January 18, 2018

Flush DNS Cache on macOS Sierra

The three terminal commands to clear your DNS cache on macOS Sierra.

macos
networking
troubleshooting

If you’re experiencing DNS resolution issues on macOS Sierra, flush the cache with these three commands:

sudo killall -HUP mDNSResponder
sudo killall mDNSResponderHelper
sudo dscacheutil -flushcache

This kills the mDNSResponder processes and clears the dscacheutil cache. After running these, your Mac will perform fresh DNS lookups for all domains.