The Data Universal Numbering System, abbreviated as DUNS or D-U-N-S is a system developed and regulated by Dun & Bradstreet (D&B) which assigns a unique numeric identifier to a single business entity. This numeric identifier is then referred to as a DUNS number. It was introduced in 1963 to support D&B's credit reporting practice. It has gained wide acceptance globally and is a common standard. Its users include the European Commission, the United Nations and the United States government. It is recognized, recommended and/or required by more than 50 global, industry and trade associations. The DUNS database has over 57 million entries for businesses throughout the world.
Source(s):
http://en.wikipedia.org/wiki/DUNS_NUMBER

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Dun stands for "data universal numbering system," Dun and Bradstreet (D&B) is a company that provides business information for credit, marketing, and purchasing decisions. D&B issues unique 9-digit numbers that get used by businesses and the federal government to track more than 70 million businesses world-wide. The easiest way to get one is to call Call D&B's 1-866-705-5711 or apply online at https://eupdate.dnb.com/requestoptions.html
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