Is it possible to look up someone's if I have their driver's license number?
Well here you can look up someone if you know their license plate number. Which country are talking about? So who is she?
If it is about a legal/civil matter one could contact the local police, but they may not be allowed to provide that information.
I'm in Canada. This is not about a girl.
One of my wife's maternity leave checks went missing quite a while ago, we thought we had it sorted out, and got the payment reissued. Apparently someone cashed the check, and now I have a copy of the check, upon which the person who cashed it wrote (maybe) their driver's license number.
Go to the police with the matter.
Around here, all the State cops have computers in their cruisers, and they can ID you in no time with a driver's license #.
Went to the police today, we'll see what happens.
Separate names with a comma.