Definition
What is a USDOT number, and what does it prove?
A USDOT number identifies a company in the federal motor carrier system. It is free, it is permanent, and it is the key every federal record about that company is filed under — including the ones on this page.
The short answer
The US Department of Transportation, through FMCSA, assigns a USDOT number to a company that operates commercial vehicles. It is an identifier, not a licence: it says "this company exists in the federal system and its filings live here". It is issued free of charge and stays with the company.
Everything else — whether the company may legally haul freight for hire, whether it carries the required insurance, whether its authority has been revoked — is recorded under that number, not implied by it. That distinction is the single most common misunderstanding in carrier vetting.
What the number looks like
A USDOT number is a plain sequence of digits with no prefix — 264184, 80806, 3491211. Older companies have shorter numbers because they were assigned earlier; a seven-digit number simply means the company registered recently, and says nothing about its quality.
You will see it written as "USDOT 264184", "US DOT 264184" or just "DOT 264184". They are the same thing. It is not the same as an MC number, which is a separate identifier for operating authority.
Who is required to have one
The federal requirement applies to companies operating commercial vehicles in interstate commerce that meet any of these tests. Most states also require intrastate operators to have one, so the practical answer for a working fleet is usually yes.
- The vehicle has a gross vehicle weight rating, gross combination weight rating or actual weight of 10,001 pounds or more.
- It is used to transport passengers for compensation, in a vehicle designed for more than 8 people including the operator.
- It is used to transport more than 15 people including the operator, whether or not for compensation.
- It is used to transport hazardous materials in a quantity requiring placarding.
What a USDOT number does not tell you
Having a number is not the same as being permitted to haul regulated freight for hire — that is operating authority, recorded separately and often as an MC docket. An active USDOT record can sit alongside inactive authority, or authority with a revocation already pending.
The number also carries no quality judgment. There is no federal score attached to it and this site attaches none either: what you get is the filing, as filed, with the date it was read.
How to check one
Enter it above, or call the API. You will see the census record, all three authority types, insurance on file against the amount required, fleet size and the date of the last MCS-150 filing — the field that tells you how current the rest of it is.
Questions
How much does a USDOT number cost? +
The number itself is free. FMCSA does not charge to issue one. Costs arise around it — operating authority has a filing fee, and insurance and process-agent filings have their own — but the identifier is free.
Is a USDOT number the same as a DOT number? +
Yes. "DOT number" is the everyday shorthand; USDOT is the formal name. One number, one record.
Does a USDOT number expire? +
It does not expire, but the record attached to it goes inactive if the biennial MCS-150 update is not filed. That is the most common reason a company that is still operating shows an inactive status.
Can two companies share a USDOT number? +
No. One number belongs to one legal entity. If a docket or a rate confirmation points at a different legal name than the USDOT record does, that mismatch is the finding worth acting on.