DUNS Definition
The Data Universal Numbering System. A proprietary nine-digit identifier owned and administered by Dun & Bradstreet, previously used as the master contractor ID for federal procurement.
Related Guides & Tools
- U.S. Federal Contracting Identifiers: DUNS, UEI, and CAGE Guide — A comprehensive reference detailing the required structural identifiers needed to transact with the U.S. federal government.
- The DUNS to UEI Transition: Key Information for Contractors — Explains the transition from the proprietary D&B DUNS identifier to the GSA-owned Unique Entity Identifier (UEI) on SAM.gov.
- LEI vs. DUNS vs. EIN: Understanding Corporate Identifiers — Compares global financial IDs (LEI) against commercial credit markers (DUNS) and IRS tax registrations (EIN).
- SIC ↔ NAICS Concordance Crosswalk — Search and map old SIC codes to modern formats.