MC number vs DOT number
A USDOT number identifies the company. An MC number is the operating authority that lets it haul or broker for hire. One says who they are; the other says what they are allowed to do — and they have separate statuses that can disagree.
| USDOT number | MC number | |
|---|---|---|
| What it is | An identifier for the company | A grant of operating authority |
| Answers | Who are you? | What may you do for hire? |
| Who needs one | Almost anyone running a commercial vehicle in interstate commerce | Anyone hauling or arranging freight for hire across state lines |
| Cost | Free | An application fee, plus insurance or a bond on file before it activates |
| Can it be inactive? | Yes — 50% of those ever issued are | Yes — 91,652 broker dockets are inactive |
| Revoked? | Not usually; it lapses | Routinely — 134,659 times in 2025 |
| Backed by money | No | Yes — a $75,000 bond for brokers, filed liability cover for carriers |
Why the difference bites
The failure mode is not "the number is fake". It is "the number is real, active, and for the wrong thing". A company with an active USDOT number and active carrier authority is not licensed to broker your load — and if they arrange it anyway, there is no broker bond behind the payment, because brokers are the ones who have to file one.
That is exactly the shape of a double-brokered load: a real carrier, a real number, a load they never intended to haul themselves. See double brokering red flags for the rest of the signals.
How to check both in one go
Enter either number in the lookup — it follows the link between them and reports both statuses, so you see the identifier and the authority together rather than having to cross-reference two searches.
Look up an MC number
Live FMCSA licensing, insurance and census data. Switch to DOT if that's the number you were given.
Questions
Which number should I ask a broker for?
Both, and check both. The MC number tells you whether they hold active broker authority; the USDOT number is the durable identifier that ties the company together across FMCSA's records. If someone will only give you one, it should still check out — but ask why.
Can a company have a DOT number but no MC number?
Yes, and plenty do legitimately: intrastate-only carriers and private fleets hauling their own goods need no for-hire authority. What matters is the match between what they hold and what they are asking to do. A company with no broker authority arranging your load is brokering illegally.
Can one company have several MC numbers?
Yes. A company can hold separate dockets for carrier and broker authority, and some hold more than one for historical reasons. Our lookup follows the USDOT number to the dockets attached to it and prefers the MC one.
What are FF and MX numbers?
FF is a freight forwarder docket and MX is a Mexican carrier docket. Both appear in the same FMCSA datasets, and both can be entered into the lookup.