Today I Learned: How to flush DNS on macOS Big Sur
Brendan Thompson • 9 March 2021
One thing I continually forget how to do is how to flush DNS on a macOS, to give Windows one piece of credit I must say it is very easy to flush DNS there.
Any time I do any sort of development that requires changes to DNS recores, or I decide I want to update hosting provides I always have to muck around awhile before I get this going.
Flushing DNS is relatively simple, it requires one to execute a couple of commands from a Terminal/ iTerm window.
It is important to note, that you will require
sudopermissions for the following command(s).
The below are the commands that are required in order to flush DNS.
sudo dscacheutil -flushcache sudo killall -HUP mDNSResponder