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How to Flush DNS on Mac OS X

Last Updated: Sep 30, 2015 03:15PM EDT

Mac OS X 10.10 (Yosemite)

  • Open Terminal: Open Finder, go to Applications, scroll down to Utilities, and double click Terminal.
  • In Terminal, type "sudo discoveryutil udnsflushcaches" without the quotes, and hit enter.
  • If you are asked for your password, type it in, and click enter again.

Mac OS X 10.9 (Mavericks)

  • Open Terminal: Open Finder, go to Applications, scroll down to Utilities, and double click Terminal.
  • In Terminal, type "dscacheutil -flushcache;sudo killall -HUP mDNSResponder" without the quotes, and hit enter.
  • If you are asked for your password, type it in, and click enter again.

Mac OS X 10.7 (Lion) and 10.8 (Mountain Lion)

  • Open Terminal: Open Finder, go to Applications, scroll down to Utilities, and double click Terminal.
  • In Terminal, type "sudo killall -HUP mDNSResponder" without the quotes, and hit enter.
  • If you are asked for your password, type it in, and click enter again.

Mac OS X 10.5 (Leopard) and 10.6 (Snow Leopard)

  • Open Terminal: Open Finder, go to Applications, scroll down to Utilities, and double click Terminal.
  • In Terminal, type "dscacheutil -flushcache" without the quotes, and hit enter.
  • If you are asked for your password, type it in, and click enter again.

Mac OS X 10.4 (Tiger)

  • Open Terminal: Open Finder, go to Applications, scroll down to Utilities, and double click Terminal.
  • In Terminal, type "lookupd -flushcache" without the quotes, and hit enter.
  • If you are asked for your password, type it in, and click enter again.

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