If you use a site like www.dnsstuff.com you can do a reverse dns on the domain name. Not all domains have an rdns but most that are owned by reputable firms do have the rdns listed. This will give you a domainn name something like asd-werrd.aardvark.cable.example.com. If you then do a whois for the example.com part, or visit that web site, then you will get the name and address of the owner.
if you need the information for a non-frivilise lawsuit purpose the ISP will usually give you some of their info. I gave sombodies ISP an IP because they hacked my server and they gave me their info so i could sue then and then they shutdown that persons internet. I had to prove my case of course, thats why im sure glad i have a trafffic log for every port there is.
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