The Data Universal Numbering System (abbreviated as DUNS or D-U-N-S) is a system developed and regulated by Dun & Bradstreet (D&B) that assigns a unique numeric identifier, referred to as a DUNS number, to a single business entity. It was introduced in 1963 to support D&B's credit reporting practice. It is a common standard worldwide. DUNS users include the European Commission, the United Nations and the U.S. government. More than 50 global, industry, and trade associations recognize, recommend, or require DUNS. The DUNS database contains over 100 million entries for businesses throughout the world.