Comparison
MC number vs DOT number identity versus permission
They are not two names for one thing, and confusing them is how a load ends up with a company that was never allowed to take it.
The difference in one line
The USDOT number is identity. The MC number is permission. One says who the company is in the federal system; the other says what it may legally do. Every company operating commercial vehicles needs the first. Only companies hauling or arranging regulated freight for hire across state lines need the second.
Side by side
- Format. USDOT is plain digits (264184). MC is a docket with a prefix (MC-133655).
- Cost. The USDOT number is free. Operating authority carries a federal filing fee per authority type.
- What it can do. A USDOT number cannot be "revoked" the way authority can; the record simply goes inactive if filings lapse. Authority is granted, suspended and revoked as a distinct process.
- How many. One USDOT number per company. Potentially several authorities — common, contract, broker — each with its own status.
- What it proves about insurance. Neither, by itself. Insurance is a separate filing, and it can fall below the required amount while both numbers still look fine.
Why the pair matters more than either number
The single cheapest check in carrier vetting is confirming that the MC number and the USDOT number you were given belong to the same legal name, and that the name matches the company you have been emailing. Every docket resolves to a USDOT number; if it resolves to someone else, you have learned the most important thing available to you that day.
This is not a hypothetical failure mode. Borrowed identity is the crude, common version of double brokering, and it is defeated by one lookup.
Which do I ask for?
Ask for both, then check them against each other rather than trusting either. If a company can only give you one, ask why: a carrier hauling regulated freight for hire without authority, or a party brokering freight without broker authority, is telling you something before the load ever moves.
Questions
Can a company have a DOT number but no MC number? +
Yes, and it is common. Private fleets moving their own goods and carriers hauling only exempt commodities operate on a USDOT number alone.
Can a company have an MC number but no DOT number? +
Effectively no, for anything current. Some very old dockets exist in the record without a USDOT number attached, which is why a lookup on such a docket can come back thin.
Which number goes on the truck? +
The USDOT number, along with the legal name or DBA of the company operating the vehicle. Marking rules are about identity, which is the USDOT number’s job.
If the authority is active, is the insurance fine? +
Not necessarily. They are separate filings and they disagree more often than people expect — which is why this site shows the amount on file next to the amount required, rather than a single pass-or-fail.