Archive.is requests EDNS information about the subnet that your system is on. Cloudflare doesn't pass this information along since it can be used to determine

Archive.is requests EDNS information about the subnet that your system is on. Cloudflare doesn't pass this information along since it can be used to determine your location in part. So when archive.is doesn't get the subnet info, it sends bogus dns results back and you get that error. See https://jarv.is/notes/cloudflare-dns-archive-is-blocked/ https://jarv.is/notes/cloudflare-dns-archive-is-blocked/ for all the details.