{"kind":"host","input":"anthopic.online","report":{"host":"anthopic.online","checkedAt":"2026-11-13T01:54:08.061Z","a":{"status":"found","values":["104.21.37.33","172.67.203.111"],"ttl":300,"via":"Cloudflare","cname":[]},"aaaa":{"status":"found","values":["2606:4700:3031::6815:2521","2606:4700:3031::ac43:cb6f"],"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":"anthopic.online has 2 IPv6 addresses and answers on every one we tested.","addresses":[{"address":"2606:4700:3031::6815:2521","result":"answers","port":443},{"address":"2606:4700:3031::ac43:cb6f","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":"mail.anthopic.online","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":"rosa.ns.cloudflare.com","ipv6":true},{"host":"uriah.ns.cloudflare.com","ipv6":true}]}]},"https":{"status":"unknown","summary":"Answered over IPv6 with a server error (HTTP 525) — can't tell whether that's specific to IPv6.","hops":[{"url":"https://anthopic.online/","address":"2606:4700:3031::6815:2521","status":525,"tls":"valid"}]},"receiptId":"UzhPI4E6T2","reused":true,"measuredAt":"2026-11-13T01:54:08.354Z"}