{"kind":"host","input":"mail.oreilly.com","report":{"host":"mail.oreilly.com","checkedAt":"2026-11-01T10:31:54.794Z","a":{"status":"found","values":["142.251.163.121"],"ttl":300,"via":"Cloudflare","cname":["ghs.googlehosted.com"]},"aaaa":{"status":"found","values":["2607:f8b0:4004:c08::79"],"ttl":300,"via":"Cloudflare","cname":["ghs.googlehosted.com"]},"verdict":"dual-stack"},"readiness":{"grade":"A","summary":"Website, mail and DNS all work over IPv6.","reachabilityTested":true,"checks":[{"key":"web","label":"Website over IPv6","status":"pass","detail":"mail.oreilly.com has an AAAA record and answers on it.","addresses":[{"address":"2607:f8b0:4004:c08::79","result":"answers","port":443}]},{"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":"6 of 6 nameservers checked have an AAAA record, so IPv6-only resolvers can look the domain up.","hosts":[{"host":"a20-66.akam.net","ipv6":true},{"host":"a16-65.akam.net","ipv6":true},{"host":"a13-64.akam.net","ipv6":true},{"host":"a1-225.akam.net","ipv6":true},{"host":"a4-64.akam.net","ipv6":true},{"host":"a3-67.akam.net","ipv6":true}]}]},"https":{"status":"unknown","summary":"mail.oreilly.com didn't complete an HTTPS request over IPv6 (connection closed before a response).","hops":[{"url":"https://mail.oreilly.com/","address":"2607:f8b0:4004:c08::79","note":"connection closed before a response"}]},"receiptId":"OSd81jeFKi","reused":true,"measuredAt":"2026-11-01T10:31:54.910Z"}