192.168.0.1 is a private IP address, similar to 192.168.1.1 or 10.0.0.1 used by many vendors as the default gateway which is used for logging the admin panel and to configure the basic and advanced settings. Once you enter the login credentials,192.168.0.1 you will be logged in into the configuration page and will be able to make the desired changes for the router or modem.