{"kind":"host","input":"britannica.com","report":{"host":"britannica.com","checkedAt":"2026-10-31T14:24:48.298Z","a":{"status":"found","values":["34.238.87.25","100.57.27.235"],"ttl":60,"via":"Cloudflare","cname":[]},"aaaa":{"status":"absent","via":"Cloudflare","cname":[]},"verdict":"ipv4-only","www":{"host":"www.britannica.com","a":{"status":"found","values":["104.18.4.110","104.18.5.110"],"ttl":60,"via":"Cloudflare","cname":["www.britannica.com.cdn.cloudflare.net"]},"aaaa":{"status":"absent","via":"Cloudflare","cname":["www.britannica.com.cdn.cloudflare.net"]},"verdict":"ipv4-only"}},"readiness":{"grade":"D","summary":"The website has no IPv6.","reachabilityTested":true,"checks":[{"key":"web","label":"Website over IPv6","status":"fail","detail":"britannica.com has no AAAA record."},{"key":"www","label":"www over IPv6","status":"fail","detail":"www.britannica.com has no AAAA record."},{"key":"mail","label":"Mail servers (MX) have IPv6","status":"fail","detail":"No MX records, so mail goes to the domain's own address (implicit MX). It has no AAAA record."},{"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-1050.awsdns-03.org","ipv6":true},{"host":"ns-1567.awsdns-03.co.uk","ipv6":true},{"host":"ns-243.awsdns-30.com","ipv6":true},{"host":"ns-829.awsdns-39.net","ipv6":true}]}]},"receiptId":"E34j3aXRx7"}