{"kind":"host","input":"cornell.edu","report":{"host":"cornell.edu","checkedAt":"2026-10-31T08:50:27.444Z","a":{"status":"found","values":["128.253.173.241","128.253.173.242","128.253.173.243","128.253.173.244","128.253.173.246","128.253.173.245"],"ttl":84507,"via":"Cloudflare","cname":[]},"aaaa":{"status":"absent","via":"Cloudflare","cname":[]},"verdict":"ipv4-only","www":{"host":"www.cornell.edu","a":{"status":"found","values":["150.171.109.77"],"ttl":10,"via":"Cloudflare","cname":["cornell-edge-ekhkdhg5czdmb2bf.z01.azurefd.net","mr-z01.tm-azurefd.net"]},"aaaa":{"status":"found","values":["2603:1061:14:4b::1"],"ttl":10,"via":"Cloudflare","cname":["cornell-edge-ekhkdhg5czdmb2bf.z01.azurefd.net","mr-z01.tm-azurefd.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":"cornell.edu has no AAAA record."},{"key":"www","label":"www over IPv6","status":"pass","detail":"www.cornell.edu has an AAAA record and answers on it.","addresses":[{"address":"2603:1061:14:4b::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":"cornell-edu.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":"drdns.cit.cornell.edu","ipv6":false},{"host":"dns.cit.cornell.edu","ipv6":false},{"host":"cudns.cit.cornell.edu","ipv6":false},{"host":"drdns2.cit.cornell.edu","ipv6":false},{"host":"bigred.cit.cornell.edu","ipv6":false}]}]},"receiptId":"S9MKPe79th"}