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What is my DOT number?
In general, companies that do the following are required to have interstate Operating Authority in addition to a DOT number:
FMCSA operating authority is often identified as an "MC," "FF," or "MX" number, depending on the type of authority that is granted. Unlike the USDOT Number application process, a company may need to obtain multiple operating authorities to support its planned business operations. Operating Authority dictates the type of operation a company may run and the cargo it may carry.