{"kind":"host","input":"cdn.constantcontact.com","report":{"host":"cdn.constantcontact.com","checkedAt":"2026-11-02T09:57:17.055Z","a":{"status":"found","values":["3.167.99.104","3.167.99.121","3.167.99.11","3.167.99.105"],"ttl":60,"via":"Cloudflare","cname":["d3ia13pvjpp24b.cloudfront.net"]},"aaaa":{"status":"found","values":["2600:9000:27ce:600:e:7aba:fec0:93a1","2600:9000:27ce:e600:e:7aba:fec0:93a1","2600:9000:27ce:4400:e:7aba:fec0:93a1","2600:9000:27ce:f600:e:7aba:fec0:93a1","2600:9000:27ce:2e00:e:7aba:fec0:93a1","2600:9000:27ce:3a00:e:7aba:fec0:93a1","2600:9000:27ce:e200:e:7aba:fec0:93a1","2600:9000:27ce:4000:e:7aba:fec0:93a1"],"ttl":60,"via":"Cloudflare","cname":["d3ia13pvjpp24b.cloudfront.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":"cdn.constantcontact.com has 4 IPv6 addresses and answers on every one we tested (4 more not tested).","addresses":[{"address":"2600:9000:27ce:600:e:7aba:fec0:93a1","result":"answers","port":443},{"address":"2600:9000:27ce:e600:e:7aba:fec0:93a1","result":"answers","port":443},{"address":"2600:9000:27ce:4400:e:7aba:fec0:93a1","result":"answers","port":443},{"address":"2600:9000:27ce:f600:e:7aba:fec0:93a1","result":"answers","port":443},{"address":"2600:9000:27ce:2e00:e:7aba:fec0:93a1","result":"not tested"},{"address":"2600:9000:27ce:3a00:e:7aba:fec0:93a1","result":"not tested"},{"address":"2600:9000:27ce:e200:e:7aba:fec0:93a1","result":"not tested"},{"address":"2600:9000:27ce:4000:e:7aba:fec0:93a1","result":"not tested"}]},{"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":"4 of 4 nameservers checked have an AAAA record, so IPv6-only resolvers can look the domain up.","hosts":[{"host":"dns1.p01.nsone.net","ipv6":true},{"host":"dns2.p01.nsone.net","ipv6":true},{"host":"dns3.p01.nsone.net","ipv6":true},{"host":"dns4.p01.nsone.net","ipv6":true}]}]},"https":{"status":"pass","summary":"Loads over IPv6 with a valid certificate: HTTP 403.","hops":[{"url":"https://cdn.constantcontact.com/","address":"2600:9000:27ce:600:e:7aba:fec0:93a1","status":403,"tls":"valid"}]},"receiptId":"4aHpo2noC6","reused":true,"measuredAt":"2026-11-02T09:57:17.118Z"}