Flushing DNS Cache in OS X 10.11+
Clear DNS Cache on OSX 10.11 El Capitan
$ sudo dscacheutil -flushcache; sudo killall -HUP mDNSResponder; say DNS cache flushed
Clear DNS Cache on OSX 10.11 El Capitan
$ sudo dscacheutil -flushcache; sudo killall -HUP mDNSResponder; say DNS cache flushed