Force your mac to flush the local DNS cache.

Flush local DNS cache on macOS BigSur.

To flush the DNS on your mac, open a terminal and enter the following command:

sudo dscacheutil -flushcache; sudo killall -HUP mDNSResponder

Enter your password and the local DNS cache will be flushed.

Written by Loek van den Ouweland on 2021-08-12.
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