UN Number Finder — Identify the UN Number of any aviation part
Enter a part number or designation — get the UN number in 15 seconds.
What is a UN Number?
A UN number is a four-digit identifier assigned by the United Nations Sub-Committee of Experts on the Transport of Dangerous Goods to substances and articles that are regulated for transport. The list of UN numbers — the "UN Dangerous Goods List" — is the backbone of every modal regulation: IATA DGR for air, IMDG for sea, ADR for road and RID for rail. A UN number unambiguously identifies the proper shipping name, hazard class, packing group and applicable packing instructions of a regulated good. Without a correct UN number, a dangerous goods shipment cannot legally enter the air transport network.
Why UN numbers matter in aviation logistics
In aviation, the UN number drives every downstream decision: whether the part is permitted on passenger or cargo aircraft, which packing instruction applies, what labels and marks the package must bear and what data must appear on the IATA Dangerous Goods Declaration. In an AOG context, an incorrect UN number can mean the difference between a part arriving on the next flight or being stuck at origin for days. Correct UN identification is therefore the single highest-leverage step in any MRO dangerous goods workflow.
Most common UN numbers in aviation MRO
| UN Number | Description |
|---|---|
| UN3480 | Lithium Ion Batteries |
| UN1072 | Oxygen, Compressed |
| UN1950 | Aerosols |
| UN1044 | Fire Extinguishers |
| UN2795 | Batteries, Wet, Filled with Alkali |
| UN3356 | Oxygen Generator, Chemical |
Frequently Asked Questions
How do I find the UN number of a part?
The UN number for an aviation part is listed in Section 14 of its Safety Data Sheet. DG Copilot automates this lookup: enter the part number or designation and the engine retrieves the SDS, parses Section 14 and returns the UN number, hazard class and air transport status in seconds.
What if my part number returns no UN number?
No UN number means the article is most likely NOT classified as a dangerous good for transport. DG Copilot will return a clear NOT DG result with the supporting rationale, which you can save as evidence for your shipping file.
Is a UN number the same as a CAS number?
No. A CAS number identifies a chemical substance for regulatory and scientific purposes. A UN number identifies a dangerous good for transport. A single CAS substance can map to several UN numbers depending on concentration, packaging or state, and a UN number can cover many CAS substances sharing the same hazard profile.
Do all dangerous goods have a UN number?
Yes. Every substance or article regulated for transport under the UN Model Regulations — and therefore under IATA DGR for air transport — is assigned a 4-digit UN number from the Dangerous Goods List. If a product genuinely has no UN number assigned, it is not a regulated dangerous good for transport.
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Related guides
This information is provided for guidance only. Always verify against the current IATA DGR edition. Final DGD must be validated by a certified DG specialist.