{"kind":"host","input":"rubiconproject.com","report":{"host":"rubiconproject.com","checkedAt":"2026-10-31T04:45:16.853Z","a":{"status":"found","values":["3.170.3.28","3.170.3.81","3.170.3.16","3.170.3.15"],"ttl":60,"via":"Cloudflare","cname":[]},"aaaa":{"status":"found","values":["2600:9000:286a:e600:19:133b:2800:93a1","2600:9000:286a:c400:19:133b:2800:93a1","2600:9000:286a:5c00:19:133b:2800:93a1","2600:9000:286a:6600:19:133b:2800:93a1","2600:9000:286a:1600:19:133b:2800:93a1","2600:9000:286a:400:19:133b:2800:93a1","2600:9000:286a:3c00:19:133b:2800:93a1","2600:9000:286a:4e00:19:133b:2800:93a1"],"ttl":60,"via":"Cloudflare","cname":[]},"verdict":"dual-stack","www":{"host":"www.rubiconproject.com","a":{"status":"found","values":["141.193.213.20","141.193.213.21"],"ttl":300,"via":"Cloudflare","cname":["1y0y7y9io391.wpeproxy.com"]},"aaaa":{"status":"absent","via":"Cloudflare","cname":["1y0y7y9io391.wpeproxy.com"]},"verdict":"ipv4-only"}},"readiness":{"grade":"B","summary":"Works over IPv6, with one gap: www doesn't fully work over IPv6.","reachabilityTested":true,"checks":[{"key":"web","label":"Website over IPv6","status":"pass","detail":"rubiconproject.com has 4 IPv6 addresses and answers on every one we tested (4 more not tested).","addresses":[{"address":"2600:9000:286a:e600:19:133b:2800:93a1","result":"answers","port":443},{"address":"2600:9000:286a:c400:19:133b:2800:93a1","result":"answers","port":443},{"address":"2600:9000:286a:5c00:19:133b:2800:93a1","result":"answers","port":443},{"address":"2600:9000:286a:6600:19:133b:2800:93a1","result":"answers","port":443},{"address":"2600:9000:286a:1600:19:133b:2800:93a1","result":"not tested"},{"address":"2600:9000:286a:400:19:133b:2800:93a1","result":"not tested"},{"address":"2600:9000:286a:3c00:19:133b:2800:93a1","result":"not tested"},{"address":"2600:9000:286a:4e00:19:133b:2800:93a1","result":"not tested"}]},{"key":"www","label":"www over IPv6","status":"fail","detail":"www.rubiconproject.com has no AAAA record."},{"key":"mail","label":"Mail servers (MX) have IPv6","status":"pass","detail":"Every mail server has an AAAA record.","hosts":[{"host":"aspmx.l.google.com","ipv6":true},{"host":"aspmx2.googlemail.com","ipv6":true},{"host":"aspmx3.googlemail.com","ipv6":true},{"host":"alt1.aspmx.l.google.com","ipv6":true},{"host":"alt2.aspmx.l.google.com","ipv6":true}]},{"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-1150.awsdns-15.org","ipv6":true},{"host":"ns-1722.awsdns-23.co.uk","ipv6":true},{"host":"ns-483.awsdns-60.com","ipv6":true},{"host":"ns-644.awsdns-16.net","ipv6":true}]}]},"https":{"status":"fail","problem":"redirect-no-ipv6","summary":"Redirects to www.rubiconproject.com, which has no IPv6 address — so IPv6 visitors end up needing IPv4 after all.","hops":[{"url":"https://rubiconproject.com/","address":"2600:9000:286a:e600:19:133b:2800:93a1","status":301,"tls":"valid"},{"url":"https://www.rubiconproject.com/","note":"redirects to www.rubiconproject.com, which has no IPv6 address"}]},"receiptId":"GgnsqkdCP1"}