{"kind":"host","input":"fb.com","report":{"host":"fb.com","checkedAt":"2026-10-31T05:55:52.489Z","a":{"status":"found","values":["57.145.2.1"],"ttl":5,"via":"Cloudflare","cname":[]},"aaaa":{"status":"found","values":["2a03:2880:f373:1:face:b00c:0:25de"],"ttl":60,"via":"Cloudflare","cname":[]},"verdict":"dual-stack","www":{"host":"www.fb.com","a":{"status":"found","values":["57.145.2.1"],"ttl":60,"via":"Cloudflare","cname":["www.facebook.com","star-mini.c10r.facebook.com"]},"aaaa":{"status":"found","values":["2a03:2880:f31d:1:face:b00c:0:25de"],"ttl":60,"via":"Cloudflare","cname":["www.facebook.com","star-mini.c10r.facebook.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":"fb.com has an AAAA record and answers on it.","addresses":[{"address":"2a03:2880:f373:1:face:b00c:0:25de","result":"answers","port":443}]},{"key":"www","label":"www over IPv6","status":"pass","detail":"www.fb.com has an AAAA record and answers on it.","addresses":[{"address":"2a03:2880:f31d:1:face:b00c:0:25de","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":"mxa-00082601.gslb.pphosted.com","ipv6":false},{"host":"mx0a-00082601.pphosted.com","ipv6":false},{"host":"mx0b-00082601.pphosted.com","ipv6":false},{"host":"mxb-00082601.gslb.pphosted.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":"c.ns.facebook.com","ipv6":true},{"host":"d.ns.facebook.com","ipv6":true},{"host":"b.ns.facebook.com","ipv6":true},{"host":"a.ns.facebook.com","ipv6":true}]}]},"https":{"status":"pass","summary":"Loads over IPv6 with a valid certificate after 1 redirect: HTTP 200.","hops":[{"url":"https://fb.com/","address":"2a03:2880:f373:1:face:b00c:0:25de","status":301,"tls":"valid"},{"url":"https://www.facebook.com/","address":"2a03:2880:f373:1:face:b00c:0:25de","status":200,"tls":"valid"}]},"receiptId":"kHH6wA4WoJ"}