The Dun & Bradstreet Corporation is a company that provides commercial data, analytics, and insights for businesses.
To uniquely identify a business, they introduced an identifier called D.U.N.S.-Number - sometimes also referred as "DUNS number" or "D-U-N-S", which abbreviates Data Universal Numbering System.
Scope allows to maintain the D.U.N.S. number of a business partner and also support a API to search for the D.U.N.S. number, see Dun & Bradstreet - Partner verification integration for details.
Manual public free search for the DUNS-number is also available via https://www.bisnode.de/upik/