{"kind":"host","input":"master.cz","report":{"host":"master.cz","checkedAt":"2026-11-04T18:37:13.543Z","a":{"status":"found","values":["80.79.16.235"],"ttl":300,"via":"Cloudflare","cname":[]},"aaaa":{"status":"found","values":["2a01:430:100:2b::5"],"ttl":300,"via":"Cloudflare","cname":[]},"verdict":"dual-stack","www":{"host":"www.master.cz","a":{"status":"found","values":["80.79.16.235"],"ttl":300,"via":"Cloudflare","cname":[]},"aaaa":{"status":"found","values":["2a01:430:100:2b::5"],"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":"master.cz has an AAAA record and answers on it.","addresses":[{"address":"2a01:430:100:2b::5","result":"answers","port":443}]},{"key":"www","label":"www over IPv6","status":"pass","detail":"www.master.cz has an AAAA record and answers on it.","addresses":[{"address":"2a01:430:100:2b::5","result":"answers","port":443}]},{"key":"mail","label":"Mail servers (MX) have IPv6","status":"pass","detail":"Every mail server has an AAAA record.","hosts":[{"host":"mail.master.cz","ipv6":true},{"host":"ns3.master.cz","ipv6":true}]},{"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 after 1 redirect: HTTP 200.","hops":[{"url":"https://master.cz/","address":"2a01:430:100:2b::5","status":301,"tls":"valid"},{"url":"https://www.master.cz/","address":"2a01:430:100:2b::5","status":200,"tls":"valid"}]},"receiptId":"yFEMQKt9pD","reused":true,"measuredAt":"2026-11-04T18:37:14.596Z"}