Understanding MC, FF, and MX Numbers

What Are FMCSA Docket Numbers?

When FMCSA grants operating authority, it assigns a unique docket number that identifies the type of authority and the specific entity holding it. These numbers -- MC, FF, and MX -- are distinct from the USDOT number and each represents a different category of interstate commercial activity. Understanding what each number means is essential for carriers, brokers, shippers, and freight forwarders navigating the federal regulatory system.

MC Number: Motor Carrier Authority

The MC (Motor Carrier) number is the most commonly referenced authority docket number. It is issued to entities authorized to transport regulated commodities for compensation in interstate commerce. There are several types of MC authority:

• Common carrier authority -- Allows a carrier to haul freight for the general public for compensation
• Contract carrier authority -- Allows a carrier to haul freight under specific contracts with individual shippers
• Broker authority -- Allows an entity to arrange transportation of freight by motor carriers for compensation (also uses the MC prefix)

Not all carriers need an MC number. Private carriers transporting their own goods, and carriers hauling exempt commodities (such as unprocessed agricultural products), may operate with only a USDOT number. Use TruckCodes carrier search to look up any MC number and verify its status.

When Do You Need an MC Number?

You need an MC number if you are a for-hire carrier transporting regulated commodities across state lines, or if you are operating as a freight broker arranging such transportation. Apply through FMCSA's Unified Registration System using the appropriate OP-1 form. Learn more about the application process in our authority types guide.

FF Number: Freight Forwarder Authority

The FF (Freight Forwarder) number is assigned to entities authorized to operate as freight forwarders in interstate commerce. A freight forwarder assembles and consolidates shipments, assumes responsibility for the transportation from origin to destination, and uses the services of underlying carriers to perform the actual movement of goods.

• Freight forwarders issue their own bill of lading to the shipper
• They are liable for the cargo from origin to destination
• They must maintain a $75,000 surety bond or trust fund (BMC-84 or BMC-85)
• A valid BOC-3 process agent designation is required

The FF number is applied for through the OP-1(FF) form filed with FMCSA.

MX Number: Mexican Carrier Authority

The MX number is issued to Mexico-domiciled motor carriers authorized to operate in the United States. These carriers must meet all the same safety standards as domestic carriers plus additional requirements specific to cross-border operations:

• Compliance with all applicable FMCSA safety regulations
• Valid insurance meeting US minimum financial responsibility requirements
• BOC-3 process agent designation
• Vehicle safety inspections at border crossings

MX authority is applied for using the OP-1(NNA) form for Non-North America domiciled carriers.

How These Numbers Work Together

A single company can hold multiple docket numbers. For example, a large logistics firm might hold an MC number for carrier operations and a separate MC number for brokerage operations. The USDOT number serves as the overarching identifier that links all authority docket numbers back to a single entity. Explore authority types to understand which combination you need, and visit the knowledge base for detailed application guides. Use our startup checklist to track each filing requirement.