Clearing browser DNS cache

Jul 19, 2022
1 minute read

I currently use NextDNS as my personal DNS server and adblocker, along with DNSSwitcher for Mac. With this setup I can quickly switch between different DNS servers quickly and unblock certain websites instead of going to nextdns and adding them to the allowlist. The problem here is that even after changing my DNS servers, browsers have their own internal DNS caches which refreshes at its own pace and would still send me to the NextDNS block page. Thus i needed a way to quickly clear cache on the browser if that happens.

To clear cache on

  • Firefox visit about:networking#dns on the address bar and click on Clear DNS Cache
  • Chrome visit chrome://net-internals/#dns on the address bar and goto tab DNS click on Clear host cache

The DNS is not only cached on the browser, but by the OS and perhaps various other layers.

To clear cache on MacOSX run the following

sudo dscacheutil -flushcache && sudo killall -HUP mDNSResponder

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