A USDOT number is the unique number FMCSA assigns to a carrier, and every inspection, crash and audit on its record is filed under it. Enter one to see the carrier's FMCSA record: who it is and what authority it holds, insurance on file, inspections, crashes, safety against peer carriers, the fleet, and where it runs.
USDOT numbers, explained
What is a USDOT number?
It's the unique identifier FMCSA assigns to a carrier and uses to collect and monitor its safety information across roadside inspections, crashes, audits, and compliance reviews. When you pull a carrier's inspection and crash history, it all hangs off this one number.
Who needs a USDOT number?
Generally, any company running a commercial vehicle in interstate commerce that weighs 10,001 pounds or more, is designed or used to carry passengers in the numbers FMCSA specifies, or hauls placardable quantities of hazardous materials. Many states also require one for intrastate carriers.
Can a USDOT number be transferred or reused?
No. A USDOT number stays with the same legal entity for life, through name, address, and owner changes. It can't be transferred, and a new legal entity, including a successor formed by a sale, merger, or change of business form, needs its own number. That permanence is part of what makes it useful for vetting: operating authority (an MC number) can change hands, but the USDOT number can't.
USDOT number vs MC number
A USDOT number identifies the carrier; an MC number is for-hire operating authority. Many carriers have a USDOT number and no MC number. For the full breakdown, see USDOT number vs MC number, or run a free MC number lookup.
USDOT number vs a state DOT number
Some states issue their own DOT or intrastate number to carriers that operate only within that state. It's separate from the federal USDOT number, and a state number won't resolve in the national FMCSA record. For interstate vetting, you want the federal USDOT number.
Is the USDOT number changing under Motus?
No. FMCSA's new Motus registration system continues to use the USDOT number as the single unique identifier for all regulated entities. More in USDOT vs MC, and what Motus changes.
What you see when you look up a USDOT number here
From that single number, fleetfax assembles the carrier's full profile: who the carrier is and what authority it holds, insurance on file, safety against peer carriers, the inspection and crash record, the fleet it runs, and where it operates. Enter a number above to run one. New to the terms? The carrier vetting glossary defines every field on the report.
Sources
- FMCSA, Do I Need a USDOT Number?
- FMCSA, Are USDOT numbers transferable?
- Federal Register, Availability of Motus (Apr 29, 2026).
fleetfax reads public FMCSA data and is not affiliated with FMCSA or the U.S. Department of Transportation.
