Flushing DNS Cache on MacBook Pro with macOS Big Sur

How do I flush the DNS Cache on a MacBook Pro with the Big Sur OS?



[Re-Titled by Moderator]

Original Title: Flushing DNS Cache

Posted on Oct 20, 2025 8:43 AM

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Posted on Oct 20, 2025 3:39 PM

On Big Sur, DNS is managed by the mDNSResponder process.


Restarting this process clears the cache. You can do it via the Terminal using:


sudo killall -HUP mDNSResponder


You'll need to be an admin and provide your administrator password when prompted.

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Flushing DNS Cache on MacBook Pro with macOS Big Sur

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