What a D-U-N-S® Number Is and How It Can Help You? 

The Dun & Bradstreet D-U-N-S® Number (short for Data Universal Numbering System) is a nine-digit unique identifier for businesses. Hundreds of millions of D-U-N-S® Numbers exist for companies across the globe.

A D-U-N-S® Number is assigned through our patented identity resolution process, (part of our DUNSRight™ data governance, which includes thousands of separate automated checks.) The D-U-N-S® Number identifies a company as being unique from any other in the Dun & Bradstreet Data Cloud. It is used as the starting point for any company's Live Business Identity, which helps ensure you have the most accurate and up-to-date view of organizations.

When Do I Need a D-U-N-S® Number? 

You are never required to have a D-U-N-S® Number to operate a business. The number itself contains no data or implies nothing about the stability, creditworthiness, or diversity of a business. However, it is a key that can be used to unlock data that helps a business do their due diligence and arrive at their own conclusion about that potential partner’s stability, creditworthiness or compliance with supplier diversity or other standards.

You may be asked to provide your company’s D-U-N-S® Number when:

  • Applying for a loan with a financial institution
  • Applying for credit with a business partner
  • Applying to become a vendor or supplier of a company
  • Bidding on contracts locally, or even internationally

In short, anytime you want to make sure that a potential partner, supplier or customer gets a complete and more accurate story about your business, making sure you have a D-U-N-S® Number and an up-to-date Live Business Identity is key.

Learn more about the D&B D-U-N-S® RegisteredTM Program >


As Hong Kong embraces a transformative shift towards a Unique Business Identifier (UBI) strategy, Dun & Bradstreet stands as a key partner in this evolution. Our globally recognized business identifier, the D-U-N-S® Number, has seamlessly mapped to both Company Registration Numbers (CR) and Business Registration Numbers (BRN) for Hong Kong companies.

By adopting the D-U-N-S® Number as part of the UBI strategy, businesses gain a powerful link to other globally accepted identifiers, including the Legal Entity Identifier (LEI). This integration not only streamlines business identification processes but also catapults Hong Kong companies onto the international stage, enhancing credibility and facilitating connections in the global marketplace. Our ready digital solution ensures that Hong Kong businesses can effortlessly navigate the UBI landscape, accessing their D-U-N-S® Number promptly to establish a robust global identity.



The D-U-N-S Number helps you:

  • Establish credibility and make sure other businesses get a complete and accurate story about your business
  • Eliminate duplicate file entries in your own customer and supplier information warehouses
  • Identify cross-selling opportunities within the same corporate family by and linking related customer accounts to support a 'one-customer' view
  • Reduce operating costs by linking interrelated suppliers and increasing purchasing power 
  • Act as a common identifier for invoices, requisitions, payments, and other business documentation to expedite applications for loans and contracts
  • Do business with governments and companies around the globe