How to check which Name Servers your computer is using in Ubuntu

If you have Dekstop version with network manager installed:

nmcli dev show | grep DNS

A better way for servers:

systemd-resolve –status

Not

cat /etc/resolv.conf will give you

nameserver 127.0.0.1

or

nameserver 127.0.0.53

because Ubuntu uses dnsmasq, resolvconf, or more recently systemd to get it’s name servers from Network Manager.