|  Operating Authority (MC/FF/MX Number)  The operating authority (MC/FF/MX number) is assigned to interstate for-hire motor carriers and brokers that apply for operating authority. These numbers are   also referred to as docket numbers. The FF number is assigned to freight   forwarders; the MX number is assigned to carriers domiciled in Mexico; and the   MC number is for all other carriers and brokers. << Back to Product & Services page  |