>"it seems that archive.is responds to queries from Cloudflare’s systems with an incorrect response."
What makes the response incorrect? I was under the impression that DNS implementations were under no "practical" obligation to return consistent queries to differing requester IP addresses (hence stuff like split-horizon DNS and EDNS: https://developers.google.com/speed/public-dns/docs/ecs )
not to mention that the commands themselves obey absolutely zero *NIX conventions at all. Left a bad taste in my mouth ever since