# ISO Freight Cargo Marking Requirements

*Last updated: 2026-06-25*

> 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.

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.

**Source:** [https://www.iso.org/standard/20453.html](https://www.iso.org/standard/20453.html)

## Quick Facts

| Property | Value |
|---|---|
| Term | ISO Freight Cargo Marking Requirements |
| Language | EN |
| Word count | 113 |
| Last updated | 2026-06-25 |
| Source | https://www.iso.org/standard/20453.html |

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