A D-U-N-S Number (Data Universal Numbering System) is a unique nine-digit identifier issued by Dun & Bradstreet to identify a business as a distinct legal entity. It is the anchor of your entire D&B business credit file — vendors, lenders, and government agencies all use it to look up and match your business. Without one, nothing can report your payment history to D&B, and no PAYDEX score can ever be generated.
What a D-U-N-S Number Is Used For
- D&B business credit file identity — the number your PAYDEX score and all D&B tradelines attach to.
- Vendor and supplier applications — many net-30 vendors require it before extending credit terms that report.
- Government contracting — federal contracts historically required a D-U-N-S Number (the government has been transitioning to its own Unique Entity ID, but many systems still reference D-U-N-S).
- Grant applications — many private and public grant programs require it as a business identity verification step.
How to Get One — Free vs. Expedited
| Method | Cost | Timeline | Best For |
|---|---|---|---|
| Standard application | Free | Up to 30 business days | Anyone with time to plan ahead — apply in Week 1 of starting your credit-building process |
| Expedited application | $229 | 1-5 business days | When you need to open vendor accounts or apply for something immediately |
How to Apply
- Go to dnb.com and search whether your business already has a D-U-N-S Number — some businesses are automatically assigned one if they have ever appeared in D&B's database through a prior credit application or public record.
- If none exists, complete the free application with your exact legal business name, address, and phone number — matching your state filing and EIN exactly.
- Wait for confirmation — up to 30 days for the free tier. D&B will verify your business information during this period.
- Once issued, log in and claim your file at dnb.com. Verify every field matches your other business records exactly.
Common Reasons for Delay or Rejection
- Address mismatch. If your business address does not match public records (Secretary of State filing, IRS records), verification can be delayed.
- Residential address. A home address can trigger additional verification steps — a commercial address processes more smoothly.
- New entity with no public footprint. A business with no other public records yet may take the full 30 days as D&B builds out the initial file from scratch.
This is Step 2 of the full guide. See the Build Business Credit guide for the complete sequence — legal foundation, bureau registration, vendor accounts, and beyond.
