Nah the EDNS Client Subnet is explicitly optional and the RFC makes it very clear you're not required to implement it. They are very open that they, archive.is,

Nah the EDNS Client Subnet is explicitly optional and the RFC makes it very clear you're not required to implement it. They are very open that they, archive.is, are violating the spec. They maybe could justify a SERVFAIL but instead they just lie in the response. It's actually funny from time to time archive.is works just fine via cloudflare I'm assume when whatever IP list archive.is is using happens to be missing some of cloudflares addresses. You can tell they use a specific cloudflare targeting list because issuing a DIG from you local computer without the EDNS Client Subnet works perfectly fine.