MC Number vs DOT Number: Federal Carrier IDs Explained

USDOT number: the entity identifier

The USDOT number is a unique identifier assigned by the Federal Motor Carrier Safety Administration to every entity subject to FMCSA regulation. It’s the primary key for safety monitoring across crash data, inspections, audits, and compliance reviews. Under MAP-21 (the Moving Ahead for Progress in the 21st Century Act of 2012), all FMCSA-regulated entities are required to have a USDOT number.

USDOT numbers are 1 to 8 digits with no prefix, displayed on the side of commercial motor vehicles. Example display:

Who needs a USDOT number

• Operating a commercial motor vehicle (CMV) in interstate commerce with a gross weight, GCWR, or GVWR of 10,001 lbs or more.
• Operating a CMV designed or used to transport 9+ passengers including the driver.
• Transporting hazardous materials in a quantity requiring placarding.
• Operating as a for-hire carrier in interstate commerce.
• Operating as a broker or freight forwarder.
• Most intrastate carriers in states that have adopted USDOT requirements at the state level (which is most states).

MC number: operating authority

The MC number is FMCSA’s docket number assigned to a specific operating authority. It tracks the regulatory proceedings around granting, suspending, or revoking the operating authority — it is not, technically, an identifier of the operator itself. In practice, the MC number is widely used as if it were an operator ID, particularly in load-board and shipper-carrier transactions.

MC numbers display with the “MC-” prefix:

Variations on the MC prefix

Who needs an MC number

• For-hire interstate motor carriers transporting passengers or federally regulated property across state lines.
• Property brokers arranging interstate transportation for compensation.
• Freight forwarders assembling and tendering shipments under their own bill of lading.
• Some specialized carriers regulated under specific authorities.

The two-number model: most for-hire entities have both

Confusion arises because many entities have both a USDOT number AND an MC number. The standard for-hire trucking company has:

• A USDOT number for FMCSA safety monitoring of every CMV it operates.
• An MC number granting operating authority to transport other parties’ property for compensation across state lines.

A private carrier (a company hauling only its own goods in its own equipment) needs a USDOT number but does NOT need an MC number, because it’s not for-hire transportation. A small intrastate operator may have only a state-level ID.

How to verify on SAFER

FMCSA’s SAFER (Safety and Fitness Electronic Records) system is the public verification tool. Free, no login required.

1. Go to safer.fmcsa.dot.gov.
2. Use the “Company Snapshot” lookup.
3. Enter USDOT number, MC number, or company name.
4. Review the result for:
   • Operating authority status (Active, Inactive, Out of Service).
   • Operation classification (motor carrier, broker, freight forwarder).
   • Financial responsibility (cargo insurance and bond status).
   • Safety rating.
   • Recent inspection and crash history.

2026: FMCSA Motus modernization

FMCSA is rolling out a successor to the Unified Registration System (URS) called Motus. When Motus reaches all users in 2026, motor carriers, brokers, freight forwarders, and other regulated entities will:

• Create company accounts with full business verification at registration.
• Manage all registrations, updates, and filings (MCS-150 biennial updates, MCS-150B for hazmat, OP-1, BOC-3, financial responsibility filings) through the unified platform.
• Use authorized-user management for staff-level access to company filings.

USDOT numbers continue as the primary identifier across the transition. FMCSA has indicated that MC number issuance practices are under review; existing MC numbers continue to function. Watch fmcsa.dot.gov/registration for the latest schedule.

Why shippers should verify before tendering

Before paying a freight invoice or releasing freight to a carrier, verify authority. The five-second SAFER lookup catches:

• Inactive authority. Operator’s MC number is no longer active (revoked, suspended, voluntarily surrendered).
• Out-of-service safety rating. Operator has been placed out of service for safety violations.
• Insurance lapse. Cargo insurance or bond not currently on file.
• Authority mismatch. Entity name and contact don’t match what they’re telling you.

Why carriers should verify brokers

Same logic, the other direction. Before hauling a load, verify the broker’s authority is active and bond/trust is on file. The post-2026 financial responsibility rule with its 7-day suspension trigger means brokers can drop below the $75,000 minimum quickly and get suspended; running SAFER before a load doesn’t prevent every problem but eliminates the obvious ones.

Common questions about display and use

Do MC numbers go on the truck?

USDOT numbers are required on the truck per 49 CFR 390.21. MC numbers are not required to be displayed on the truck but many carriers display them. Lettering minimum height: 2 inches.

Can I sell or lease my MC or USDOT number?

No. FMCSA explicitly prohibits sale, purchase, or lease of USDOT or MC numbers. Authority is granted to a specific entity and isn’t transferable as property. Acquiring an existing company to inherit its authority is a different matter and follows a regulatory process.

What happens to my MC number if my company changes name?

Name changes are filed with FMCSA and the existing MC number transfers to the new name. Ownership changes are subject to additional review and may require new authority.

Related ATI freight resources

Need NMFC classification? Use the ATI freight class calculator.