{"kind":"host","input":"email.posthog.com","report":{"host":"email.posthog.com","checkedAt":"2026-11-01T23:05:36.629Z","a":{"status":"found","values":["13.226.209.108","13.226.209.77","13.226.209.82","13.226.209.74"],"ttl":60,"via":"Cloudflare","cname":["d6o9p0tbz3txx.cloudfront.net"]},"aaaa":{"status":"found","values":["2600:9000:201d:2400:14:1aa6:5540:93a1","2600:9000:201d:6400:14:1aa6:5540:93a1","2600:9000:201d:c600:14:1aa6:5540:93a1","2600:9000:201d:e600:14:1aa6:5540:93a1","2600:9000:201d:b400:14:1aa6:5540:93a1","2600:9000:201d:c000:14:1aa6:5540:93a1","2600:9000:201d:9c00:14:1aa6:5540:93a1","2600:9000:201d:9800:14:1aa6:5540:93a1"],"ttl":60,"via":"Cloudflare","cname":["d6o9p0tbz3txx.cloudfront.net"]},"verdict":"dual-stack","www":{"host":"www.email.posthog.com","a":{"status":"absent","via":"Cloudflare","cname":[]},"aaaa":{"status":"absent","via":"Cloudflare","cname":[]},"verdict":"no-address"}},"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":"email.posthog.com has 4 IPv6 addresses and answers on every one we tested (4 more not tested).","addresses":[{"address":"2600:9000:201d:2400:14:1aa6:5540:93a1","result":"answers","port":443},{"address":"2600:9000:201d:6400:14:1aa6:5540:93a1","result":"answers","port":443},{"address":"2600:9000:201d:c600:14:1aa6:5540:93a1","result":"answers","port":443},{"address":"2600:9000:201d:e600:14:1aa6:5540:93a1","result":"answers","port":443},{"address":"2600:9000:201d:b400:14:1aa6:5540:93a1","result":"not tested"},{"address":"2600:9000:201d:c000:14:1aa6:5540:93a1","result":"not tested"},{"address":"2600:9000:201d:9c00:14:1aa6:5540:93a1","result":"not tested"},{"address":"2600:9000:201d:9800:14:1aa6:5540:93a1","result":"not tested"}]},{"key":"www","label":"www over IPv6","status":"fail","detail":"www.email.posthog.com 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":"2 of 2 nameservers checked have an AAAA record, so IPv6-only resolvers can look the domain up.","hosts":[{"host":"rory.ns.cloudflare.com","ipv6":true},{"host":"julissa.ns.cloudflare.com","ipv6":true}]}]},"https":{"status":"pass","summary":"Loads over IPv6 with a valid certificate: HTTP 404.","hops":[{"url":"https://email.posthog.com/","address":"2600:9000:201d:2400:14:1aa6:5540:93a1","status":404,"tls":"valid"}]},"receiptId":"kVJnpIRRSb","reused":true,"measuredAt":"2026-11-01T23:05:36.764Z"}