{"kind":"host","input":"assets.oreilly.com","report":{"host":"assets.oreilly.com","checkedAt":"2026-11-01T12:16:31.040Z","a":{"status":"found","values":["23.205.106.83","23.205.106.74"],"ttl":20,"via":"Cloudflare","cname":["subs.oreilly.com.edgekey.net","e83935.dscb.akamaiedge.net"]},"aaaa":{"status":"found","values":["2600:1408:c400:1f::17d4:fbc5","2600:1408:c400:1f::17d4:fbd9"],"ttl":20,"via":"Cloudflare","cname":["subs.oreilly.com.edgekey.net","e83935.dscb.akamaiedge.net"]},"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":"assets.oreilly.com has 2 IPv6 addresses and answers on every one we tested.","addresses":[{"address":"2600:1408:c400:1f::17d4:fbc5","result":"answers","port":443},{"address":"2600:1408:c400:1f::17d4:fbd9","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":"a4-64.akam.net","ipv6":true},{"host":"a13-64.akam.net","ipv6":true},{"host":"a1-225.akam.net","ipv6":true},{"host":"a20-66.akam.net","ipv6":true},{"host":"a16-65.akam.net","ipv6":true},{"host":"a3-67.akam.net","ipv6":true}]}]},"https":{"status":"pass","summary":"Loads over IPv6 with a valid certificate: HTTP 403.","hops":[{"url":"https://assets.oreilly.com/","address":"2600:1408:c400:1f::17d4:fbc5","status":403,"tls":"valid"}]},"receiptId":"b_dWHqPNoD","reused":true,"measuredAt":"2026-11-01T12:16:31.367Z"}