I tried the classic 192.168.0.1, which is also written on the modem itself, and I get nothing.
Let me know has I want to optimize it.
The login info including IP and password, should be on the small, white sticker on the modem itself.
If your modem is not bridged and you still can't login, do what kevein suggested above. Press the pin-hole reset button on the back until you see the front lights go off. It will reset to factory defaults. Try logging in again and let us know if that works or not.
Is your modem in bridge mode - are you using your own router? If you are, you can't login
If you are using it as your modem/router unit, try resetting it, push and hold the reset button (the one recessed, not sticking out) for 15-30 seconds until the lights go out on the front
See if you can access the page then
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