{"kind":"host","input":"youku.com","report":{"host":"youku.com","checkedAt":"2026-10-31T18:10:14.593Z","a":{"status":"found","values":["106.11.43.158"],"ttl":176,"via":"Cloudflare","cname":[]},"aaaa":{"status":"found","values":["2408:4001:f10::fd","2408:4001:f10::8","2408:4001:f00::3a","2408:4001:f00::1af"],"ttl":300,"via":"Cloudflare","cname":[]},"verdict":"dual-stack","www":{"host":"www.youku.com","a":{"status":"found","values":["47.246.99.254"],"ttl":9,"via":"Cloudflare","cname":["ipv6-aserver-heyi.m.taobao.com","ipv6-aserver-heyi.m.taobao.com.gds.alibabadns.com"]},"aaaa":{"status":"found","values":["2408:4001:f10::8"],"ttl":30,"via":"Cloudflare","cname":["ipv6-aserver-heyi.m.taobao.com","ipv6-aserver-heyi.m.taobao.com.gds.alibabadns.com"]},"verdict":"dual-stack"}},"readiness":{"grade":"B","summary":"Works over IPv6, with one gap: its mail servers lack IPv6.","reachabilityTested":true,"checks":[{"key":"web","label":"Website over IPv6","status":"pass","detail":"youku.com has 4 IPv6 addresses and answers on every one we tested.","addresses":[{"address":"2408:4001:f10::fd","result":"answers","port":443},{"address":"2408:4001:f10::8","result":"answers","port":443},{"address":"2408:4001:f00::3a","result":"answers","port":443},{"address":"2408:4001:f00::1af","result":"answers","port":443}]},{"key":"www","label":"www over IPv6","status":"pass","detail":"www.youku.com has an AAAA record and answers on it.","addresses":[{"address":"2408:4001:f10::8","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":"mx2.youku.com","ipv6":false},{"host":"mx1.youku.com","ipv6":false}]},{"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":"dns4.youku.com","ipv6":true},{"host":"dns3.youku.com","ipv6":true},{"host":"dns2.youku.com","ipv6":true},{"host":"dns1.youku.com","ipv6":true}]}]},"https":{"status":"pass","summary":"Loads over IPv6 with a valid certificate: HTTP 200.","hops":[{"url":"https://youku.com/","address":"2408:4001:f10::fd","status":200,"tls":"valid"}]},"receiptId":"TxpXMl-7ow"}