Resources and Education for the GS1-128 symbology

SSCC-18 Barcodes


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.