{"kind":"host","input":"mdpi.com","report":{"host":"mdpi.com","checkedAt":"2026-10-31T11:50:56.287Z","a":{"status":"found","values":["23.212.251.217","23.212.251.198"],"ttl":20,"via":"Cloudflare","cname":[]},"aaaa":{"status":"found","values":["2600:1408:c400:1f::17d4:fbd9","2600:1408:c400:1f::17d4:fbc6"],"ttl":15,"via":"Cloudflare","cname":[]},"verdict":"dual-stack","www":{"host":"www.mdpi.com","a":{"status":"found","values":["23.212.251.217","23.212.251.198"],"ttl":4,"via":"Cloudflare","cname":["www.mdpi.com.edgekey.net","e316778.dscb.akamaiedge.net"]},"aaaa":{"status":"found","values":["2600:1408:c400:1f::17d4:fbd9","2600:1408:c400:1f::17d4:fbc6"],"ttl":20,"via":"Cloudflare","cname":["www.mdpi.com.edgekey.net","e316778.dscb.akamaiedge.net"]},"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":"mdpi.com has 2 IPv6 addresses and answers on every one we tested.","addresses":[{"address":"2600:1408:c400:1f::17d4:fbd9","result":"answers","port":443},{"address":"2600:1408:c400:1f::17d4:fbc6","result":"answers","port":443}]},{"key":"www","label":"www over IPv6","status":"pass","detail":"www.mdpi.com has 2 IPv6 addresses and answers on every one we tested.","addresses":[{"address":"2600:1408:c400:1f::17d4:fbd9","result":"answers","port":443},{"address":"2600:1408:c400:1f::17d4:fbc6","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.mdpi.com","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":"duke.ns.cloudflare.com","ipv6":true},{"host":"tia.ns.cloudflare.com","ipv6":true}]}]},"https":{"status":"pass","summary":"Loads over IPv6 with a valid certificate: HTTP 403.","hops":[{"url":"https://mdpi.com/","address":"2600:1408:c400:1f::17d4:fbd9","status":403,"tls":"valid"}]},"receiptId":"zzD9Ydz8oh"}