{"kind":"host","input":"ntp.org","report":{"host":"ntp.org","checkedAt":"2026-10-30T19:37:39.538Z","a":{"status":"found","values":["209.148.110.246","204.93.207.22"],"ttl":3401,"via":"Cloudflare","cname":[]},"aaaa":{"status":"found","values":["2001:1838:2000:41b::80:0"],"ttl":3600,"via":"Cloudflare","cname":[]},"verdict":"dual-stack","www":{"host":"www.ntp.org","a":{"status":"found","values":["204.93.207.22","209.148.110.246"],"ttl":1643,"via":"Cloudflare","cname":[]},"aaaa":{"status":"found","values":["2001:1838:2000:41b::80:0","2001:5a8:601:7::80:0"],"ttl":3600,"via":"Cloudflare","cname":[]},"verdict":"dual-stack"}},"readiness":{"grade":"B","summary":"Works over IPv6, with one gap: its mail servers lack IPv6.","reachabilityTested":true,"checks":[{"key":"web","label":"Website over IPv6","status":"pass","detail":"ntp.org has an AAAA record and answers on it.","addresses":[{"address":"2001:1838:2000:41b::80:0","result":"answers","port":443}]},{"key":"www","label":"www over IPv6","status":"pass","detail":"www.ntp.org has 2 IPv6 addresses and answers on every one we tested.","addresses":[{"address":"2001:1838:2000:41b::80:0","result":"answers","port":443},{"address":"2001:5a8:601:7::80:0","result":"answers","port":443}]},{"key":"mail","label":"Mail servers (MX) have IPv6","status":"fail","detail":"None of the mail servers has an AAAA record.","hosts":[{"host":"mx0.chi1.ntfo.org","ipv6":false}]},{"key":"dns","label":"Nameservers have IPv6","status":"pass","detail":"2 of 4 nameservers checked have an AAAA record, so IPv6-only resolvers can look the domain up.","hosts":[{"host":"ns1.everett.org","ipv6":true},{"host":"anyns.pch.net","ipv6":true},{"host":"dns1.udel.edu","ipv6":false},{"host":"dns2.udel.edu","ipv6":false}]}]},"https":{"status":"pass","summary":"Loads over IPv6 with a valid certificate after 1 redirect: HTTP 200.","hops":[{"url":"https://ntp.org/","address":"2001:1838:2000:41b::80:0","status":302,"tls":"valid"},{"url":"https://www.ntp.org/","address":"2001:1838:2000:41b::80:0","status":200,"tls":"valid"}]},"receiptId":"tssOnUh894"}