DUNS number
A DUNS number identifies a single business entity with a unique nine-digit code issued by Dun & Bradstreet. 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. The US federal government used DUNS for contractor registration until April 2022, when SAM.gov replaced it with the Unique Entity ID (UEI).
Examples
Vendor master cleanup: A manufacturer matches 28,000 vendor records against DUNS numbers and finds they collapse to 19,400 legal entities. One supplier appears under six names with three different payment terms; consolidation alone recovers $40,000 a year in missed early-payment discounts.
Hidden single source: A buyer lists two machine shops as dual sources for a safety-critical casting. The corporate family tree shows both are subsidiaries of the same holding company, so a parent-level insolvency would take out both sources at once. The category gets re-flagged as effectively single-sourced.
Definition
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.
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