Here below an interesting internet site where collect information about an IP address (the address assigned to a computer once connected to internet).

http://www.ripe.net/whois

IP address can be dynamic (assigned by the server after connection and changing time to time) or static (every time the same for that computer).
In this second case you can approximately locate also remote computer position:

http://www.seomoz.org/ip2loc?start

Your IP address