National Customer Support Center. Intelligent Mail Barcode Resource Download Site The Intelligent Mail barcode (formerly known as the 4-State Customer Barcode) is the next generation of USPS® barcode technology used to sort and track letters and flats. Intelligent Mail barcode technology, among other things, combines the capabilities of the POSTNET™ barcode and the PLANET Code® barcode into one unique barcode. Intelligent Mail Barcode Specification (PDF) Learn about the data content to be encoded, encoding rules to produce bars from data fields, physical dimensions of printed barcodes, and physical limitations on printing. The specification document (USPS-B-3200) also covers how the encoding and decoding algorithms work and provides sample programming code. List of Intelligent Mail Barcode Resources (PDF)Get information about the tools and applications available to you from the Postal Service™ as well as from vendors for creating and validating the Intelligent Mail barcode.
Zipdecode. ISO 3166 Codes (Countries) Countries of the World. Publication 28 - Postal Addressing Standards. World Telephone Numbering Guide.