GS1 allocates the prefix which enables your trading partners throughout the world to identify you and your country of GS1 subscribership. In India this number begins with 890.

The next four or five digits ( depending on the prefix allocated)are allocated by the subscriber for each product and its variant.

The last digit is the check digit calculated from the preceding digits. The decoding software calculates what the check digit should be while decoding the symbol and compares it to the scanned check digit. Any difference indicates an error.

To know more about implementation of  the GS1 system in Retail, Trade and Logistic units, please refer to implementation guide provided to you or Click Here.