The national statistics directorate in Belgium defines a set of five-digit NIS codes that identify the towns and localities in each province in Belgium. The national statistics directorate also defines a set of four-character codes that identify the neighborhoods in each town or locality. The Address Validator returns the codes on the NIS Code port as a nine-character string. The first five digits of the port data identify the town or locality to which the valid address belongs. The final four characters identify the neighborhood within the town or locality.