A USDOT number is the unique identifier the U.S. Department of Transportation assigns to a commercial motor carrier. It follows the carrier for the life of the business and serves as the key that links together its registration, safety records, inspections, crash history, and audit results across federal systems.
Interstate carriers — and intrastate carriers in many states — are required to have and display an active USDOT number. It is distinct from an MC (motor carrier operating authority) number: the USDOT number identifies the company for safety-monitoring purposes, while the MC number grants the authority to haul regulated freight for hire across state lines.
When vetting a carrier, the USDOT number is the single most useful thing to have: enter it into FMCSA SAFER or QuoteFleet's live lookup and you can confirm the carrier's authority, insurance, and safety standing in seconds.
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