Authoritative and Secondary DNS - Cloudflare
https://www.cloudflare.com/dnsCloudflare’s 1.1.1.1 is the world’s fastest and most reliable public DNS resolver* Cloudflare DNS is an enterprise-grade authoritative DNS service that offers the fastest response time, unparalleled redundancy, and advanced security with built-in DDoS mitigation and DNSSEC. Cloudflare is used as a reverse proxy by more than 10% of all websites**