Nadar

It's nothing new that "so called hackers" (i prefer cheaters or just low-life's) try to find names that's difficult to identify. I've seen several that uses the confusion between capital i (I) and lowercase L (l) for example. I doubt the name itself is a "hack" though, and the failure to identify the player is probably due to bugs in the admin system. That said, it could ofcourse exploit at bug in the admin protcol itself, but it's hard to judge without more data.