup' and pop the ip in one of those, just to see what information comes up.