{"kind":"host","input":"harvard.edu","report":{"host":"harvard.edu","checkedAt":"2026-10-31T08:53:03.846Z","a":{"status":"found","values":["192.0.66.20"],"ttl":300,"via":"Cloudflare","cname":[]},"aaaa":{"status":"absent","via":"Cloudflare","cname":[]},"verdict":"ipv4-only","www":{"host":"www.harvard.edu","a":{"status":"found","values":["192.0.66.20"],"ttl":152,"via":"Cloudflare","cname":["harvard-edu.go-vip.net"]},"aaaa":{"status":"found","values":["2a04:fa87:fffd::c000:4214"],"ttl":295,"via":"Cloudflare","cname":["harvard-edu.go-vip.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":"harvard.edu has no AAAA record."},{"key":"www","label":"www over IPv6","status":"pass","detail":"www.harvard.edu has an AAAA record and answers on it.","addresses":[{"address":"2a04:fa87:fffd::c000:4214","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":"mx0a-00171101.pphosted.com","ipv6":false},{"host":"mx0b-00171101.pphosted.com","ipv6":false}]},{"key":"dns","label":"Nameservers have IPv6","status":"pass","detail":"6 of 6 nameservers checked have an AAAA record, so IPv6-only resolvers can look the domain up.","hosts":[{"host":"a6-66.akam.net","ipv6":true},{"host":"a7-65.akam.net","ipv6":true},{"host":"a1-171.akam.net","ipv6":true},{"host":"a10-66.akam.net","ipv6":true},{"host":"a11-67.akam.net","ipv6":true},{"host":"a16-64.akam.net","ipv6":true}]}]},"receiptId":"30l66pCIB1"}