Does Cloudflare support EDNS0 (extension mechanisms for DNS)?

Yes, Cloudflare DNS supports EDNS0.

EDNS0 is enabled for all Cloudflare customers.

EDNS0 is a building block for modern DNS implementations that adds support for signaling if the DNS Resolver (recursive DNS provider) supports larger message sizes and DNSSEC.

EDNS0 is the first approved set of mechanisms for DNS extensions, originally published as RFC 2671.

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