Macbook: View the list of DNS nameservers used for resolution

To view the list of nameservers your mac is using, simply open Terminal and paste the following:

myMac ~ % scutil --dns | grep 'nameserver*'
  nameserver[0] : 100.64.0.1
  nameserver[0] : 9.9.9.9
  nameserver[1] : 1.1.1.1
  nameserver[2] : 8.8.8.8
  nameserver[0] : 9.9.9.9
  nameserver[1] : 1.1.1.1
  nameserver[2] : 8.8.8.8

Alternatively, you can copy the DNS servers to clipboard directly from the command line (using pbcopy):

networksetup -getdnsservers Wi-Fi | pbcopy