{"kind":"host","input":"scientificamerican.com","report":{"host":"scientificamerican.com","checkedAt":"2026-10-31T22:29:15.195Z","a":{"status":"found","values":["3.171.38.37","3.171.38.86","3.171.38.114","3.171.38.19"],"ttl":60,"via":"Cloudflare","cname":[]},"aaaa":{"status":"found","values":["2600:9000:28a0:800:12:7409:4340:93a1","2600:9000:28a0:6000:12:7409:4340:93a1","2600:9000:28a0:6c00:12:7409:4340:93a1","2600:9000:28a0:a400:12:7409:4340:93a1","2600:9000:28a0:8600:12:7409:4340:93a1","2600:9000:28a0:ee00:12:7409:4340:93a1","2600:9000:28a0:d200:12:7409:4340:93a1","2600:9000:28a0:e00:12:7409:4340:93a1"],"ttl":60,"via":"Cloudflare","cname":[]},"verdict":"dual-stack","www":{"host":"www.scientificamerican.com","a":{"status":"found","values":["3.171.38.19","3.171.38.86","3.171.38.114","3.171.38.37"],"ttl":24,"via":"Cloudflare","cname":[]},"aaaa":{"status":"found","values":["2600:9000:28a0:3e00:12:7409:4340:93a1","2600:9000:28a0:e000:12:7409:4340:93a1","2600:9000:28a0:9c00:12:7409:4340:93a1","2600:9000:28a0:3200:12:7409:4340:93a1","2600:9000:28a0:7c00:12:7409:4340:93a1","2600:9000:28a0:2200:12:7409:4340:93a1","2600:9000:28a0:6c00:12:7409:4340:93a1","2600:9000:28a0:3600:12:7409:4340:93a1"],"ttl":60,"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":"scientificamerican.com has 4 IPv6 addresses and answers on every one we tested (4 more not tested).","addresses":[{"address":"2600:9000:28a0:800:12:7409:4340:93a1","result":"answers","port":443},{"address":"2600:9000:28a0:6000:12:7409:4340:93a1","result":"answers","port":443},{"address":"2600:9000:28a0:6c00:12:7409:4340:93a1","result":"answers","port":443},{"address":"2600:9000:28a0:a400:12:7409:4340:93a1","result":"answers","port":443},{"address":"2600:9000:28a0:8600:12:7409:4340:93a1","result":"not tested"},{"address":"2600:9000:28a0:ee00:12:7409:4340:93a1","result":"not tested"},{"address":"2600:9000:28a0:d200:12:7409:4340:93a1","result":"not tested"},{"address":"2600:9000:28a0:e00:12:7409:4340:93a1","result":"not tested"}]},{"key":"www","label":"www over IPv6","status":"pass","detail":"www.scientificamerican.com has 4 IPv6 addresses and answers on every one we tested (4 more not tested).","addresses":[{"address":"2600:9000:28a0:3e00:12:7409:4340:93a1","result":"answers","port":443},{"address":"2600:9000:28a0:e000:12:7409:4340:93a1","result":"answers","port":443},{"address":"2600:9000:28a0:9c00:12:7409:4340:93a1","result":"answers","port":443},{"address":"2600:9000:28a0:3200:12:7409:4340:93a1","result":"answers","port":443},{"address":"2600:9000:28a0:7c00:12:7409:4340:93a1","result":"not tested"},{"address":"2600:9000:28a0:2200:12:7409:4340:93a1","result":"not tested"},{"address":"2600:9000:28a0:6c00:12:7409:4340:93a1","result":"not tested"},{"address":"2600:9000:28a0:3600:12:7409:4340:93a1","result":"not tested"}]},{"key":"mail","label":"Mail servers (MX) have IPv6","status":"fail","detail":"None of the mail servers has an AAAA record.","hosts":[{"host":"null.scientificamerican.com","ipv6":false}]},{"key":"dns","label":"Nameservers have IPv6","status":"pass","detail":"4 of 4 nameservers checked have an AAAA record, so IPv6-only resolvers can look the domain up.","hosts":[{"host":"ns-1137.awsdns-14.org","ipv6":true},{"host":"ns-1733.awsdns-24.co.uk","ipv6":true},{"host":"ns-265.awsdns-33.com","ipv6":true},{"host":"ns-918.awsdns-50.net","ipv6":true}]}]},"https":{"status":"pass","summary":"Loads over IPv6 with a valid certificate after 1 redirect: HTTP 200.","hops":[{"url":"https://scientificamerican.com/","address":"2600:9000:28a0:800:12:7409:4340:93a1","status":301,"tls":"valid"},{"url":"https://www.scientificamerican.com/","address":"2600:9000:28a0:3e00:12:7409:4340:93a1","status":200,"tls":"valid"}]},"receiptId":"07zLj-0I02","reused":true,"measuredAt":"2026-10-31T22:29:15.244Z"}