Internal IP address
Alternatively referred to as the local IP address, the internal IP address is the address that is assigned by your local network router that often begins with 192.168.x.x. These IP addresses can only be seen by other computers in your local network and not by any computers connected in an external network such as on the Internet.
To reach the Internet or a computer in another network your computer is often assigned an external IP address, which can then be used to refer back to the computer in your local network.
Also see: External IP address, IP address, Network definitions