A DUNS number is a 9-digit identifier assigned by Dun & Bradstreet that creates your business's file in their database. Every business that has ever applied for a significant loan, a government contract, or a trade account with a major supplier has one.
If your business doesn't have one, lenders can't verify that your business has a credit identity. That matters more than most business owners realize.
What DUNS actually does
When a lender queries your business, one of their first checks is the D&B database. They are looking for your Paydex score — D&B's measure of how reliably your business pays its obligations.
No DUNS number means no file. No file means no Paydex score. No Paydex score means the lender has no way to verify your business's payment history, regardless of how long you've been operating.
This is not a disqualifier on its own. But it is a gap that adds risk to your profile in the lender's analysis.
How to get a DUNS number
Registration is free at dnb.com. The process takes about 15 minutes. You'll need:
- Your legal business name (exactly as registered with your state)
- Your business address (commercial or registered agent — not home, not P.O. box)
- Your EIN
- Year the business started
- Number of employees
After registration, allow 30 days for your file to initialize and become searchable.
What to do after registration
Getting a DUNS number is the starting point, not the destination. Once your file exists, you need to populate it with payment history.
Open 2–3 net-30 vendor accounts with companies that report to D&B: Uline, Quill, and Grainger are the most consistent. Make purchases. Pay early. Within 60–90 days, your Paydex score will begin generating.
A critical detail
The business information on your DUNS file must match your entity registration, your bank account profile, and your EIN exactly. Different addresses, different business name spellings, or missing information create inconsistencies that lenders flag.
Before applying for funding, verify that your D&B profile shows the correct information. Update it if anything is wrong.
Who requires a DUNS number
Any lender doing formal underwriting will check D&B. Federal government contractors are required to have one — it was the standard until replaced by the SAM UEI in 2022, and D&B still underlies much of the business credit ecosystem. Suppliers extending net-30 credit check it routinely.
If you're building toward business funding, you need a DUNS number now — not when you're ready to apply.
Oliver | Legendary Pathway — legendarypathway.com