repost: SSCC-18 Barcodes - GS1-128 INFOGS1-128 INFO
# Application Identifier (AI)
The AI “00” indicates the SSCC-18 data structure will follow.
# Extension Digit
The Extension Digit has no defined logic and is used to increase the capacity of the Serial Reference
# GS1 Company Prefix
GS1 Company Prefixes are 7-10 digits. Serial Reference Numbers are 6-9 digits.
# Serial Reference
The Serial Reference number is assigned by the holder of the GS1 Company Prefix to uniquely identify a shipping container (logistic unit). A Serial Reference cannot be reused for a minimum of 12 months. The combined length of the GS1 Company Prefix and Serial Reference is always 16 digits.
# Check Digit
Calculated using the Modulo 10 algorithm. Use a free Check Digit Calculator offered by Bar Code Graphics.
