GlossaryEN1 min readUpdated: Jun 26, 2026
ISO Container Code
The ISO Container Code is the complete, standardised identification system for shipping containers defined by ISO 6346, not simply a serial number.
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Source: https://www.iso.org/standard/20453.html
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Definition & Explanation
The ISO Container Code is the complete, standardised identification system for shipping containers defined by ISO 6346, not simply a serial number. It consists of eleven alphanumeric characters: a four-character owner code (three letters identifying the operator plus the equipment category identifier, typically 'U' for freight containers), a six-digit serial number, and a check digit. For example, HLCU 123456 7 indicates a Hapag-Lloyd unit. This globally uniform system allows unambiguous identification and tracking of every container across all carriers, terminals, and logistics networks. Terminals, shipping lines, and customs systems rely on the ISO container code for automated data capture—via OCR or RFID—and as a key reference in electronic cargo and customs documents.
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