Container Number (ISO 6346) Checksum Validator
Validate 11-character intermodal shipping container codes using the ISO 6346 Modulo 11 weighted algorithm.
Sample Containers:
Valid ISO 6346 Container Number
Owner Code: CSQ
Category: U (Freight)
Serial Number: 305438
Check Digit: 3 (Expected: 3)
FAQ
Frequently Asked Questions
Everything you need to know about this tool
ISO 6346 is the international standard for coding, identification, and marking of freight shipping containers. An 11-character container number consists of: 3-letter Owner Code, 1-letter Equipment Category (U for all freight containers), 6-digit Serial Number, and 1-digit Check Digit calculated via ISO 6346 Modulo 11 algorithm.
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