Before you can legally operate a commercial motor vehicle in interstate commerce, you need a USDOT number. Here is everything you need to know about it — in plain English. Once you have your USDOT number, the next step is getting your MC authority and building your carrier packet to start working with freight brokers.
What is a USDOT number?
A USDOT number (United States Department of Transportation number) is a unique identifier assigned to commercial motor carriers by the FMCSA. Think of it as your trucking business's federal ID number. It is used to track your safety record, inspections, crashes, and compliance history — including your CSA safety score.
Every freight broker will ask for your USDOT number before giving you a load. It goes on your carrier packet, your truck's door, and every load document you touch.
Who needs a USDOT number?
You need a USDOT number if you operate a commercial vehicle in interstate commerce and any of these apply:
- Your vehicle has a gross vehicle weight rating (GVWR) over 10,001 lbs
- You transport hazardous materials requiring placards
- You transport more than 8 passengers for compensation
- You transport more than 15 passengers not for compensation
For most owner-operators with a semi truck, box truck, or hotshot rig — you need one. Read our guide on hotshot trucking getting started if you are planning a hotshot operation.
USDOT number vs MC number — what is the difference?
- USDOT number: Identifies you as a motor carrier for safety purposes. Required for most commercial operators. Free to get.
- MC number (Motor Carrier number): Gives you authority to transport regulated commodities for hire across state lines. Required if you want to haul freight for brokers. Costs $300 to apply.
You need both. Most owner-operators apply for them at the same time. Read our full guide on how long it takes to get MC authority so you know what to expect.
How to get a USDOT number — step by step
- Go to safer.fmcsa.dot.gov/urs/ — the FMCSA Unified Registration System
- Click Apply for New USDOT Number
- Fill in your business information — legal name, address, EIN, vehicle type
- Answer questions about your operations (interstate, intrastate, commodity types)
- Submit — your USDOT number is issued immediately online
- Print or save your confirmation
The application is free. The process takes about 20-30 minutes.
What happens after you get your USDOT number?
- Apply for MC authority if you want to haul for brokers — costs $300
- Wait for the 10-day protest period before your MC authority activates
- Get your insurance filed with the FMCSA — minimum $750,000 auto liability
- Build your carrier packet to send to brokers
- Review our checklist of all documents needed before your first load
Where does your USDOT number go on your truck?
Once you have your number it must appear on both sides of your truck in letters at least 2 inches tall, along with your company name. Format: USDOT 1234567. This is a federal requirement — not optional.
How to look up any USDOT number
Go to safer.fmcsa.dot.gov and search by USDOT number or company name. You can verify your own number and check any carrier's safety record — including their CSA score — the same way brokers check yours.