Updated July 15, 2026

A DOT number is a unique identifier issued by the Federal Motor Carrier Safety Administration (FMCSA) to track a trucking company’s safety records, inspections, and compliance information. Before a trucking company can legally operate in interstate commerce, the DOT number must show as active in the FMCSA SAFER system.

If you recently applied for trucking authority, checking your DOT number status is one of the most important steps before hauling loads. In this guide, you’ll learn what a DOT number is, how to check if your DOT number is active, common reasons a DOT number may show inactive, and what trucking companies should do after their authority becomes active.

Quick Answer: What Is a DOT Number?

A DOT number is a unique identification number assigned by the FMCSA to commercial trucking companies operating in interstate commerce. Trucking companies can check whether a DOT number is active by using the FMCSA SAFER website. An active DOT number is required before legally hauling freight across state lines.

What Is a DOT Number?

A DOT number, also called a USDOT number, is used by the FMCSA to monitor trucking company safety records, inspections, crash reports, audits, and compliance activity.

Most trucking companies operating commercial vehicles in interstate commerce are required to have an active DOT number before hauling freight legally.

A DOT number helps the FMCSA track:

  • Safety ratings
  • Inspection history
  • Insurance filings
  • Compliance reviews
  • Crash investigations
  • Operating status

New trucking companies often apply for both a DOT number and MC number during the authority application process.

How to Check if Your DOT Number Is Active

Need to do a quick DOT number lookup or DOT number search? Here’s how to check your status directly on the FMCSA SAFER system:

  1. Visit the FMCSA SAFER website
  2. Enter your DOT number or company name
  3. Review your operating status
  4. Confirm your DOT number shows as “Active”
Commercial semi truck on highway illustrating how to check if a DOT number is active using FMCSA for trucking compliance

If your DOT number shows inactive, pending, or out of service, your trucking company may not legally operate until the issue is resolved.

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What Is an Inactive DOT Number?

All commercial fleets involved in interstate commerce and responsible for transporting passengers or hauling cargo with weight ratings of 10,001 pounds or more must receive a DOT number. Many states also require numbers for intrastate commerce. These numbers are generally posted on the truck cabin and the driver’s side door for easy identification.

These numbers are eight-digit identifiers used by government officials when looking at safety information during audits, reviews, inspections and accident investigations. The FMCSA created them as an attempt to lower the frequency of serious road incidents caused by improperly trained drivers. Companies failing to comply with federal and state regulations are often subject to hefty fines and penalties. Infringing upon restrictions may also result in the FMCSA deeming your DOT inactive, revoking your ability to legally transport goods and people.

What Does an Active DOT Number Mean?

An active DOT number means the FMCSA recognizes your trucking company as authorized to operate under current federal regulations. However, having an active DOT number does not always mean your MC authority is active yet.

Many new trucking companies confuse DOT activation with operating authority approval. In most cases, trucking companies also need active operating authority and insurance filings before hauling interstate freight.

Reasons Why Your DOT Number Is Inactive

Your U.S. DOT number can become inactive for several reasons, including changing ownership, failing to submit a new entry audit or missing payments on your International Fuel Tax Association (IFTA) taxes.

Your DOT number may show inactive for several reasons:

  • Insurance filings have not been completed
  • Your authority is still pending
  • The FMCSA application process is incomplete
  • A required BOC-3 filing is missing
  • Your company has been marked out of service
  • Your authority has been revoked or deactivated

Many DOT number delays happen during the first few weeks after applying for authority.

1. Failure to File Biennial Paperwork

One of the most common reasons DOT numbers are given an inactive status is a failure to complete the mandatory biennial paperwork. Failure to submit an update before the deadline will deactivate your U.S. DOT number and incur fines of up to $1,000 a day. The FMCSA requires motor carriers to update their business information every two years or sooner if changes occur.

The MCS-150 form is the most common document companies must fill out. The second to the last digit of your DOT number determines whether you must file on an even or odd year, while the last digit denotes which month you must submit by. This form collects information like your fleet’s mileage, the number of vehicles and whether you carry passengers or hazardous materials.

This information is used to create safety performance scores, making filing accurately and on time critical.

2. Lapse in Trucking Insurance

All trucking companies need motor carrier insurance on file with the FMCSA to operate legally. They won’t provide your company with a DOT number without insurance and will deactivate your number if you lapse on your insurance payments. The type of insurance the FMCSA requires your fleet to have depends on what you haul.

Motor carriers transporting hazardous goods should have a minimum of $750,000 in liability coverage on cargo, which stretches up to $5,000,000 in coverage for hazardous materials and passengers. However, household goods trucking companies need $5,000 in cargo coverage per vehicle and $10,000 per occurrence. The right insurance policy will ensure your DOT number remains in good standing.

3. Failed Safety Audit

Within the first 12 months of operation, all trucking companies undergo a safety audit as part of the new entrant program. These reviews look at various safety controls, including:

  • Driver qualifications
  • Hours of service records
  • Vehicle maintenance procedures
  • Vehicle inspection history
  • Driver medical information
  • Alcohol and controlled substance testing programs
  • Accident reporting
  • Insurance coverage

If you fail your safety audit, you will receive a written explanation of why you didn’t pass and what you must do to correct it. You will then have 45 days to create and submit a corrective action plan (CAP).

If you miss the deadline or neglect to formulate a CAP, the FMCSA will revoke your registration and place your DOT number as out of service. Depending on the offense, certain violations will result in expensive fines ranging from $250 to almost $80,000.

4. Paused Operations

A DOT number can be deemed out of service if your company files an out-of-business or paused transportation update. When a trucking business writes “out of business” on form MCS-150, deactivation is considered voluntary. Completing the MCS-150 document in this way lets the FMCSA know that fleet vehicles will be off the road for the foreseeable future.

Documenting that your company is out of business with the FMCSA is a proactive way to maintain a positive reputation. Depending on how long your brand is out of business, it is possible to reactivate and obtain the same DOT number for a vehicle.

Steps to Reactivate a DOT Number

Reactivating your DOT number is straightforward, provided you follow the steps and rules below.

Check to See if Your DOT Number Is Active

The first step to getting your trucks back on the road is learning how to check if a DOT number is active. You can use the Company Snapshot feature on the SAFER system to do this. With your number and company name, you can use this platform to confirm your status in minutes, free of charge. You can also learn more about your DOT number activity by emailing the FMCSA or calling their customer service team at (800) 832-5660.

It’s crucial to check your status, even if you know your number is out of service. It will provide you with important information to start taking steps to reactivate it.

Gather the Correct Information

The information you’ll need to reinstate your DOT number will depend on the causes of the deactivation. Checking your status using SAFER will provide you with a classification, commonly either “Record Inactive” or “Inactive USDOT Number per 49 CFR 390.19(b)(4).” These conditions require you to resubmit your MCS-150 form or a MCS-150B if you carry hazardous materials.

However, different situations require you to submit different forms and follow various steps. For example, if you’re reinstating your DOT number after having your new entrant application revoked, you’ll have to follow a different plan of action compared to failing to update your biennial information. The FMCSA regularly updates its forms and provides all the documentation you’ll need on its website.

Regardless of which forms you need, you can expect to use the following information:

  • Motor Carrier number
  • Legal name of the carrier
  • Billing address when using credit card
  • Phone number
  • Signature
  • Email
  • Check or money order with the person’s or company’s name

Reactivate Your Number

After confirming your inactive DOT number and collecting everything you need, you’re ready to start the formal reactivation process. The first thing you should do is correct the issue or violation. Whether you forgot to update your biennial information or didn’t have proper maintenance procedures, you should remedy those problems first.

With that complete, you can finish the designated forms and send them to the FMCSA. They prefer online submissions using their web form or fax machine. However, they do accept hard-copy registrations through the mail. If you need help during the process, you can work with a DOT professional to ensure you’re on the right track.

How Long Does a DOT Number Stay Active?

Your commercial DOT number will remain active for as long as you comply with FMCSA regulations and keep your brand in good standing.

Continuing to file the MCS-150 form by the deadline every one to two years is one of the most important actions you can take to operate in the industry without complications.

Stay up to Date With Your DOT Number Status

Your DOT number plays a crucial role in your daily operations. Whether you haul hazardous materials or not, complying with FMCSA regulations ensures you and your employees are safe and secure while transporting goods across state lines. Part of following their restrictions entails regularly checking in with your DOT number status to ensure you’re ready to tackle any job that comes your way.

With our informative articles and resources, you can keep an eye on the Porter Freight Funding blog to stay in the know about everything trucking and fleet management. From compliance to insurance services, we can help your company stay within regulations — reach out today.

DOT Number vs MC Number

Many new trucking companies assume a DOT number and MC number are the same thing, but they serve different purposes. A DOT number primarily tracks safety and compliance, while an MC number grants authority to transport freight for hire across state lines.

DOT Number

MC Number

Tracks safety/compliance

Grants operating authority

Issued by FMCSA

Issued by FMCSA

Required for many carriers

Required for interstate for-hire carriers

Used for inspections/audits

Used for hauling regulated freight

Ready to Start Hauling?

Once your DOT number and authority become active, having the right financial tools can help new trucking companies operate more efficiently.

Porter Freight Funding helps new authorities with:

Frequently Asked Questions About Checking a DOT Number

Checking whether a DOT number is active helps carriers, brokers, and shippers verify authority, reduce fraud risk, and stay compliant. These common questions explain how DOT number status works and why it matters in trucking.

How do I check if a DOT number is active?

To check if a USDOT number is active, visit the FMCSA SAFER website and search using the DOT number or company name. The system will show the carrier’s status as Active, Inactive, or Out of Service. An active status means the trucking company is authorized to operate.

How do I do a DOT number lookup or DOT number search?

A DOT number lookup (also called a DOT number search) means searching the FMCSA SAFER database by DOT number, MC number, or company name to confirm a carrier’s status. You can complete a DOT number lookup for free in under a minute by visiting the SAFER website and entering the requested information.

An active DOT number means the trucking company is currently authorized by the Federal Motor Carrier Safety Administration to operate. It indicates the carrier is compliant with registration requirements and can legally transport freight.

An inactive DOT number means the carrier is not currently authorized to operate. This may happen because the company failed to complete required updates, has insurance issues, or voluntarily stopped operating. Brokers and shippers typically will not work with inactive carriers.

A DOT number may become active within 24 to 48 hours after registration, but full operating authority can take longer depending on insurance filings and FMCSA processing. Carriers must meet all requirements before hauling freight legally.

No. Operating with an inactive DOT number is illegal and can result in fines, penalties, or being placed out of service. Carriers need an active DOT number and valid authority before hauling freight.

You should verify a DOT number before working with a new carrier or broker and periodically during ongoing business relationships. Regular checks help reduce compliance risk and confirm that the company is still authorized to operate.

No. A DOT number identifies a carrier and tracks safety records, while MC authority gives permission to haul freight for hire. Depending on the type of operation, a trucking company may need both.

A DOT number may become inactive because of a missed biennial update, missing insurance filings, or unresolved compliance issues. Keeping FMCSA records current is important for maintaining active status.

To reactivate an inactive DOT number, a carrier generally needs to submit an updated MCS-150 form, confirm insurance filings are in place, and resolve any FMCSA compliance issues. Once the requirements are met, the status can return to active.

Brokers check DOT numbers to confirm that a carrier is legally authorized, properly registered, and compliant. This helps reduce fraud, avoid liability, and ensure loads are assigned to legitimate trucking companies.

Yes. Freight factoring companies may review broker and carrier information, including DOT status, as part of credit review and risk management. This can help carriers avoid issues and make more informed business decisions.

If a DOT number is marked Out of Service, the carrier is prohibited from operating because of safety violations or compliance problems. Operating under this status can lead to serious penalties and enforcement action.

Most owner-operators need a USDOT number if they operate commercial vehicles in interstate commerce or haul regulated commodities. Requirements can vary based on operation type and state rules.

You can check a broker’s authority and related records using the FMCSA SAFER system and the Licensing and Insurance database. These resources show authority status, insurance information, and business details.

DOT number verification helps trucking companies reduce fraud, protect compliance, and confirm they are working with legitimate carriers or brokers. It is an important step before accepting, assigning, or hauling a load.