{"kind":"host","input":"smtp.colorado.edu","report":{"host":"smtp.colorado.edu","checkedAt":"2026-11-03T02:18:08.657Z","a":{"status":"found","values":["128.138.129.81"],"ttl":30,"via":"Cloudflare","cname":["smtp.gtm.colorado.edu"]},"aaaa":{"status":"absent","via":"Cloudflare","cname":["smtp.gtm.colorado.edu"]},"verdict":"ipv4-only"},"readiness":{"grade":"D","summary":"The website has no IPv6.","reachabilityTested":true,"checks":[{"key":"web","label":"Website over IPv6","status":"fail","detail":"smtp.colorado.edu has no AAAA record."},{"key":"mail","label":"Mail servers (MX) have IPv6","status":"fail","detail":"No MX records, so mail goes to the domain's own address (implicit MX). It has no AAAA record."},{"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":"a11-66.akam.net","ipv6":true},{"host":"a1-153.akam.net","ipv6":true},{"host":"a3-66.akam.net","ipv6":true},{"host":"a20-65.akam.net","ipv6":true},{"host":"a22-67.akam.net","ipv6":true},{"host":"a2-67.akam.net","ipv6":true}]}]},"receiptId":"HpIyFz90rp","reused":true,"measuredAt":"2026-11-03T02:18:08.736Z"}