Tracert is a command which can show you the path a packet of information from your computer to a specified destination. It will list all of the routers it passes through until it reaches it's destination, or fails to and is discarded.

To perform a tracert select start > Run and then type in CMD clicking ok at the bottom. If you are using Vista select start > All Programs > Accessories > Command Prompt.

Enter the word tracert, followed by a space and then the domain name.