http://whatismyipaddress.com/

IP Address stands for Internet Protocol Address – this is a uniqui number given to every device connected to the Internet. An IP address can identify where in the country you are from, or more to the point, where the computer that is connected to the Internet is located. An IP number looks something like 127.0.0.1.

Sometimes these numericals cam be difficult to handle, an IP address may also be assigned to a Host name, which is often much easier to remember. Hostnames may be looked up to find IP addresses, and vice-versa.