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rad.dad - Rad email, web stuff, and DNS
Quad9 - Quad9 is a free, recursive, anycast DNS platform that provides end users robust security protections, high-performance, and privacy.
AdGuard DNS - Soon you'll be able to create your own private DNS server that will protect your personal data, block ads and trackers, and allow you to control access to specific Internet content.
NextDNS - Block ads, trackers and malicious websites on all your devices.
WhoisXML API - Domain, IP, and DNS data provider
OpenDNS - OpenDNS provides faster and safer Internet access for your home or Business.