There used to be a hack for internet explorer that would mask the url and replace it with something else, you could've used that in combination with a http request redirect so people visiting your site would have unknown2.com in their URL bar.
However, this has long ago been patched and won't work anymore. Good thing too, best way ever to spoof a website to get other peoples logins (just imagine what'd happen if you made a copy of the hotmail.com website for example, host it somewhere and made it look like those sites, then trick people into going to your URL and filling in their usernames and passwords.. Or worse, if you did stuff like that on a banking site and stole peoples money..).
So no, you cannot. Not without actually buying the domain - which only costs somewhere around $15 anyway, so I don't see what the fuzz is all about to be honoust.
