{"domain":"sas.ac.uk","result":true,"measuredAt":"2026-11-15T16:30:11.738Z","receiptId":"B6bRcVnP1D","answer":{"kind":"host","input":"sas.ac.uk","report":{"host":"sas.ac.uk","checkedAt":"2026-11-15T16:30:11.450Z","a":{"status":"found","values":["51.132.32.57"],"ttl":300,"via":"Cloudflare","cname":[]},"aaaa":{"status":"absent","via":"Cloudflare","cname":[]},"verdict":"ipv4-only","www":{"host":"www.sas.ac.uk","a":{"status":"found","values":["104.20.44.242","172.66.157.170"],"ttl":300,"via":"Cloudflare","cname":["www.sas.ac.uk.cdn.cloudflare.net"]},"aaaa":{"status":"found","values":["2606:4700:10::6814:2cf2","2606:4700:10::ac42:9daa"],"ttl":300,"via":"Cloudflare","cname":["www.sas.ac.uk.cdn.cloudflare.net"]},"verdict":"dual-stack"}},"readiness":{"grade":"D","summary":"The website has no IPv6.","reachabilityTested":true,"checks":[{"key":"web","label":"Website over IPv6","status":"fail","detail":"sas.ac.uk has no AAAA record."},{"key":"www","label":"www over IPv6","status":"pass","detail":"www.sas.ac.uk has 2 IPv6 addresses and answers on every one we tested.","addresses":[{"address":"2606:4700:10::6814:2cf2","result":"answers","port":443},{"address":"2606:4700:10::ac42:9daa","result":"answers","port":443}]},{"key":"mail","label":"Mail servers (MX) have IPv6","status":"pass","detail":"Every mail server has an AAAA record.","hosts":[{"host":"sas-ac-uk.mail.protection.outlook.com","ipv6":true}]},{"key":"dns","label":"Nameservers have IPv6","status":"fail","detail":"No nameserver has an AAAA record — an IPv6-only resolver can't reach this domain's DNS.","hosts":[{"host":"dns-ns1.ucl.ac.uk","ipv6":false},{"host":"ns0.ulcc.ac.uk","ipv6":false},{"host":"ns1.ulcc.ac.uk","ipv6":false},{"host":"dns-ns0.ucl.ac.uk","ipv6":false}]}]}},"states":[{"firstSeen":"2026-11-04T17:59:01.111Z","lastConfirmed":"2026-11-15T16:30:11.738Z","checks":2,"verdict":"ipv4-only","grade":"D","web":"fail","www":"pass","mail":"pass","dns":"fail","secondLook":null}]}