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by kalleboo 4216 days ago
http://en.wikipedia.org/wiki/IPv6#Privacy

  When privacy extensions are enabled, the operating system 
  generates random host identifiers to combine with the 
  assigned network prefix


  Privacy extensions are enabled by default in Windows 
  (since XP SP1), OS X (since 10.7), and iOS (since version 
  4.3).[32][33] Some Linux distributions have enabled 
  privacy extensions as well.[34]