Carriers, brokers and the vendors who sell to them use "DOT number" and "MC number" almost interchangeably. They are different records, and knowing which one a carrier has tells you a lot about what it does and what it still needs.
What a USDOT number is
A USDOT number is the identifier FMCSA uses to track a company's safety record: inspections, crashes, audits and compliance reviews. A company gets one by registering with FMCSA and filing the MCS-150 form, which reports its address, fleet size, drivers, operation type and cargo.
You generally need a USDOT number if you operate commercial motor vehicles in interstate commerce and a vehicle:
- has a gross vehicle weight rating or gross combination weight rating of 10,001 pounds or more,
- is designed or used to carry 9 to 15 passengers for compensation, or 16 or more passengers in any case, or
- hauls hazardous materials in a quantity that requires placards.
Many states also require a USDOT number for intrastate commercial vehicles, which is why the registry includes so many contractors, landscapers and other trades that never cross a state line.
What an MC number is
An MC number is a docket number for operating authority: FMCSA's permission to operate as a for-hire carrier transporting regulated commodities across state lines for compensation. Brokers and freight forwarders need their own authority too, under the same docket system.
A private carrier hauling its own goods needs a USDOT number but not operating authority. A for-hire interstate trucking company needs both.
Side by side
| USDOT number | MC number (operating authority) | |
|---|---|---|
| What it identifies | The company, for safety oversight | Permission to operate for hire across state lines |
| Who needs it | Interstate CMV operators and many intrastate ones | For-hire interstate carriers of regulated freight, brokers, forwarders |
| Filed with | MCS-150 registration | Operating authority application |
| Extra requirements | Biennial MCS-150 update | Insurance filing, BOC-3 process agent, protest period |
FMCSA has announced plans to move toward the USDOT number as the single identifier as part of its new registration system. Check FMCSA for the current status before you build a process that depends on MC numbers.
Why the difference matters when you sell to carriers
A new USDOT registration with the "authorized for hire" classification usually means a carrier that has also applied, or is about to apply, for operating authority. That carrier has a short list of things it must line up before it can work:
- liability insurance filed with FMCSA,
- a BOC-3 process agent designation, and
- in practice, a way to find loads and get paid.
That's why insurance agents, process agents, dispatchers and factoring companies all chase new authorities. A private carrier with a USDOT number has a different set of needs, closer to a fleet buyer than a new trucking business.
How to look up a carrier
The FMCSA SAFER Company Snapshot shows a carrier's USDOT status, operating authority, fleet size and inspection summary. It's built for one lookup at a time.
If you need lists rather than lookups, TruckerFetch lets you filter the FMCSA Company Census by classification, operation, state, cargo and fleet size, shows each carrier's docket numbers as reported, and publishes new registrations every morning.