DOT Number Registration: How to Get a USDOT Number for Your Trucking Company

By CarrierLens Compliance Team • Last updated: 2025-04-20

A USDOT number is the unique identifier assigned by FMCSA to every motor carrier subject to federal safety regulation. It's required before any other federal trucking registration — MC authority, insurance filings, IRP/IFTA registration — and it's what FMCSA uses to track your safety history, compliance record, and inspection results. Registration is free and can be completed online, but the compliance obligations that begin the moment you receive your USDOT number are anything but simple. This guide covers the full registration process, who needs a number, what it unlocks, and what you must do within the first year of operating under it.

What Is a USDOT Number?

The USDOT number (also called a DOT number or DOT #) is a unique identifier FMCSA assigns to commercial motor vehicle operators in interstate commerce. It appears in FMCSA's SAFER database, which is publicly accessible and used by shippers, brokers, insurance companies, and law enforcement to verify a carrier's safety rating, insurance status, and compliance history. Every carrier's USDOT number is linked to their Motor Carrier Identification Report (MCS-150), which contains basic carrier information, and to their safety and compliance record.

Who Needs a USDOT Number?

You must register for a USDOT number if you operate commercial motor vehicles in interstate commerce and meet any of these thresholds:

Intrastate operations: Some states require a USDOT number for intrastate carriers (operations entirely within one state). California, for example, requires DOT numbers for vehicles over 10,001 lbs regardless of whether they cross state lines. Check with your state DOT or DMV for intrastate thresholds.

Who is exempt: Private carriers transporting their own goods in vehicles under 10,001 lbs GVWR in intrastate operations only. Carriers exclusively transporting agricultural commodities may qualify for exemptions under 49 CFR §390.38. Confirm with FMCSA or a compliance specialist before assuming an exemption applies.

USDOT Number vs. MC Number: What's the Difference?

Private carriers who only haul their own goods need a USDOT number but do not need an MC number. For-hire carriers need both. Carriers transporting exempt commodities (certain agricultural products, newspapers, livestock) are also exempt from MC authority requirements but still need a USDOT number.

How to Register for a USDOT Number: Step-by-Step

1. Go to FMCSA's Unified Registration System (URS): The registration portal is at safer.fmcsa.dot.gov/urs/registerNewCarrier.do. The system is available 24/7 and registration takes 15–30 minutes for most applicants.
2. Create an account: You'll need an email address and will create login credentials. Keep these — you'll use this account for future MCS-150 updates and MC authority applications.
3. Complete the MCS-150 (Motor Carrier Identification Report): This is the core registration form. Information required includes: legal company name, principal business address, phone number, company structure (corporation, LLC, sole proprietor), total number of CDL drivers, total power units (tractors), operation type (carrier, broker, freight forwarder), and cargo classifications.
4. Submit and receive your USDOT number: For most applicants, the USDOT number is assigned immediately or within 24 hours. You'll receive it by email and it will appear in the SAFER database.
5. Display your USDOT number on your vehicles: 49 CFR §390.21 requires every CMV subject to FMCSA regulations to display the carrier's USDOT number on both sides of the cab or vehicle body. The marking must be legible, in letters at least 2 inches high (3 inches recommended), in a color that contrasts with the background, and include your legal or trade name. Magnetic signs are acceptable.

The MCS-150 Biennial Update Requirement

Receiving a USDOT number creates an ongoing obligation: you must update your MCS-150 every two years, whether or not any of your information has changed. Updates are due in the month your USDOT number was issued, every even or odd year (depending on when you registered). The biennial update window is your birthday month plus or minus one month (so a 3-month window total).

Missing the biennial update deactivates your USDOT number. A deactivated USDOT number means:

• Your operating authority (MC number) may be revoked
• Vehicles displaying a deactivated USDOT number can be placed out of service during roadside inspections
• Insurance filings linked to your USDOT number may lapse

Reactivation requires completing the MCS-150 update — but the gap in active status is recorded in your compliance history. FMCSA does not send reminders for biennial updates. Carriers must track their own update deadlines.

What Compliance Obligations Begin After Registration?

The moment you receive your USDOT number and begin operations, several compliance clocks start running:

• Drug and alcohol testing program: Must be established before any CDL driver performs safety-sensitive functions. Pre-employment drug tests required before first duty. Random testing pool enrollment required before operations begin.
• Driver qualification files: Must be established for every CDL driver before they begin driving. A complete DQF includes 10+ documents — employment application, CDL copy, MVR, physical certificate, pre-employment drug test, and others.
• Accident register: 49 CFR §390.15 requires maintaining an accident register for 3 years, listing every accident involving your CMVs that resulted in a fatality, bodily injury, or vehicle towing.
• Vehicle inspection, repair, and maintenance records: Required under 49 CFR Part 396. Periodic inspection required at least annually for all CMVs.
• Hours of Service records: HOS logs (electronic or paper, depending on exemption status) must be maintained from the first day of operations.
• New entrant safety audit: Expect an FMCSA safety audit within the first 12 months of operations. Failing to be audit-ready can result in loss of operating authority.

USDOT Number Deactivation, Reactivation, and Transfer

Voluntary deactivation: If you cease operations, you can voluntarily deactivate your USDOT number through the URS portal. A deactivated number cannot be used for operations but preserves your compliance history for 3 years.

FMCSA-initiated deactivation: FMCSA can deactivate a USDOT number for failure to complete a biennial update, failure to respond to a compliance review, or imminent hazard order. Reactivation requires completing the missing obligation.

Transfer: USDOT numbers are not transferable between legal entities. If you change your business structure (e.g., from sole proprietor to LLC), you must apply for a new USDOT number for the new entity. The old number's compliance history is linked to the original entity.

See our complete new carrier compliance checklist for the full sequence of registrations required before your first load, or our BOC-3 filing guide for the next required step after receiving your MC number.