This documentation page lists IPv4 and IPv6 addresses for the Cloudflare DNS resolvers 1.1.1.1 and 1.1.1.1 for Families, providing two addresses per resolver for redundancy. The standard resolver offers DNS lookups with no content filtering. The for Families variant adds automatic filtering to block known malware, phishing and optionally adult content.
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developers.cloudflare.com
whois.domaintools.com
Domain Tools is a web tool for finding, checking, or analyzing online information related to domains, networks, and digital services.
acavalin.com
A blog post listing free DNS resolvers with their IP addresses, origin locations and notes such as logging policy and DNSSEC support. Entries include DNS.watch, Cloudflare, DNScrypt.eu, UncensoredDNS and OpenNIC.
merklemap.com
Merklemap is a subdomain and certificate transparency search engine. It collects Certificate Transparency data by live tailing CT logs and indexing certificates, and offers a web interface, an API, and a CLI for searching subdomains and SSL/TLS certificates.