A DUNS number (Data Universal Numbering System) is a unique nine-digit identifier assigned to your business by Dun and Bradstreet. Federal contracting requires a DUNS number. SAM.gov registration requires a DUNS number. SBA loan applications require a DUNS number. Understanding what a DUNS number is, why you need it, and how to obtain it is foundational to federal contracting.

What is a DUNS Number?

A DUNS number is a unique identifier that Dun and Bradstreet assigns to individual business locations. If you have multiple business locations or subsidiaries, each location receives its own DUNS number. This allows the federal government and creditors to track and monitor business activities at each location separately.

Dun and Bradstreet maintains a global database of business information including company name, address, ownership, payment history, and other data. Your DUNS number is the key that links your business to your record in the Dun and Bradstreet database.

Why Federal Contracting Requires a DUNS Number

Federal contracting regulations require that all businesses bidding on federal contracts have a DUNS number. The federal government uses DUNS numbers to verify business information, check for fraud, and link your business to your SAM.gov registration and certifications.

When a federal contracting officer receives your proposal, they verify your DUNS number in SAM.gov. This verification links your proposal to your registered business information and certifications. If your DUNS number is not correct or if your DUNS information is inaccurate, your proposal may be rejected.

How to Obtain a DUNS Number

Obtaining a DUNS number is free and straightforward. Visit dnb.com and select the option to register for a DUNS number. You can also call Dun and Bradstreet at 1-866-705-5711 to register by phone.

To register for a DUNS number, you need to provide your business name, business address, business structure (sole proprietorship, LLC, corporation, etc.), and contact information. If your business has been operating for at least three months, Dun and Bradstreet will issue a DUNS number immediately.

If your business is brand new (less than three months old), Dun and Bradstreet may require additional documentation before issuing a DUNS number. Provide your business registration, articles of incorporation, or other documentation showing that your business is legally established.

DUNS Number Registration Timeline

DUNS number registration typically takes a few days to a week. Once you apply, Dun and Bradstreet will verify your information and issue your DUNS number. They will email your DUNS number to you along with instructions for accessing your Dun and Bradstreet business profile.

For federal contracting, obtain your DUNS number before registering in SAM.gov. You will need your DUNS number to complete SAM.gov registration.

Maintaining Your DUNS Information

Once you receive your DUNS number, ensure that the information associated with it remains accurate. If you move your business, change your business name, or make other material changes, update your DUNS information with Dun and Bradstreet.

You can update your DUNS information online at dnb.com or by calling Dun and Bradstreet. Regular updates prevent discrepancies between your DUNS information and your SAM.gov registration.

DUNS Number and SAM.gov

Your DUNS number links your SAM.gov registration to your Dun and Bradstreet business record. When you register in SAM.gov, you provide your DUNS number. SAM.gov verifies that your DUNS number is valid and that your business information matches your DUNS record.

If there are discrepancies between your SAM.gov information and your DUNS information, update both databases until they match. This alignment is critical for federal contracting success.

DUNS Number and SDVOSB Certification

When you apply for SDVOSB certification, the SBA may verify your information through your DUNS number. If your DUNS information is inaccurate or outdated, this can create problems with your SDVOSB application.

Before applying for SDVOSB certification, verify that your DUNS information is accurate and current. This prevents delays in your certification process.

DUNS Number and Business Credit

Beyond federal contracting, your DUNS number is important for business credit. Dun and Bradstreet maintains credit history information on your business. Lenders and suppliers use your DUNS number to assess your business creditworthiness.

Paying your business obligations on time and maintaining accurate business information improves your business credit profile. Better business credit helps you access loans and favorable payment terms from suppliers.

Common DUNS Number Issues

Many federal contractors face issues related to DUNS numbers. Understanding common issues helps you avoid them.

First, providing an incorrect DUNS number in SAM.gov prevents verification of your business. If you enter the wrong number, federal contracting officers cannot verify your information. This creates problems with your proposals.

Second, having multiple DUNS numbers for the same business creates confusion. If you have registered your business multiple times or your business has been registered by multiple people, you may have multiple DUNS numbers. Consolidate your DUNS numbers so you have only one primary DUNS number for your business.

Third, allowing your DUNS information to become outdated creates discrepancies with SAM.gov. If you move your office and do not update your DUNS information, your business address will differ between DUNS and SAM.gov. Federal contracting officers may become confused or reject your proposals.

Verifying Your DUNS Number

To verify your DUNS number, log into your Dun and Bradstreet account at dnb.com. Your account shows your DUNS number and associated business information. Review the information for accuracy.

You can also call Dun and Bradstreet to verify your DUNS number and business information.

DUNS Number for Procurement

Once you have your DUNS number, you are ready to register in SAM.gov and begin federal contracting. Your DUNS number is a critical piece of your federal contracting foundation.

Invest time in obtaining your DUNS number early in your federal contracting journey. Maintain accurate DUNS information throughout your federal contracting career. This administrative foundation prevents problems and supports successful federal contracting.