Freight ForwardingLVT Toolbox · Container check digit
Container check digit
Check whether container numbers are valid under ISO 6346 – one or many at a time.
ISO 6346
Format: 3-letter owner code + category (U, J or Z) + 6 digits + check digit. Spaces and dashes are ignored.
Result
How the check digit is calculated
Each letter gets a value (A=10, B=12 … Z=38 – the numbers 11, 22 and 33 are skipped), digits keep their value. Values 1–10 are multiplied by 1, 2, 4, 8 … 512, the sum is divided by 11 and the remainder (10 becomes 0) is the check digit.
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