{"domain":"web4u.cz","result":true,"measuredAt":"2026-11-15T15:46:33.048Z","receiptId":"iUr64cOaVg","answer":{"kind":"host","input":"web4u.cz","report":{"host":"web4u.cz","checkedAt":"2026-11-15T15:46:31.835Z","a":{"status":"found","values":["81.91.86.19"],"ttl":60,"via":"Cloudflare","cname":[]},"aaaa":{"status":"found","values":["2001:1568::19"],"ttl":60,"via":"Cloudflare","cname":[]},"verdict":"dual-stack","www":{"host":"www.web4u.cz","a":{"status":"found","values":["81.91.86.19"],"ttl":60,"via":"Cloudflare","cname":[]},"aaaa":{"status":"found","values":["2001:1568::19"],"ttl":60,"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":"web4u.cz has an AAAA record and answers on it.","addresses":[{"address":"2001:1568::19","result":"answers","port":443}]},{"key":"www","label":"www over IPv6","status":"pass","detail":"www.web4u.cz has an AAAA record and answers on it.","addresses":[{"address":"2001:1568::19","result":"answers","port":443}]},{"key":"mail","label":"Mail servers (MX) have IPv6","status":"pass","detail":"Every mail server has an AAAA record.","hosts":[{"host":"mx.web4u.cz","ipv6":true}]},{"key":"dns","label":"Nameservers have IPv6","status":"pass","detail":"2 of 2 nameservers checked have an AAAA record, so IPv6-only resolvers can look the domain up.","hosts":[{"host":"ns.web4u.cz","ipv6":true},{"host":"ns2.web4u.cz","ipv6":true}]}]},"https":{"status":"pass","summary":"Loads over IPv6 with a valid certificate after 1 redirect: HTTP 200.","hops":[{"url":"https://web4u.cz/","address":"2001:1568::19","status":301,"tls":"valid"},{"url":"https://www.web4u.cz/","address":"2001:1568::19","status":200,"tls":"valid"}]}},"states":[{"firstSeen":"2026-11-04T23:50:32.376Z","lastConfirmed":"2026-11-15T15:46:33.048Z","checks":2,"verdict":"dual-stack","grade":"A","web":"pass","www":"pass","mail":"pass","dns":"pass","secondLook":null}]}