What Is A Docket 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.
FF number is assigned to freight forwarders.
MX number is assigned to carriers domiciled in Mexico.
MC number is for all other carriers and brokers.
For more information visit the Federal Motor Carrier Safety Administration's website