How To Flush DNS Cache on macOS?

The macOS stores the name resolution information like computer hostnames, account user names, group names, and others as the DNS cache. It helps to considerably quicken the project’s load times as the IP addresses for the queried domains are stored in the cache. The DNS cache allows the system to answer queries more directly rather than rerouting to DNS servers.

To Flush DNS on macOS

1. Open Applications and go to Utilities or press Command+Space. It will launch Spotlight.

2. Search for the Terminal application by entering Terminal in the Search box.

3. Run the terminal.app

4. Enter:

sudo killall -HUP mDNSResponder

5. Press the Return button on the keyboard.

6. Enter the administrator password of the account and press the Return key.

Note: To find out if the DNS flush is finished, you can turn on an audible alert. After typing the command, you must type say and input a notification message.

For Example,

sudo killall -HUP mDNSResponder; say dns is flushed successfully