Did you buy your modem thru your isp or independently? If thru your isp their customer support will know how to log into your modem. When you tried to log into your modem with any of those no.'s did you get any type of message at all? You should have got a login window unless you have it set for auto login. Surely you have a manual that came with your modem. I'd be extremely surprised if you didn't. your manual will explain how to log in & which address to use.