Postnet - Barcode Type¶
Used by the United States Postal Service until 2009, the PostNet barcode was used for encoding zip codes on mail items. PostNet uses numerical input data and includes a modulo-10 check digit. While Zint will encode PostNet symbols of any length, standard lengths as used by USPS were:
- PostNet6: 5 digits ZIP input
- PostNet10: 5 digit ZIP + 4 digit user data
- PostNet12: 5 digit ZIP + 6 digit user data
