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I coded a GeoDNS for a couple of my sites and Cloudflare‘s IPs are always geolocated to the nearest datacenters and works great in a GeoDNS setting.

Also, what about DNS resolvers that don’t support EDNS at all?

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The check archive.is uses to return garbage is specifically for cloudflare's IPs all other non-EDNS works fine. You can dig to there authoritative DNS server yourself to see.

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