DUNS number

DUNS (Data Universal Numbering System) assigns a persistent identifier to each business entity, and separately to each of its physical locations, which is exactly what makes it useful for deduplication. "Acme Industries," "ACME Ind. LLC," and "Acme Shanghai" might be one supplier, three related ones, or strangers; identifiers plus the corporate family tree built on them answer the question. That linkage view, branch to subsidiary to global parent, is also how buyers discover that three seemingly independent bidders share an owner.

Be clear about what the number does not tell you. It is an identifier, not a credential: holding a DUNS number says nothing about quality systems, capacity, or solvency. The value is in the data keyed to it (credit scores, payment behavior, firmographics), which feeds supplier qualification and ongoing supplier risk assessment. Treat those reports as one input, not a verdict, especially for small private suppliers where filings are thin.

In US federal contracting, DUNS was the registration key for decades until SAM.gov switched to the government-issued Unique Entity ID in April 2022, so federal suppliers now carry both identifiers. In practice, capture the identifier during supplier onboarding and store it in vendor master data so every system refers to the same legal entity.

Frequently asked questions

What is a DUNS number?

A DUNS number is a unique nine-digit identifier for a single business entity, issued by Dun & Bradstreet under the Data Universal Numbering System. Procurement teams use it to disambiguate suppliers in vendor master data, pull credit and firmographic reports, and map corporate family trees linking subsidiaries to parents.

What does a DUNS number tell you about a supplier?

A DUNS number by itself is an identifier rather than a credential: holding one says nothing about quality systems, capacity, or solvency. The value is in the data keyed to it, such as credit scores, payment behavior, and firmographics, which feed supplier qualification and ongoing risk assessment. Those reports should be treated as one input rather than a verdict, especially for small private suppliers where filings are thin.

How do DUNS numbers help with vendor master cleanup?

Because each legal entity and each of its physical locations carries its own persistent identifier, DUNS matching is a standard tool for deduplication. One manufacturer matched 28,000 vendor records against DUNS numbers and found they collapsed to 19,400 legal entities; a single supplier appearing under six names with three different payment terms recovered $40,000 a year in missed early-payment discounts after consolidation.

What is the corporate family tree built on DUNS numbers?

The corporate family tree links branches to subsidiaries to the global parent, and it answers questions a name match cannot. Buyers use it to discover that seemingly independent bidders share an owner; in one case two machine shops listed as dual sources for a safety-critical casting turned out to be subsidiaries of the same holding company, making the category effectively single-sourced.

Did the US government stop using DUNS numbers?

The US federal government used DUNS for contractor registration for decades until April 2022, when SAM.gov replaced it with the government-issued Unique Entity ID (UEI). Federal suppliers now carry both identifiers, while DUNS remains widely used in commercial procurement for supplier identification and credit reporting.