dscacheutil -flushcache; sudo killall -HUP mDNSResponder
sudo dscacheutil -flushcache; sudo killall -HUP mDNSResponder
macbook$ sudo killall -HUP mDNSResponder;sudo killall mDNSResponderHelper;sudo dscacheutil -flushcache
sudo dscacheutil -flushcache;sudo killall -HUP mDNSResponder