{"kind":"host","input":"duolingo.com","report":{"host":"duolingo.com","checkedAt":"2026-10-31T06:13:49.573Z","a":{"status":"found","values":["35.172.6.9","44.195.214.236","34.205.213.191","184.192.161.228","18.232.212.172","44.216.70.103"],"ttl":60,"via":"Cloudflare","cname":[]},"aaaa":{"status":"absent","via":"Cloudflare","cname":[]},"verdict":"ipv4-only","www":{"host":"www.duolingo.com","a":{"status":"found","values":["13.227.65.44","13.227.65.121","13.227.65.22","13.227.65.2"],"ttl":6,"via":"Cloudflare","cname":[]},"aaaa":{"status":"absent","via":"Cloudflare","cname":[]},"verdict":"ipv4-only"}},"readiness":{"grade":"D","summary":"The website has no IPv6.","reachabilityTested":true,"checks":[{"key":"web","label":"Website over IPv6","status":"fail","detail":"duolingo.com has no AAAA record."},{"key":"www","label":"www over IPv6","status":"fail","detail":"www.duolingo.com has no AAAA record."},{"key":"mail","label":"Mail servers (MX) have IPv6","status":"pass","detail":"Every mail server has an AAAA record.","hosts":[{"host":"aspmx.l.google.com","ipv6":true},{"host":"alt1.aspmx.l.google.com","ipv6":true},{"host":"alt2.aspmx.l.google.com","ipv6":true},{"host":"aspmx2.googlemail.com","ipv6":true},{"host":"aspmx3.googlemail.com","ipv6":true},{"host":"aspmx4.googlemail.com","ipv6":true},{"host":"aspmx5.googlemail.com","ipv6":true}]},{"key":"dns","label":"Nameservers have IPv6","status":"pass","detail":"4 of 4 nameservers checked have an AAAA record, so IPv6-only resolvers can look the domain up.","hosts":[{"host":"ns-1020.awsdns-63.net","ipv6":true},{"host":"ns-1117.awsdns-11.org","ipv6":true},{"host":"ns-1904.awsdns-46.co.uk","ipv6":true},{"host":"ns-247.awsdns-30.com","ipv6":true}]}]},"receiptId":"ZOymfAsDR2"}