{"kind":"host","input":"mail.master.cz","report":{"host":"mail.master.cz","checkedAt":"2026-11-05T16:06:58.709Z","a":{"status":"found","values":["81.31.43.64"],"ttl":300,"via":"Cloudflare","cname":[]},"aaaa":{"status":"found","values":["2a01:430:100:5c::2"],"ttl":300,"via":"Cloudflare","cname":[]},"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":"mail.master.cz has an AAAA record and answers on it.","addresses":[{"address":"2a01:430:100:5c::2","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":"ns1.master.cz","ipv6":true},{"host":"ns2.master.cz","ipv6":true},{"host":"ns3.master.cz","ipv6":true}]}]},"https":{"status":"pass","summary":"Loads over IPv6 with a valid certificate: HTTP 200.","hops":[{"url":"https://mail.master.cz/","address":"2a01:430:100:5c::2","status":200,"tls":"valid"}]},"receiptId":"I0MbXKUNWY","reused":true,"measuredAt":"2026-11-05T16:06:59.451Z"}