The
Intelligent Mail Barcode (
IM barcode) is a 65-bar code for use on
mail in the
United States. The term “Intelligent Mail” refers to services offered by the
United States Postal Service for domestic mail delivery. The IM barcode is intended to provide greater information and functionality than its predecessors
POSTNET and
PLANET. An Intelligent Mail barcode has also been referred to as a
One Code Solution and a
4-State Customer Barcode, abbreviated 4CB, 4-CB or USPS4CB. The complete specification can be found in USPS Document USPS-B-3200. It effectively incorporates the routing
ZIP code and tracking information included in previously used postal barcode standards.