text: 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.\n\nUnless 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. \n\nLike 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. \n\nI 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.\n\nedit* 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.