Cloudflare, Inc. · AS13335
1.0.0.1 is the secondary resolver of Cloudflare Public DNS, intended to be configured alongside 1.1.1.1. The two share infrastructure, policies, and audited privacy commitments.
Always pair 1.1.1.1 with 1.0.0.1 in DNS settings — a single resolver is a single point of failure. If your primary becomes unreachable, the OS retries on the secondary.
1.0.0.1 is part of 1.0.0.0/24, served by Cloudflare via anycast. Supports DNS over UDP/TCP 53, DNS-over-TLS on 853, and DNS-over-HTTPS at cloudflare-dns.com. DNSSEC enabled by default.
Functionally no — same service, same policies, same anycast network. The two IPs exist for primary/secondary redundancy.
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