Unregistered? Ah, I know this is probably not the kind of question you usually get, but you wouldn't happen to familiar with the constellation of Kasterborous, would you?

[He's not really expecting her to be, but it's worth a try, and the general location should be more familiar than the name of a planet. And honestly, it's general locations or the coordinates to Gallifrey herself and there's no real guarantee that the latter would be any more useful.]

And I'm afraid the city itself isn't very big on tech. Not without it being something that someone else has brought in.