December 19th, 2009
When you visit any website or host on your computer, the DNS reference/IP address gets cached for quite some time. This can be a pain if you are migrating domains, or changing webhosts and need to test to see that your new changes are being propagated/used correctly.
In order to flush the DNS cache in Mac OS X, type the following command into a Terminal window:
dscacheutil -flushcache
This command works on Mac OS X 10.5 and above (including 10.6/Snow Leopard).
The command in Mac OS X 10.4 is:
lookupd -flushcache
Tags: cache, dns, flush, mac, osx
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