Change DNS server on Mac from command line

Fetch DNS servers list

networksetup -getdnsservers Wi-Fi

Set DNS servers list

Format: networksetup -setdnsservers (Network Service) (DNS IP list)

networksetup -setdnsservers Wi-Fi 208.67.222.222 208.67.220.220 8.8.8.8 8.8.4.4

 

References:
http://osxdaily.com/2015/06/02/change-dns-command-line-mac-os-x/