{"domain":"colorado.edu","result":true,"measuredAt":"2026-11-02T17:38:34.516Z","receiptId":"vYsJej_Htr","answer":{"kind":"host","input":"colorado.edu","report":{"host":"colorado.edu","checkedAt":"2026-11-02T17:38:34.386Z","a":{"status":"found","values":["151.101.130.133","151.101.2.133","151.101.194.133","151.101.66.133"],"ttl":3591,"via":"Cloudflare","cname":[]},"aaaa":{"status":"found","values":["2a04:4e42::645","2a04:4e42:600::645","2a04:4e42:400::645","2a04:4e42:200::645"],"ttl":3182,"via":"Cloudflare","cname":[]},"verdict":"dual-stack","www":{"host":"www.colorado.edu","a":{"status":"found","values":["151.101.2.133","151.101.66.133","151.101.130.133","151.101.194.133"],"ttl":59,"via":"Cloudflare","cname":["pantheon-systems.map.fastly.net"]},"aaaa":{"status":"found","values":["2a04:4e42::645","2a04:4e42:200::645","2a04:4e42:400::645","2a04:4e42:600::645"],"ttl":60,"via":"Cloudflare","cname":["pantheon-systems.map.fastly.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":"colorado.edu has 4 IPv6 addresses and answers on every one we tested.","addresses":[{"address":"2a04:4e42::645","result":"answers","port":443},{"address":"2a04:4e42:600::645","result":"answers","port":443},{"address":"2a04:4e42:400::645","result":"answers","port":443},{"address":"2a04:4e42:200::645","result":"answers","port":443}]},{"key":"www","label":"www over IPv6","status":"pass","detail":"www.colorado.edu has 4 IPv6 addresses and answers on every one we tested.","addresses":[{"address":"2a04:4e42::645","result":"answers","port":443},{"address":"2a04:4e42:200::645","result":"answers","port":443},{"address":"2a04:4e42:400::645","result":"answers","port":443},{"address":"2a04:4e42:600::645","result":"answers","port":443}]},{"key":"mail","label":"Mail servers (MX) have IPv6","status":"pass","detail":"Every mail server has an AAAA record.","hosts":[{"host":"colorado-edu.mail.protection.outlook.com","ipv6":true}]},{"key":"dns","label":"Nameservers have IPv6","status":"pass","detail":"6 of 6 nameservers checked have an AAAA record, so IPv6-only resolvers can look the domain up.","hosts":[{"host":"a1-153.akam.net","ipv6":true},{"host":"a3-66.akam.net","ipv6":true},{"host":"a22-67.akam.net","ipv6":true},{"host":"a20-65.akam.net","ipv6":true},{"host":"a11-66.akam.net","ipv6":true},{"host":"a2-67.akam.net","ipv6":true}]}]},"https":{"status":"pass","summary":"Loads over IPv6 with a valid certificate after 1 redirect: HTTP 200.","hops":[{"url":"https://colorado.edu/","address":"2a04:4e42::645","status":301,"tls":"valid"},{"url":"https://www.colorado.edu/","address":"2a04:4e42::645","status":200,"tls":"valid"}]}},"states":[{"firstSeen":"2026-11-02T00:04:58.309Z","lastConfirmed":"2026-11-02T17:38:34.516Z","checks":3,"verdict":"dual-stack","grade":"A","web":"pass","www":"pass","mail":"pass","dns":"pass","secondLook":null}]}