Freight Glossary
Container Number – Meaning & Examples
A unique 11-character identification code for shipping containers (ISO 6346).
- Related terms
- container ID, ISO 6346, container identification
A container number is a unique identifier following ISO 6346 standard. It consists of: owner code (4 letters, first 3 indicate the company, 4th is always "U" for freight containers), serial number (6 digits), and check digit (1 digit). The check digit validates the number's accuracy. Container numbers are essential for tracking, documentation, and handling. Example: MSKU1234567 - MSK (Maersk) U (freight container) 123456 (serial) 7 (check digit).
Container Number examples
- Container CMAU2345678 belongs to CMA CGM and can be tracked using this number.
How Container Number is used in freight operations
Container Number appears in quotations, bookings, shipping documents, and tracking updates. Confirm how it applies to your shipment with your carrier, forwarder, or customs representative, because practice can differ by country and contract.
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Frequently asked questions
What is Container Number?
A unique 11-character identification code for shipping containers (ISO 6346).
What is an example of Container Number?
Container CMAU2345678 belongs to CMA CGM and can be tracked using this number.