{"kind":"host","input":"ftp.avonet.cz","report":{"host":"ftp.avonet.cz","checkedAt":"2026-11-15T17:58:33.945Z","a":{"status":"found","values":["217.112.162.40"],"ttl":3600,"via":"Cloudflare","cname":["virt.avonet.cz"]},"aaaa":{"status":"found","values":["2a00:6500:0:11::eb:0"],"ttl":3600,"via":"Cloudflare","cname":["virt.avonet.cz"]},"verdict":"dual-stack"},"readiness":{"grade":"A","summary":"Website, mail and DNS all work over IPv6.","reachabilityTested":true,"checks":[{"key":"web","label":"Website over IPv6","status":"pass","detail":"ftp.avonet.cz has an AAAA record and answers on it.","addresses":[{"address":"2a00:6500:0:11::eb:0","result":"answers","port":443}]},{"key":"mail","label":"Mail servers (MX) have IPv6","status":"pass","detail":"No MX records, so mail goes to the domain's own address (implicit MX). It has an AAAA record."},{"key":"dns","label":"Nameservers have IPv6","status":"pass","detail":"3 of 3 nameservers checked have an AAAA record, so IPv6-only resolvers can look the domain up.","hosts":[{"host":"ns.avonet.cz","ipv6":true},{"host":"sns.avonet.cz","ipv6":true},{"host":"tns.avonet.cz","ipv6":true}]}]},"https":{"status":"fail","problem":"certificate","summary":"The certificate served over IPv6 at 2a00:6500:0:11::eb:0 isn't valid for ftp.avonet.cz: DEPTH_ZERO_SELF_SIGNED_CERT.","hops":[{"url":"https://ftp.avonet.cz/","address":"2a00:6500:0:11::eb:0","tls":"DEPTH_ZERO_SELF_SIGNED_CERT"}]},"receiptId":"gEaWQ8pUKH","reused":true,"measuredAt":"2026-11-15T17:58:34.565Z"}