Last updated: 10 August 2026
What this lookup shows you
Type a USDOT number or an MC docket number above. The result comes from the Federal Motor Carrier Safety Administration’s own system — the same register brokers, shippers and insurers check before they work with a carrier.
What you get back: the carrier’s legal name and DBA, whether it is authorized to operate, whether it is under an out-of-service order, fleet size, driver count, physical location and safety rating.
USDOT number vs MC number — they are not the same thing
Almost every carrier we speak to has been confused by this at some point, usually while filling in a broker packet.
- ✓ USDOT number. Your identity. Every carrier operating commercial vehicles in interstate commerce needs one. It follows the company for life and is what safety data is recorded against.
- ✓ MC number (operating authority). Your permission. Required if you haul regulated freight for hire across state lines. A carrier can hold a USDOT number and still have no active authority.
This distinction is where money gets lost. A broker will not tender a load to a carrier whose authority is inactive, revoked or still pending — even if the DOT number looks perfectly healthy.
What “not authorized” usually means
If the lookup comes back saying a carrier is not authorized to operate, it is normally one of these:
- ✓ Insurance lapsed. By far the most common cause. FMCSA revokes authority when the required filing — the BMC-91 or BMC-91X from your insurer — drops off. Reinstating the insurance usually restores the authority.
- ✓ No BOC-3 on file. Your blanket process-agent filing. Without it, authority never activates in the first place.
- ✓ Biennial update missed. The MCS-150 has to be refreshed on a two-year cycle. Miss it and FMCSA deactivates the DOT number.
- ✓ Still pending. New authority sits in a vetting period before it goes active.
- ✓ Revoked after an audit. Rarer, and more serious.
Why check a carrier before you work with them
If you are a broker, shipper or another carrier, this lookup is basic due diligence. Working with a carrier whose authority is inactive can leave a claim uninsured and a load unprotected. Thirty seconds here is cheaper than a cargo claim nobody will pay.
If it is your own number, check it before it costs you. Carriers routinely discover their authority went inactive weeks earlier — usually when a broker declines a load, which is the expensive way to find out.
The filings that keep your authority alive
- ✓ MCS-150. Biennial update of your carrier profile. Due on a schedule tied to your DOT number.
- ✓ BOC-3. Designation of process agents in every state. One-time, but it must stay on file.
- ✓ Insurance filings. Your insurer files proof of liability coverage with FMCSA directly. If the policy lapses, so does your authority.
- ✓ UCR registration. Annual, separate from all of the above, and separately enforceable at the roadside.
These are separate from your corporate filings with New York. A trucking company registered in New York carries both sets of obligations at once — and being current with one says nothing about the other.