Container Number Check
Validate a shipping container number against ISO 6346 rules in seconds. Paste the full code or enter the first 10 characters to calculate the control digit automatically.
Try the validator
Example: MSCU1234566
What we check
We verify the owner code, equipment category, serial number, and the final control digit based on the ISO 6346 weighting algorithm.
What you can enter
Either the full 11-character code or just the first 10 characters if you only need the expected check digit.
Need more than validation?
Contpark helps terminal and depot teams reduce numbering mistakes, speed up gate operations, and keep container data consistent across workflows.
See It in ActionQuick FAQ
It is the standard international identification code for freight containers: three owner letters, one equipment category letter, six serial digits, and one check digit.
U is a freight container, J is detachable freight container-related equipment, and Z is a trailer or chassis.
Because the final digit is not random. It is calculated from the first 10 characters, so even one wrong letter or digit changes the expected result.