DUNS Number: What Exactly Is It?

You've heard about the DUNS number but aren't quite sure what it is? You're not alone. Yet this small 9-digit number has become one of the most important identifiers in the business world. Here's a clear, jargon-free explanation to help you understand everything in just a few minutes.

The Official Definition of the DUNS Number

DUNS stands for Data Universal Numbering System. It is a unique numerical identification system created by Dun & Bradstreet (D&B) in 1962. It assigns every business a 9-digit number that serves as its universal identifier in international commercial dealings.

Despite what the name might suggest, the DUNS number is not a random serial number. It is assigned sequentially by D&B after verifying the legal existence of the business. Once assigned, this number never changes — even if the company changes its name, address, or management.

Today, more than 455 million businesses worldwide have a DUNS number. It is recognized in 224 countries and used as an identification standard by organizations as significant as the European Union, the United Nations, Apple, Google, and dozens of national governments.

A Simple Analogy: Your Company's International Passport

The best way to understand the DUNS number is to compare it to a passport. Your personal passport identifies you uniquely anywhere in the world, regardless of your nationality or place of residence. The DUNS number does exactly the same thing for your company.

Imagine you're looking for a business partner in Japan. Your Japanese counterpart wants to make sure they're dealing with a legally existing and reliable company. They ask for your DUNS number. Within seconds, they can verify your legal existence, address, industry sector — and if you've subscribed to D&B's premium services — your credit score and payment history.

Without this passport, your company is invisible to many international organizations. With it, you exist verifiably within a network of 455 million companies worldwide.

DUNS vs National Identifiers: Understanding the Differences

Every country has its own business identification system. In the UK it's the Companies House number, in Germany the Handelsregisternummer, in the US the EIN. The DUNS number is different: where national identifiers serve domestic administrative purposes, the DUNS is a global identifier recognized worldwide.

National identifiers are automatically assigned when a company registers in its home country. They serve domestic administrative purposes: tax filings, employment contracts, local compliance. The DUNS must be obtained separately and is designed specifically for international business relationships.

Who Assigns the DUNS Number?

The DUNS number is assigned exclusively by Dun & Bradstreet, an American company founded in 1841 that is now one of the world's most important commercial databases. D&B maintains a database of more than 455 million companies, continuously updated through numerous sources: official registries, government data, financial information, and data provided directly by companies themselves.

D&B works with local partners in various countries to ensure data accuracy. These partners help collect and verify local business information, making the global database more reliable and comprehensive.

Why Does the DUNS Number Exist?

The problem the DUNS addresses is fundamental: how to reliably identify a business among hundreds of millions, across all the countries of the world, with different legal and administrative systems?

Before the DUNS, companies had to use local identifiers (like the company registration number in the UK, the SIRET in France, etc.) that were not comparable across countries. An American company couldn't easily verify the legal existence of a British supplier using its domestic registration number alone.

The DUNS solves this problem by creating a universal identifier: regardless of the company's country of origin, its DUNS number allows it to be identified and found in D&B's global database.

Concrete Examples of DUNS Usage

How to Get Your DUNS Number

The good news: getting your DUNS number is straightforward. The caveat: it can take time if you go through the official free method (up to 30 days). With DUNS Verify, you get your certified number in under 2 minutes for €4.99.

To learn about all available methods, check out our complete guide: the complete DUNS number guide.