Ummm.... Whenever you log in, at the top of the screen, it says what IP you last logged in from, I'd say that means that they know :P We can see it. But I don't think they can see it. Also, don't think they save our Ip-adresses in their computer. Cause that would be privacy concerns or something? Dunno, but from what I heared, they can't do so... Ever heard of cookies. They can see you ip adress and know what you do. And yes runescape does have cookies. I have two form them and i deleted my cookies a few hours ago. They most likley don't save the ip adress to a spefic place but they do check to see if you mulpute logged in. But jagax is a compnay first and formost so you shouldn't worry about their cookies. IT is only the cookies form less reputable sites you should worry about.