{"kind":"host","input":"firmy.cz","report":{"host":"firmy.cz","checkedAt":"2026-11-15T15:50:15.230Z","a":{"status":"found","values":["77.75.76.191"],"ttl":1571,"via":"Cloudflare","cname":[]},"aaaa":{"status":"found","values":["2a02:598:2::191"],"ttl":3600,"via":"Cloudflare","cname":[]},"verdict":"dual-stack","www":{"host":"www.firmy.cz","a":{"status":"found","values":["77.75.76.191"],"ttl":1212,"via":"Cloudflare","cname":["firmy.cz"]},"aaaa":{"status":"found","values":["2a02:598:2::191"],"ttl":2497,"via":"Cloudflare","cname":["firmy.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":"firmy.cz has an AAAA record and answers on it.","addresses":[{"address":"2a02:598:2::191","result":"answers","port":443}]},{"key":"www","label":"www over IPv6","status":"pass","detail":"www.firmy.cz has an AAAA record and answers on it.","addresses":[{"address":"2a02:598:2::191","result":"answers","port":443}]},{"key":"mail","label":"Mail servers (MX) have IPv6","status":"pass","detail":"Every mail server has an AAAA record.","hosts":[{"host":"bb4bdcba74d9f0f3.mx1.emailprofi.seznam.cz","ipv6":true},{"host":"bb4bdcba74d9f0f3.mx2.emailprofi.seznam.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":"ams.seznam.cz","ipv6":true},{"host":"ans.seznam.cz","ipv6":true}]}]},"https":{"status":"pass","summary":"Loads over IPv6 with a valid certificate after 1 redirect: HTTP 200.","hops":[{"url":"https://firmy.cz/","address":"2a02:598:2::191","status":301,"tls":"valid"},{"url":"https://www.firmy.cz/","address":"2a02:598:2::191","status":200,"tls":"valid"}]},"receiptId":"rBKOPHMwAe","reused":true,"measuredAt":"2026-11-15T15:50:16.584Z"}