UPC EXT2 Barcode (Extension 2 Barcode)

UPC-A, UPC-E, EAN-13, and EAN-8 may all include an additional barcode to the right of it. The additional barcode can be UPC EXT2 barcode (Extension 2). 2-digit supplemental barcodes should only be used with magazines, newspapers and other such periodicals.

The 2-digit supplement represent the issue number of the magazine. This is useful so that the product code itself (contained in the main barcode) is constant for the magazine such that each issue of the magazine doesn't have to have its own unique barcode. Nevertheless, the 2-digit supplement can be used to track which issue of the magazine is being sold, perhaps for sales analysis or restocking purposes.

UPC EXT2 Barcode Encoding

• Left guard bars, encoded as 1011.
• First data character, encoded using appropriate parity pattern
• Character seperator of 01.
• Additional characters, encoding using the appropriate parity pattern, with separators of 01.