GlossaryEN1 min readUpdated: Jun 25, 2026
ISO Freight Cargo Marking Requirements
Freight forwarders, shippers, and logistics operators apply ISO marking requirements at every stage of the cargo handling process – most notably ISO 6346, which defines the globally recognized identification system for freight containers.
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Source: https://www.iso.org/standard/20453.html
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Freight forwarders, shippers, and logistics operators apply ISO marking requirements at every stage of the cargo handling process – most notably ISO 6346, which defines the globally recognized identification system for freight containers. The standard mandates a four-letter owner code, an equipment category identifier, a six-digit serial number, and a check digit, giving every container a unique, machine-readable identity worldwide. Additional markings covering gross weight, tare, dimensions, and hazardous material labels are required where the cargo demands it. Proper compliance underpins customs clearance, end-to-end shipment tracking, and liability allocation across the supply chain. Incomplete or incorrect markings can trigger delays, financial penalties, and – where dangerous goods are involved – serious safety incidents.
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