How to Clear DNS Cache in MacOS Sierra

Open the Terminal application, found in the Utilities folder within Applications.

Enter the following command syntax exactly:

sudo killall -HUP mDNSResponder;say DNS cache has been flushed

Or if that fails, you can try:

sudo killall -HUP mDNSResponder;sudo killall mDNSResponderHelper;sudo dscacheutil -flushcache;say MacOS DNS cache has been cleared

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