DuckCorp Dico

Found one definition

1.                 From The Free On-line Dictionary of Computing (19 January 2023):
                   
   
   
                   
                     
   Value Added Network
   VAN
      <networking> (VAN) A privately owned network that provides a
      specific service, such as legal research or access to a
      specialised database, for a fee.  A Value Added Network
      usually offers some service or information that is not readily
      available on public networks.
      A Value Added Network's customers typically purchase leased
    lines that connect them to the network or they use a dial-up
    number, given by the network owner, to gain access to the
      network.
      (1998-11-10)