MC number
An FMCSA 'motor carrier' operating-authority number that shows a carrier is authorized to haul regulated freight for hire across state lines.
An MC (Motor Carrier) number, also called a docket number, is granted by the FMCSA and represents a carrier's operating authority — its legal permission to transport regulated commodities for hire in interstate commerce.
A carrier can have a DOT number without an MC number (for example, private fleets or purely intrastate operators), but for-hire interstate carriers of regulated freight generally need both.
Related terms
DOT number
A unique identifier the U.S. FMCSA assigns to a commercial motor carrier; it's the primary key for tracking a carrier's safety, registration and inspection record.
Operating authority
FMCSA permission that defines what kind of freight or passengers a carrier may transport for hire — common, contract or broker authority.
Carrier vs broker
A carrier physically transports freight with its own equipment; a broker arranges transportation between shippers and carriers without hauling it.