• The Universal Data Numbering System (DUNS) number is a unique nine-digit numeric identifier that is assigned to a single business entity.

  • Dun & Bradstreet created DUNS in 1963 to identify businesses as part of their credit reporting system.
  • DUNS numbers are free for US companies.
  • While obtaining a DUNS number is voluntary, it is mandatory to apply for government contracts and often to conduct business abroad.