If you've spent any time in the trucking or freight industry, you've heard both terms. MC number. DOT number. They're both on FMCSA records, both used to identify carriers, and yet they serve very different purposes. Here's what you need to know.
CarrierCheck accepts both DOT and MC numbers — just enter either one and you'll get the full carrier record.
What Is a DOT Number?
A USDOT number (United States Department of Transportation number) is a unique identifier assigned by FMCSA to commercial motor vehicles and carriers for the purpose of safety monitoring and compliance. It's used to track a company's safety record, inspections, crashes, and audits.
Think of the DOT number as the carrier's safety identity. It's how FMCSA keeps track of their safety performance over time.
Safety & Compliance ID
Required for most commercial carriers. Used to track safety ratings, inspections, crashes. Displayed on the side of every commercial truck.
What Is an MC Number?
An MC number (Motor Carrier number) is an operating authority number issued by FMCSA. It gives a carrier the legal right to transport goods for compensation across state lines. It's sometimes called a "docket number."
Think of the MC number as the carrier's operating license. Without an active MC number, a carrier cannot legally haul freight for hire in interstate commerce.
Operating Authority ID
Required for for-hire carriers in interstate commerce. Represents the legal permission to transport goods commercially. Must be Active to operate legally.
Key Differences at a Glance
- DOT Number — tracks safety and compliance. Required for most commercial vehicles regardless of whether they haul for hire.
- MC Number — grants authority to haul for hire. Required specifically for commercial carriers transporting goods across state lines for compensation.
- A carrier can have a DOT number without an MC number — if they only haul their own goods (private carrier).
- A for-hire carrier needs both — DOT for safety monitoring, MC for operating authority.
Which One Should You Search?
Both numbers will find the same carrier record. However:
- Use the DOT number when you want to look up their safety rating and crash history
- Use the MC number when you want to verify their operating authority status specifically
- When in doubt, use whichever number the carrier gave you — both work
Just because a carrier has a DOT number doesn't mean they have authority. Always verify their MC number status is Active before booking a load. A DOT number alone does not authorize them to haul freight for hire.
What Do They Look Like?
DOT numbers are typically longer — usually 7 or 8 digits (e.g. 3359426). MC numbers are usually shorter — 6 or 7 digits and prefixed with "MC" (e.g. MC 1699075). CarrierCheck auto-detects which type you're entering based on the length, but you can also select manually using the dropdown.
Bottom Line
DOT number = safety identity. MC number = operating license. For-hire carriers need both. When vetting a carrier, always verify their MC number shows Active authority — the DOT number alone doesn't tell you if they're legally allowed to haul your freight.