How-To: Clear DNS Resolver Cache · Monday February 18, 2008

On Windows 2000/XP/Vista, run this command from a DOS prompt:

ipconfig /flushdns

On Mac OS X 10.1 – 10.4 open /Applications/Utilities/Terminal.app and execute this command:

sudo lookupd -flushcache

On Mac OS X “Leopard” 10.5+ open /Applications/Utilities/Terminal.app and execute this command:

sudo dscacheutil -flushcache

Reboot your computer, and your operating system’s DNS cache should be cleared.

— Ryan J. Bonnell

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