Usually, it’s something like 192.168.0.1 (you type this into your browser address bar). This will then probably bring up a username and password login screen. The details should be somewhere in your documentation, or even on the hub itself. Once you’ve done this, you will get a screen with all sorts of info. There should be something with ‘attached devices’. Can’t remember exactly where, in the HH management page.
Should show you if someone else has hacked in. If they have, then they can’t be too far away. Next door, maybe?
It isn’t that easy for an average computer user to crack your WEP password. But it is possible, so you should be careful.