{"kind":"host","input":"cdn.vanderbilt.edu","report":{"host":"cdn.vanderbilt.edu","checkedAt":"2026-11-03T09:59:08.294Z","a":{"status":"found","values":["3.170.19.44","3.170.19.10","3.170.19.83","3.170.19.23"],"ttl":60,"via":"Cloudflare","cname":[]},"aaaa":{"status":"found","values":["2600:9000:286d:da00:f:d06e:ff00:93a1","2600:9000:286d:4a00:f:d06e:ff00:93a1","2600:9000:286d:f000:f:d06e:ff00:93a1","2600:9000:286d:8400:f:d06e:ff00:93a1","2600:9000:286d:8a00:f:d06e:ff00:93a1","2600:9000:286d:e200:f:d06e:ff00:93a1","2600:9000:286d:9e00:f:d06e:ff00:93a1","2600:9000:286d:dc00:f:d06e:ff00:93a1"],"ttl":60,"via":"Cloudflare","cname":[]},"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.vanderbilt.edu has 4 IPv6 addresses and answers on every one we tested (4 more not tested).","addresses":[{"address":"2600:9000:286d:da00:f:d06e:ff00:93a1","result":"answers","port":443},{"address":"2600:9000:286d:4a00:f:d06e:ff00:93a1","result":"answers","port":443},{"address":"2600:9000:286d:f000:f:d06e:ff00:93a1","result":"answers","port":443},{"address":"2600:9000:286d:8400:f:d06e:ff00:93a1","result":"answers","port":443},{"address":"2600:9000:286d:8a00:f:d06e:ff00:93a1","result":"not tested"},{"address":"2600:9000:286d:e200:f:d06e:ff00:93a1","result":"not tested"},{"address":"2600:9000:286d:9e00:f:d06e:ff00:93a1","result":"not tested"},{"address":"2600:9000:286d:dc00:f:d06e:ff00:93a1","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":"ns-1190.awsdns-20.org","ipv6":true},{"host":"ns-1811.awsdns-34.co.uk","ipv6":true},{"host":"ns-260.awsdns-32.com","ipv6":true},{"host":"ns-914.awsdns-50.net","ipv6":true}]}]},"https":{"status":"pass","summary":"Loads over IPv6 with a valid certificate: HTTP 404.","hops":[{"url":"https://cdn.vanderbilt.edu/","address":"2600:9000:286d:da00:f:d06e:ff00:93a1","status":404,"tls":"valid"}]},"receiptId":"abNmmdZMFv","reused":true,"measuredAt":"2026-11-03T09:59:08.354Z"}