So I posted a week or so ago about someone harassing me on tumblr and I got some awesome help and managed to snag an IP address from the culprit.

Now I have been digging, and it seems besides narrowing down the city I can't get much more specific then that with the info I have. However I know they are in my hometown, and I have some ideas who it could be. So I was wondering, how do I find the IP addresses of the people I suspect and compare that IP to the one being used by the culprit?

Or is there a TOTALLY easier way to do this?

Appreciate the help a lot guys!!