Rascals are always sociable, and the chief sign that a man has any nobility in his character is the little pleasure he takes in others company. Arthur Schopenhauer

If you need a public DNS resolver you can use DNS.

For IPv4:

For IPv6:


You can use DNS-over-HTTPS with Mozilla Firefox and Thunderbird too.

In Firefox open the about:config page and change network.trr.mode to 2 to use DNS Over HTTPS but keep regular DNS as a fallback. Change network.trr.uri to too.

In Thunderbird open Preferences, General tab, scroll down and press the Config Editor button. Change network.trr.mode to 2 (same reason as Firefox above) and update network.trr.custom_uri, network.trr.default_provider_uri and network.trr.uri to too.