BIC ISO 6346 Container Number Check Digit Calculator
Calculates and verifies the check digit of 11-character intermodal shipping container numbers.
Notice: engineering verification utility. Use test or de-identified data and verify results independently before relying on them.
How it works
Standard: ISO 6346 Bureau International des Containers (BIC)
Formula: Sum of letter/digit weighted values modulo 11 check digit verification
Checks: 4 letters owner code + 6 digits serial + 1 check digit
Calculated locally in browser memory; nothing leaves your browser.
Deterministic local-first client-side execution. Provided as-is without warranty.