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DDN may stand for:

  • Dayton Daily News, a daily newspaper in Dayton, Ohio
  • Digital Divide Network, a spinoff of
  • Defense Data Network, a separate instantiation of the ARPANET used by the U.S. Department of Defense from 1983-1995
  • Dehradun railway station, (station code: DDN)
  • Daydream Nation, an album by Sonic Youth
  • Digital Delivery Network, a service of the Community Radio Network in Australia
  • Dustin's Daily News, comedic current affairs TV show
  • Drink and Drugs News, a UK-based magazine for the substance misuse sector
  • DataDirect Networks, a provider of massively scalable data storage systems
  • Dot-decimal notation, a human readable way to write IPv4 internet addresses