{"domain":"genome.gov","result":true,"measuredAt":"2026-11-13T11:09:20.750Z","receiptId":"VKRRORTxVw","answer":{"kind":"host","input":"genome.gov","report":{"host":"genome.gov","checkedAt":"2026-11-13T11:09:20.703Z","a":{"status":"found","values":["128.231.91.30"],"ttl":24966,"via":"Cloudflare","cname":[]},"aaaa":{"status":"found","values":["2607:f220:404:1002::80e7:5b1e"],"ttl":28800,"via":"Cloudflare","cname":[]},"verdict":"dual-stack","www":{"host":"www.genome.gov","a":{"status":"found","values":["52.45.214.169"],"ttl":28800,"via":"Cloudflare","cname":[]},"aaaa":{"status":"absent","via":"Cloudflare","cname":[]},"verdict":"ipv4-only"}},"readiness":{"grade":"B","summary":"Works over IPv6, with one gap: www doesn't fully work over IPv6.","reachabilityTested":true,"checks":[{"key":"web","label":"Website over IPv6","status":"pass","detail":"genome.gov has an AAAA record and answers on it.","addresses":[{"address":"2607:f220:404:1002::80e7:5b1e","result":"answers","port":443}]},{"key":"www","label":"www over IPv6","status":"fail","detail":"www.genome.gov has no AAAA record."},{"key":"mail","label":"Mail servers (MX) have IPv6","status":"pass","detail":"No MX records, so mail goes to the domain's own address (implicit MX). It has an AAAA record."},{"key":"dns","label":"Nameservers have IPv6","status":"pass","detail":"3 of 3 nameservers checked have an AAAA record, so IPv6-only resolvers can look the domain up.","hosts":[{"host":"ns.nih.gov","ipv6":true},{"host":"ns2.nih.gov","ipv6":true},{"host":"ns3.nih.gov","ipv6":true}]}]},"https":{"status":"fail","problem":"redirect-no-ipv6","summary":"Redirects to www.genome.gov, which has no IPv6 address — so IPv6 visitors end up needing IPv4 after all.","hops":[{"url":"https://genome.gov/","address":"2607:f220:404:1002::80e7:5b1e","status":301,"tls":"valid"},{"url":"https://www.genome.gov/","note":"redirects to www.genome.gov, which has no IPv6 address"}]}},"states":[{"firstSeen":"2026-11-04T17:36:14.450Z","lastConfirmed":"2026-11-13T11:09:20.750Z","checks":2,"verdict":"dual-stack","grade":"B","web":"pass","www":"fail","mail":"pass","dns":"pass","secondLook":null}]}