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How to Flush DNS cache in Mac OS X?

What is the Windows ipconfig /flushdns equivalent in Mac OS X?
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I'm not sure there's a need for it in OS X.
alexrsAuthor Commented:
When I change the IP address of an entry in the hosts file the system keeps resolving the associated name to the old address.
I figured out that if you go to Network Preferences and change the interface configuration (ex.: to manual address and then back to DHCP) it seems to reload it and clean the DNS cache. As a matter of fact I was expecting that "ifconfig down" and then "up" would cause the same effect, but it doesn't. I will stick to this workaround as the need is not very frequent.

Thanks anyway.

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alexrsAuthor Commented:
Just found the equivalent to Windows' ipconfig /flushdns:

lookupd -flushcache
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