How to Flush DNS Cache

Instructions for flushing your DNS cache in various operating systems.

Microsoft Windows

To flush your DNS cache within Windows, open a command prompt and run the following command:

ipconfig /flushdns

Linux

To flush DNS cache within Linux, you can restart the ncsd daemon, which could be done in any of the following ways. (It depends on your specific Linux distribution.)

sudo /etc/init.d/nscd reload
sudo /etc/rc.d/init.d/nscd reload
sudo service nscd reload

If you don’t have nscd installed, you can install it by doing one of the following:

apt-get install nscd
yum install nscd

If you’re using Bind, you can flush the daemon’s cache by doing:

sudo rndc flush

Mac OSX

You can flush your DNS cache by using either the lookupd or the dscacheutil command, depending on your version of OSX:

lookupd -flushcache     ; Leopard
dscacheutil -flushcache    ; Snow Lepoard and Lion

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