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CrazyStat | on: #41456637
EDNS subnet/ECS is an optional DNS extension. DNS requests have no obligation to provide it. archive.is's behavior is in violation of RFC 7871 [1]:

> Note again that a query MUST NOT be refused solely because it provides 0 address bits.

The shenanigans are absolutely on archive.is's side here.

[1] https://www.rfc-editor.org/rfc/rfc7871#section-7.5

greyface- | parent
When the RFC refers to a query being refused, it's talking about a response with rcode=REFUSED. Archive.is is responding with rcode=NOERROR and bogus RR data. Shenanigans? Yes. RFC violation? No.
CrazyStat | root | parent
Perhaps technically not a violation but clearly against the spirit of the RFC.