1.1.1.1 is a free DNS service by Cloudflare
See Cloudflare’s privacy policy here
1.1.1.1
1.0.0.1
Quad9 is a non profit DNS provider started by IBM, Global Cyber Alliance and Packet Clearing House
See Quad9’s privacy policy here
9.9.9.9
149.112.112.112
AdGuard DNS blocks ads. It can be configured not to block ads if you wish
See AdGuard’s privacy policy here
94.140.14.14
94.140.15.15