What does an MC number mean?
An MC (Motor Carrier) number is the FMCSA-issued operating authority that lets a carrier haul freight across state lines for compensation, distinct from the USDOT number which is just a registration ID — most for-hire interstate carriers hold both.
Every carrier the FMCSA tracks has a USDOT number — it's the umbrella registration, free to obtain, required for any commercial motor vehicle over 10,001 pounds operating interstate. The MC number is different: it's the operating authority that legally permits a carrier to haul freight for hire across state lines (or for hazmat / household goods, even intrastate). The MC application costs $300 in filing fees, takes 4-8 weeks to activate (including a mandatory 21-day public protest period), and requires the carrier to file BMC-91 insurance proof and a BOC-3 process-agent designation before the authority goes live. A carrier with USDOT but no MC is typically a private carrier (hauling only its own goods) or an intrastate carrier. A carrier with both can broker, lease equipment to other carriers, and hold any of three operating authority types: Common Authority (regulated general freight), Contract Authority (negotiated long-term shipper contracts), or Broker Authority (arranging freight for others without hauling it). The MC number persists with the carrier's identity — even if the company changes ownership or name, FMCSA generally allows the MC to transfer with proper filings rather than re-applying.
- What's the difference between MC and DOT numbers?USDOT is the FMCSA registration — every carrier with a commercial motor vehicle over 10,001 lbs needs one. MC is the operating authority — the permission slip to actually move freight for hire across state lines. You can have a USDOT without an MC (intrastate or private carriers); you cannot have an MC without a USDOT.
- Do all 50 states require an MC number?MC numbers are federal, not state. They authorize interstate for-hire operation everywhere FMCSA regulates. Some states (notably California, Texas, and New York) have additional state-level filings for intrastate-only carriers, but for any carrier crossing state lines with for-hire freight, the federal MC covers all 50 states + DC.
- How do I verify an MC number is active?Search by MC number at safer.fmcsa.dot.gov (the FMCSA SAFER system). Active authority shows 'AUTHORIZED FOR Property/HHG/Passenger.' Common reasons for inactive status: insurance lapse (BMC-91 cancellation), failure to file biennial Form MCS-150 update, or a CSA safety intervention. Every carrier on Yes Cap surfaces this status directly from FMCSA on each carrier page.