The basics5 min read
DOT number, MC number, authority: three different things
A company can have a federal ID and still not be allowed to haul your freight. This is the mix-up that fraudulent carriers count on.
DOT number
The Department of Transportation number is an identity. Private fleets that only haul their own goods often have one. It lets inspectors attach roadside inspections and crashes to the right company. Having a DOT number does not mean the company is allowed to haul freight for hire.
Operating authority
If a carrier or broker moves regulated freight across state lines for money, it generally needs active operating authority from FMCSA. For years that authority came with an “MC” number. FMCSA has been moving off the MC prefix, which is why you will hear both “MC” and “authority” for the same idea. What matters is the status: authorized, not revoked, not inactive.
Insurance
Authority stays active only while the required insurance filing is in place. When insurance lapses, authority is supposed to go with it. A PDF certificate emailed by a dispatcher can be edited. The filing FMCSA shows is the one that counts. This is also why a chameleon company is in a hurry: new authority, just enough insurance to book a load, then gone.
Sources
The Ro-Mac Brief summarizes public reporting for a general reader. Figures can be revised by the agency that published them. This is not legal advice.
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