Intelligent Mail Barcode | IMb Decoded | USPS IMb Explained
Apr 11, 2017· The barcode contains a great deal of information and all 65 bars are required. There are up to 31 digits encoded into 65 vertical bars. It does so with a 4–state symbology – and no, 4-state doesn't refer to four of the 50 states, the four states refer to the size and placement of the bar, called full bar, ascender, tracker, or descender ...