What the USDOT Number Is
The USDOT number is the FMCSA\'s unique identifier for commercial motor carriers and other entities subject to federal motor carrier regulations. It is required for any commercial motor carrier that:
- Operates a truck with a gross vehicle weight rating (GVWR) of 10,001 pounds or more in interstate commerce, or
- Transports hazardous materials in interstate commerce, regardless of vehicle weight, or
- Transports passengers for hire in interstate commerce
The USDOT number is used to track:
- Operating status (active, inactive, revoked)
- Insurance filings (BMC-91, BMC-34)
- Crash and inspection history
- CSA scores in each BASIC category
- Out-of-service orders
- Hours of Service compliance and ELD records (in some contexts)
The USDOT number is the primary identifier you provide to brokers, shippers, and roadside enforcement. It is searchable on the FMCSA SAFER system.
What the MC Number Is
The MC (Motor Carrier) number indicates that the FMCSA has granted operating authority to a for-hire carrier. Operating authority is the federal permit to transport freight or passengers for compensation in interstate commerce. There are several types of authority indicated by different prefixes:
- MC: Standard motor carrier authority for for-hire transportation. Most common.
- FF: Freight forwarder authority. For entities that arrange freight movement but do not directly transport.
- MX: Mexican motor carrier authority. For Mexican-domiciled carriers operating in the US.
The MC number is what activates after the FMCSA processes your application and your insurer files the BMC-91. Without an active MC number, a for-hire carrier cannot legally haul freight in interstate commerce.
When You Need Each One
| Operating Profile | USDOT Required? | MC Number Required? |
|---|---|---|
| For-hire interstate carrier, general freight, GVWR over 10,001 lbs | Yes | Yes |
| For-hire interstate hazmat carrier (any size) | Yes | Yes |
| Private carrier interstate (own goods only), GVWR over 10,001 lbs | Yes | No |
| For-hire intrastate Texas only | Sometimes (depends on cargo and operations) | No |
| Owner-operator leased to motor carrier | Optional (carrier\'s USDOT applies during dispatch) | No (carrier\'s MC applies) |
| Hot shot operator, GVWR under 10,001 lbs, US-only | Often no | No |
The "interstate" threshold matters: any operation that crosses state lines (or is part of a continuous interstate trip even within one state) is subject to FMCSA jurisdiction. Texas intrastate-only operators are often exempt from FMCSA registration but still subject to TxDMV registration.
How USDOT and MC Numbers Get Issued
Both are obtained through the FMCSA Unified Registration System (URS). The process:
- Submit URS application at fmcsa.dot.gov/registration.
- Receive USDOT number immediately. It is assigned during the application.
- Receive MC number assignment if you are applying for operating authority. The MC number is assigned but not yet active.
- Pay $300 application fee for operating authority.
- FMCSA processes the application (20 to 25 business days).
- 21-day protest period after publication in the FMCSA Register.
- Insurer files BMC-91. After clearance, the MC number becomes active.
- BOC-3 process agent designation must also be on file.
For more detail on the full authority application process, see our how to get FMCSA authority guide.
Looking Up USDOT and MC Numbers
Both are searchable on the FMCSA SAFER system. You can search by:
- USDOT number
- MC number (with prefix)
- Company name
- Address
The carrier snapshot returned shows operating authority status, insurance filings, inspection and crash history, and other compliance data. SAFER is the standard reference used by brokers, shippers, and other carriers when verifying a motor carrier\'s status before working with them.
Maintaining Your Numbers
Once issued, both numbers stay with you indefinitely as long as you maintain compliance:
- Biennial MCS-150 updates. The FMCSA requires updates every 2 years to keep your USDOT number current. Filing late or skipping the update can put your USDOT in inactive status.
- Continuous insurance. The MC number stays active only as long as BMC-91 (and BMC-91X if applicable) is on file with active coverage. Lapses produce inactive status.
- UCR registration. Annual fee based on fleet size. Failure to pay can produce enforcement issues.
- Operations within authorized scope. If you change cargo types, operating radius, or other significant operational parameters, you may need to update your registration.