There are already numerous questions on this site asking the same or similar questions. The general consensus of opinion seems to be that unless you are the police then subsribing to a service at 192.com is the best way to do it but there are no free websites that do it.

the closest i have herd of is one where you van search by STD code only http://www.brainstorm.co.uk/utils/std-codes.html. Not exactly what you r looking for, but close!