What Is a DUNS Number? (2026 Guide)

Quick Answer: A DUNS number is a free, nine-digit ID that Dun & Bradstreet — the world’s oldest business-credit bureau — assigns to each business location. It’s the key that opens your business credit file: vendors, lenders, and corporate buyers use it to verify your company and pull its credit history. It costs $0, never expires, and over 600 million businesses worldwide have one.

The Plain-English Definition

DUNS stands for Data Universal Numbering System. Dun & Bradstreet created it in 1963 as a numbering scheme for its company database, and it became the closest thing the business world has to a universal company ID — like a social security number for a business, but run by a private company, not the government.

Three things make it unusual:

• It’s free. D&B has never charged for the number itself. What actually costs money
• It never expires. D&B issues it once. It doesn’t change when you move, rebrand, or sell the business.
• It’s location-specific. Each physical location gets its own number. Two offices = two DUNS numbers.

What It Looks Like

Nine digits, numbers only, often written with hyphens as D‑U‑N‑S (that’s D&B’s official styling). It contains no encoded information — the digits don’t mean anything by themselves; they just point to your company’s file in D&B’s database.

You’ll see it printed on supplier registrations, corporate onboarding forms, and D&B’s D-U-N-S Registered seal that some companies display on their websites.

What a DUNS Number Is Used For

1. Your business credit file. This is the big one. Your D&B credit file — payment history, trade references, and your PAYDEX score — lives behind your DUNS number. Lenders and suppliers who “pull your business credit” are pulling this file. What a PAYDEX score is
2. Corporate supplier onboarding. Most large procurement systems (big-box retailers, manufacturers, global brands) require a DUNS number before you can sell to them.
3. Apple Developer & Google Play organization accounts. Both app stores require a DUNS matching your legal entity for organization accounts.
4. FDA food facility registration and some regulated-industry filings.
5. Some state and local contracts — and, historically, all US federal contracts (more on that below).

What a DUNS Number Is NOT

Being precise here saves you real confusion later:

• Not a license or permit. It doesn’t authorize you to do anything — it identifies you.
• Not required by law. No statute forces you to have one. Private requirements (buyers, app stores) are what make it necessary in practice.
• Not a credit score. It’s the file number; your PAYDEX score is what’s inside the file.
• Not proof of good credit. Having one just means your file exists.
• Not a tax ID. That’s the IRS’s EIN. DUNS vs EIN vs UEI compared

Since 2022: The Federal Government Doesn’t Use It Anymore

The most outdated “fact” on the internet about DUNS numbers: that you need one for US federal contracts and grants. That stopped on April 4, 2022, when SAM.gov switched to its own free identifier, the UEI (Unique Entity ID, 12 characters).

So: federal awards → UEI. Everything else on the list above → still DUNS. The full “do you still need one” breakdown

You Might Already Have One

D&B builds its database from public records — business registrations, credit filings, trade data. If your company is a few years old and has any commercial footprint, there’s a decent chance a file already exists with your name on it. Check for free: how to look up a DUNS number

If you have no file, you create one by applying. It’s a free, 10-minute form, and the number arrives within about 30 business days. Full step-by-step application walkthrough

The File Behind the Number (Why People Care)

A DUNS number by itself is a file number. What makes it valuable is what grows inside the file:

• PAYDEX score — D&B’s payment-behavior score, where 80 means “pays on terms.” PAYDEX explained
• Trade references — vendors reporting that you pay on time. How to get trade references reported
• Alerts — D&B’s free CreditSignal tool shows you your score and pings you when your file changes. CreditSignal

Vendors deciding whether to give you net-30 terms, and lenders deciding whether your business is creditworthy, look at this file. That’s the entire reason to have a DUNS number — not the digits, the data behind them.

Want ongoing monitoring and full reports? D&B Credit Insights starts at $49/month.

FAQ — Real Questions, Short Answers

What does DUNS stand for?
Data Universal Numbering System — created by Dun & Bradstreet in 1963 as the numbering scheme for its business database.

Is a DUNS number free?
Yes — $0, no card, no trial. The only paid option is the $229 DUNSFile expedited service (8 business days instead of ~30). Full cost breakdown

Is a DUNS number the same as an EIN?
No. The IRS issues your EIN for taxes. D&B issues your DUNS for business credit and verification. Most businesses end up with both — plus a UEI if they do federal work. Side-by-side comparison

Do I legally need a DUNS number?
No law requires one. But corporate buyers, both major app stores (for organization accounts), and some contracts require it — which makes it necessary in practice for many businesses.

How many DUNS numbers does a company have?
One per physical location. A company with three offices has three DUNS numbers, each with its own credit identity.

Does a DUNS number expire or change?
No. It’s issued once and stays with the business for life — even through moves, rebrands, and ownership changes.

How do I find out if my company already has one?
Search yourself in D&B’s free lookup tool — it takes a minute and needs no account. Free lookup walkthrough

Can non-US companies get a DUNS number?
Yes. D&B issues them in 190+ countries through regional sites (dnb.co.in for India, for example). The format is identical worldwide. India walkthrough

The Bottom Line

A DUNS number is your company’s ID in the world’s business database. It’s free, it’s permanent, and the real value isn’t the number — it’s the credit file that grows behind it. If you’ll ever sell to a big buyer, publish an app under a company account, or build business credit, get one now: it takes 10 minutes and costs nothing. How to get yours free

Update log: November 2026 — published. Free status, 600M figure, and 1963 origin verified on dnb.com.