Windows: Open Command Prompt as Administrator
Windows: Run `ipconfig /flushdns`
Windows: Restart the DNS Client service if needed
macOS: Open Terminal
macOS: Run `sudo dscacheutil -flushcache`
macOS: Run `sudo killall -HUP mDNSResponder`
Linux with systemd-resolved: Run `sudo resolvectl flush-caches`
Linux with nscd: Run `sudo systemctl restart nscd`
Linux with dnsmasq: Run `sudo systemctl restart dnsmasq`
Chrome: Go to `chrome://net-internals/#dns`
Chrome: Click Clear host cache
Firefox: Restart the browser
Router: Reboot the router if needed
Mobile: Toggle airplane mode on and off
Mobile: Restart the device if needed