The command did flush the Directory Service cache, but DNS is no longer part of it. You can still use its query command though. dscacheutil -q host -a name

The command did flush the Directory Service cache, but DNS is no longer part of it. You can still use its query command though. dscacheutil -q host -a name www.example.com On the topic, easiest way to see if dscacheutil -flushcache work or not is to probably do something like: dscacheutil -q host -a name www.example.com # Make sure it's in the cache prior to running. sudo dscacheutil -flushcache dscacheutil -q host -a name www.example.com # Notice if there's a slight delay for the lookup. sudo killall -HUP mDNSResponder dscacheutil -q host -a name www.example.com # Notice if there's a slight delay for the lookup.