UN Number
A four-digit United Nations identifier assigned to dangerous goods or groups of substances.
Last reviewed: 30 September 2026
Professional definition
A four-digit United Nations identifier assigned to dangerous goods or groups of substances. Its precise legal, operational or charging effect depends on the applicable contract, carrier terms, route, jurisdiction and transport mode.
Example
Example: a logistics team records or applies “UN Number” in the relevant booking, document, quotation or shipment milestone.
Where it is used
Used in dangerous goods operations, documents, systems and commercial discussions.
Common mistakes and things to remember
Confirm the precise meaning in the governing contract, tariff, official rules and provider terms; industry usage can vary.
Source
Use the linked authority and applicable national guidance for current requirements.