NPA NXX North American Telephone Database. Area Code.U.S. switching centers.NPA.NXX.Exchange
NPA NXX North American Telephone Database. Area Code.U.S. switching centers.NPA.NXX.Exchange >> 18 rows numbering plan area code. the first three digits of a 10 digit north american numbering plan. Population of all fields is required. NPA NXX North American Telephone Database. Area Code.U.S. switching centers.NPA.NXX.Exchange stuffsoftware.com The npa. combined with the central office code or nxx. is the destination code being reported. Up to $150 cash back instruction for filling out the area code/prefix list: Npa nxx area code and exchange databases.