Why an MC number matters when you ship a car
An MC number matters because it belongs to a named category of authority, and that category decides whether a company is registered to book your shipment or to drive it. Under 49 U.S.C. 13901(a), registration is required before a person provides transportation as a motor carrier, service as a freight forwarder, or service as a broker. A company that shows you a number without naming which of those three it registered for has confirmed a registration exists, not what it actually permits.
How a company gets an MC number
A company gets an MC number by applying for one named type of operating authority and passing a review, not by requesting a number. 49 CFR 365.101 governs applications for certificates of motor carrier registration, for permits to operate as a freight forwarder, and for licenses to operate as a broker of motor vehicle transportation. Arranging freight and hauling it are different applications on the federal side, so a business that wants to do both has to apply twice.
49 CFR 365.107 splits those applications further, listing motor carrier of property, broker of general commodities or household goods, motor carrier of household goods, and temporary authority as separate types, all filed on Form MCSA-1. Household goods authority is its own category, so it's worth reading a company's actual authority rather than inferring it from their advertising.
49 CFR 365.109 requires FMCSA staff to review the application for correctness, completeness and adequacy of the evidence, to reject applicants carrying an Unsatisfactory safety fitness rating, and to publish a summary of the application in the FMCSA Register. The same section sets the financial-responsibility form by category, with a property broker filing a BMC-84 surety bond or a BMC-85 trust fund agreement and a property carrier filing a BMC-91, 91X or 82 within 90 days of that publication. The form on file therefore names the category independently of what a company calls itself.
MC number vs USDOT number
An MC number and a USDOT number come from different filings and answer different questions, one recording a grant of operating authority and the other identifying a carrier for safety oversight. 49 CFR 390.19T requires a motor carrier conducting operations in interstate commerce to file a Motor Carrier Identification Report, Form MCS-150, and states that FMCSA will issue the motor carrier or intermodal equipment provider an identification number (USDOT Number) once that form is processed. Confirming one number doesn't confirm the other, because neither filing produces the other.
| MC number | USDOT number |
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| What it records | a grant of interstate operating authority | an identification number tied to a filed identification report |
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| Federal text behind it | 49 U.S.C. 13901 and 49 CFR part 365 | 49 CFR 390.19T |
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| How it is applied for | a certificate, permit or license application under 49 CFR 365.101, on Form MCSA-1 | Form MCS-150 under 49 CFR 390.19T(a)(1) |
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| Categories named in that text | motor carrier of property or passengers, freight forwarder, broker, household goods, temporary authority | motor carriers and intermodal equipment providers |
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| How many a company holds | one for each authority registered, under 49 U.S.C. 13901(b)(1) | one issued on processing the report, under 49 CFR 390.19T(h)(1) |
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A brokerage is regulated as a brokerage no matter what number sits in its footer. 49 CFR 371.1 applies Part 371, titled Brokers of Property, to all brokers of transportation by motor vehicle as defined in 49 CFR 371.2. The rules that reach a company follow the authority it holds, not the format of its number.
Whether MC numbers are being replaced by USDOT numbers
The federal rule that would move motor carrier, broker and freight forwarder registration onto one online form is written but not in force. 49 CFR 390.201, the Unified Registration System section, would require motor carriers, brokers, freight forwarders and intermodal equipment providers to file Form MCSA-1 both to identify their operations for safety oversight and to obtain operating authority, and the section carries an effective-date note stating that it was suspended indefinitely at 88 FR 80184, effective November 17, 2023. If someone tells you one number has replaced the others, check the registration record yourself rather than take their word for it.
Statute still requires a number per authority. 49 U.S.C. 13901(b)(1) requires the Secretary to issue a distinctive registration number to a registered person for each authority that person is registered for, and 13901(b)(2) requires that number to include an indicator of the type of transportation or service. The letters MC appear nowhere in 49 U.S.C. 13901, so the familiar prefix is a naming convention sitting on top of a numbering requirement the statute states in general terms.
