Common IP address for routers. The administrative functions of most routers can be manipulated by entering the IP address into a browser. The username is usually left blank, and the password is usually "admin."
h4x0r 1: "Man, RoadRunner changed it so I can't have a network on my cable modem!"
h4x0r 2: "Chillax. Go to 192.168.0.1 and clone the cable modem's MAC address to the router."
(Note: The above conversation was translated from l33t for the purpose of distribution.)