{"kind":"host","input":"customer.io","report":{"host":"customer.io","checkedAt":"2026-11-01T18:22:16.631Z","a":{"status":"found","values":["76.76.21.21"],"ttl":60,"via":"Cloudflare","cname":[]},"aaaa":{"status":"absent","via":"Cloudflare","cname":[]},"verdict":"ipv4-only","www":{"host":"www.customer.io","a":{"status":"found","values":["76.76.21.123","66.33.60.35"],"ttl":60,"via":"Cloudflare","cname":["cname.vercel-dns.com"]},"aaaa":{"status":"absent","via":"Cloudflare","cname":["cname.vercel-dns.com"]},"verdict":"ipv4-only"}},"readiness":{"grade":"D","summary":"The website has no IPv6.","reachabilityTested":true,"checks":[{"key":"web","label":"Website over IPv6","status":"fail","detail":"customer.io has no AAAA record."},{"key":"www","label":"www over IPv6","status":"fail","detail":"www.customer.io has no AAAA record."},{"key":"mail","label":"Mail servers (MX) have IPv6","status":"pass","detail":"Every mail server has an AAAA record.","hosts":[{"host":"aspmx.l.google.com","ipv6":true},{"host":"aspmx2.googlemail.com","ipv6":true},{"host":"aspmx3.googlemail.com","ipv6":true},{"host":"alt1.aspmx.l.google.com","ipv6":true},{"host":"alt2.aspmx.l.google.com","ipv6":true}]},{"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-1181.awsdns-19.org","ipv6":true},{"host":"ns-1893.awsdns-44.co.uk","ipv6":true},{"host":"ns-499.awsdns-62.com","ipv6":true},{"host":"ns-618.awsdns-13.net","ipv6":true}]}]},"receiptId":"Fq-NZStL-A","reused":true,"measuredAt":"2026-11-01T18:22:16.657Z"}