{"kind":"host","input":"loc.gov","report":{"host":"loc.gov","checkedAt":"2026-10-31T08:51:56.238Z","a":{"status":"found","values":["104.17.6.58","104.18.64.82"],"ttl":25,"via":"Cloudflare","cname":[]},"aaaa":{"status":"found","values":["2606:4700::6811:63a","2606:4700::6812:4052"],"ttl":300,"via":"Cloudflare","cname":[]},"verdict":"dual-stack","www":{"host":"www.loc.gov","a":{"status":"found","values":["104.18.64.82","104.17.6.58"],"ttl":210,"via":"Cloudflare","cname":[]},"aaaa":{"status":"found","values":["2606:4700::6811:63a","2606:4700::6812:4052"],"ttl":300,"via":"Cloudflare","cname":[]},"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":"loc.gov has 2 IPv6 addresses and answers on every one we tested.","addresses":[{"address":"2606:4700::6811:63a","result":"answers","port":443},{"address":"2606:4700::6812:4052","result":"answers","port":443}]},{"key":"www","label":"www over IPv6","status":"pass","detail":"www.loc.gov has 2 IPv6 addresses and answers on every one we tested.","addresses":[{"address":"2606:4700::6811:63a","result":"answers","port":443},{"address":"2606:4700::6812:4052","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-00026101.gslb.gpphosted.com","ipv6":false},{"host":"mxb-00026101.gslb.gpphosted.com","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":"alice.ns.cloudflare.com","ipv6":true},{"host":"kevin.ns.cloudflare.com","ipv6":true}]}]},"https":{"status":"pass","summary":"Loads over IPv6 with a valid certificate after 1 redirect: HTTP 200.","hops":[{"url":"https://loc.gov/","address":"2606:4700::6811:63a","status":301,"tls":"valid"},{"url":"https://www.loc.gov/","address":"2606:4700::6811:63a","status":200,"tls":"valid"}]},"receiptId":"lPK3bDWGNK"}