text: if i have an ip address, is there a way to figure out whose computer it is?? thanks. from a hacker.... the only thing you can do with the ip address on the internet is get a whois lookup. this will get you the owner of the ip address which is the isp and not the user per se.  unless you have a search warrant for the isp you can not find out the details of the user of that ip address. the website posted above has a whois lookup in it. i perfer other sites like arin http://www.arin.net/whois but that one will do too. you can try other techniques that would allow you to get the information on him.   like social engineering. this is a technique that hackers use alot to get information. there are tons of social engineering papers on the internet check them out.   i have other informationn i would like to post here but it would be useless to you if you don't understand alot about the it security world. good luck.  edit* i post above cause i assumed it was through the internet. however if it was in a lan then it is totally two different scenarios.