Usually you need to be some sort of carrier or service provider and have SS7 connectivity or a connection to the N-PAC. Go to TELCORDIA's site they have all the Bellcore documents about the LIDB database which is part of the numbering administration for NXX codes, rating & routing, etc.....
Also NANPA's site has some info.
Many carriers contract with a LEC or large IXC (such as MCI) for such services. Another 3rd party provider is Illuminet. I think that there is also a division of Verisign who will do it, too.
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