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There is a simple command for every operating system for quickly cleaning the DNS cache. On Linux and Mac, the command must be typed in a terminal. In Windows, type the command in cmd.exe (Start > Run, type cmd.exe):

Linux:

Firstly, make sure you have nscd installed:
sudo apt-get install nscd
Then:
sudo /etc/init.d/nscd restart


Mac OS X:
lookupd -flushcache

Leopard and later:
dscacheutil -flushcache


Windows:
ipconfig /flushdns

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