The Data Universal Numbering System (DUNS) was the longstanding unique identifier for organizations in federal procurement.
As of 2022, DUNS has been replaced by the government-issued UEI managed in SAM.gov. While many historical records and past
performance references still include DUNS numbers, new awards and registrations require the UEI. Companies should ensure that
legacy references map correctly to current UEI records to avoid confusion in responsibility checks and past performance lookups.
- Procurement & RFP Basics
DUNS (Legacy)
Legacy Dun & Bradstreet identifier historically used for federal procurement; replaced by UEI.
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Related Glossary Terms
Legacy Dun & Bradstreet identifier historically used for federal procurement; replaced by UEI.
Government-wide identifier that replaced DUNS for entity identification in federal awards.
Mandatory vendor registration in the federal System for Award Management with a Unique Entity Identifier.
Official government system capturing past performance ratings on federal contracts.