{"kind":"host","input":"jhu.edu","report":{"host":"jhu.edu","checkedAt":"2026-11-01T06:37:26.067Z","a":{"status":"found","values":["128.220.193.2"],"ttl":3600,"via":"Cloudflare","cname":[]},"aaaa":{"status":"absent","via":"Cloudflare","cname":[]},"verdict":"ipv4-only","www":{"host":"www.jhu.edu","a":{"status":"found","values":["172.64.155.183","104.18.32.73"],"ttl":69,"via":"Cloudflare","cname":["www.jhu.edu.cdn.cloudflare.net"]},"aaaa":{"status":"found","values":["2606:4700:4400::ac40:9bb7","2606:4700:440d::6812:2049"],"ttl":300,"via":"Cloudflare","cname":["www.jhu.edu.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":"jhu.edu has no AAAA record."},{"key":"www","label":"www over IPv6","status":"pass","detail":"www.jhu.edu has 2 IPv6 addresses and answers on every one we tested.","addresses":[{"address":"2606:4700:4400::ac40:9bb7","result":"answers","port":443},{"address":"2606:4700:440d::6812:2049","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":"smtp.johnshopkins.edu","ipv6":false}]},{"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":"ens1.jhu.edu","ipv6":true},{"host":"ens1.jhmi.edu","ipv6":true}]}]},"receiptId":"NJu9a7Vkrh","reused":true,"measuredAt":"2026-11-01T06:37:26.117Z"}