I have an old friends phone number, but its unlisted, how can I do a reverse phone look up?

Its my old friend's dad's number if I'm remembering right, I don't even know her full first name, all I really need to know is her last name and I could find her. So how can i do a reverse look up like that? (Its a land-line) And theres no way I'm gonna call her dad lol :/