Code 39

Code 39 (ISO/IEC 16388)

1D barcode43-character alphabet

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What is Code 39?

A widely deployed alphanumeric linear barcode. Every character contains nine elements, three of which are wide, and the asterisk pattern serves as both start and stop.

How it is structured

Asterisk start, characters separated by a narrow inter-character gap, optional modulo-43 check character, and asterisk stop. Native data covers A–Z, 0–9, and seven symbols.

Where it is used

Manufacturing, automotive, defence logistics, asset labels, and legacy industrial inventory.

Primary specification

See ISO/IEC 16388 for the authoritative specification or publisher record.