How to Track a Stolen Laptop With an IP Address
1. Contact your ISP (Internet service provider) to see if the thief has accessed the Internet using your service. The ISP issues a location-specific IP address when a computer accesses the Internet. If the owner of a stolen laptop obtains an IP address assigned to her computer since the theft, then the police can track its location.
2. Investigate whether programs such as Yahoo! Messenger or email software that automatically logs on at boot-up are still being accessed. Contact the service provider with appropriate police report documentation and a subpoena to obtain a recent IP address for a stolen laptop.
3. Use preinstalled antitheft clients to obtain a recent IP address for the stolen laptop. Supply the IP information to law enforcement. http://www.tomshardware.com/forum/243694-44-track-stolen-laptop