Is there a place on the internet where one can look up player numbers of professional or college althletes?

Is there a place on the internet where one can look up the player numbers of professional or college althletes? If someone wanted to learn who wore the number 10, for instance - can that be looked up?Is there a place on the internet where one can look up player numbers of professional or college althletes?
Im not sure if there is an official website, but if you go to different sports teams and look at their history, it should tell you their numbers. redsox.com is a good place.

one web hosting