Dangerous Goods Transport Identifiers
UN Numbers identify hazardous materials for transport under the DOT Hazardous Materials Table. Each number carries a hazard class, packing group and labeling requirement that determines how the shipment must move.
Source: 49 CFR 172.101 — Hazardous Materials Table (eCFR)The 2324 UN Numbers in the Hazardous Materials Table are grouped into 20 transport hazard classes and divisions.
Flammable Liquid
404 codes
Radioactive Material
20 codes
Corrosive Material
281 codes
Miscellaneous Hazardous Material
39 codes
Mass Explosion Hazard
143 codes
Projection Hazard
64 codes
Fire Hazard
60 codes
Minor Explosion Hazard
105 codes
Very Insensitive Explosives
3 codes
Extremely Insensitive Articles
1 code
Flammable Gas
73 codes
Non-Flammable, Non-Poisonous Gas
79 codes
Gas Poisonous by Inhalation
86 codes
Flammable Solid
123 codes
Spontaneously Combustible Material
77 codes
Dangerous When Wet Material
88 codes
Oxidizer
135 codes
Organic Peroxide
21 codes
Poisonous (Toxic) Material
520 codes
Infectious Substance
5 codes
The Hazardous Materials Table leaves the class blank for these entries; it is assigned in writing by the testing agency (49 CFR 173.56(d)(1)), so they are not on any class list.
UN Numbers classify transport hazard, not waste status — a shipment may also need an EPA RCRA code or a Basel Convention code for cross-border waste shipments.
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