Generally speaking it really depends. My Linksys Router defaults to 192.168.1.1 for the administration page, I don't know about others but I imagine it'll be close maybe 192.168.1.254 or something like 10.0.0.1. If you got the manual check in there for the defaults. If you don't have the manual you should be able to find a copy of the manual or at least some tips from the manufacturers website on what the dafaults are. Most of the Routers for the home consumer come with a way to reset the thing to defaults including the password it takes to get into the administration page. Hope to get the info when you get home.
Yes, I made it past newbie w00t.