{"domain":"cssz.cz","result":true,"measuredAt":"2026-11-12T04:52:44.366Z","receiptId":"klWPwGp8_I","answer":{"kind":"host","input":"cssz.cz","report":{"host":"cssz.cz","checkedAt":"2026-11-12T04:52:41.425Z","a":{"status":"found","values":["91.195.107.169"],"ttl":300,"via":"Cloudflare","cname":[]},"aaaa":{"status":"found","values":["2001:af0:fff6:ee02::28"],"ttl":300,"via":"Cloudflare","cname":[]},"verdict":"dual-stack","www":{"host":"www.cssz.cz","a":{"status":"found","values":["150.171.109.118"],"ttl":10,"via":"Cloudflare","cname":["ep-ikr-cndmeub5ewbxb2bv.z01.azurefd.net","mr-z01.tm-azurefd.net"]},"aaaa":{"status":"found","values":["2603:1061:14:4c::1"],"ttl":10,"via":"Cloudflare","cname":["ep-ikr-cndmeub5ewbxb2bv.z01.azurefd.net","mr-z01.tm-azurefd.net"]},"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":"cssz.cz has an AAAA record and answers on it.","addresses":[{"address":"2001:af0:fff6:ee02::28","result":"answers","port":443}]},{"key":"www","label":"www over IPv6","status":"pass","detail":"www.cssz.cz has an AAAA record and answers on it.","addresses":[{"address":"2603:1061:14:4c::1","result":"answers","port":443}]},{"key":"mail","label":"Mail servers (MX) have IPv6","status":"pass","detail":"Every mail server has an AAAA record.","hosts":[{"host":"mail01-2x.cssz.cz","ipv6":true},{"host":"mail01-xx.cssz.cz","ipv6":true}]},{"key":"dns","label":"Nameservers have IPv6","status":"pass","detail":"2 of 5 nameservers checked have an AAAA record, so IPv6-only resolvers can look the domain up.","hosts":[{"host":"dns.cssz.cz","ipv6":true},{"host":"dns2.cssz.cz","ipv6":true},{"host":"dns3.cssz.cz","ipv6":false},{"host":"dns4.cssz.cz","ipv6":false},{"host":"sdns.zarea.net","ipv6":false}]}]},"https":{"status":"pass","summary":"Loads over IPv6 with a valid certificate after 2 redirects: HTTP 200.","hops":[{"url":"https://cssz.cz/","address":"2001:af0:fff6:ee02::28","status":301,"tls":"valid"},{"url":"https://www.cssz.cz/","address":"2603:1061:14:4c::1","status":301,"tls":"valid"},{"url":"https://www.cssz.gov.cz/","address":"2603:1061:14:48::1","status":200,"tls":"valid"}]}},"states":[{"firstSeen":"2026-11-12T04:52:44.366Z","lastConfirmed":"2026-11-12T04:52:44.366Z","checks":1,"verdict":"dual-stack","grade":"A","web":"pass","www":"pass","mail":"pass","dns":"pass","secondLook":null}]}