The leading Number System Character, (the first number of the 11 digits to be entered) should conform to these UPC assignments:
0,6,7 Regular UPC 12 digit codes with numbers assigned by the UPC Council. (Do not use 0 as the leading number for
2
3Reserved for National Drug Code and Health Related Items.
4Use this leading digit for
5Reserved for coupons. Do not use this today, or you will not be able to process coupons through your system tomorrow.
UPC 2 and 5-character supplemental codes
The UPC standards include the addition of a 2 or
NOTE: Enabling the supplements disallows the reading of UPC codes from right to left to assure that the supplement does not get missed.
ISBN Specifications
ISBN (International Standard Book Numbering) bar codes are essentially
ISBN