{"kind":"host","input":"smtp.vanderbilt.edu","report":{"host":"smtp.vanderbilt.edu","checkedAt":"2026-11-03T09:18:47.765Z","a":{"status":"found","values":["129.59.15.79"],"ttl":300,"via":"Cloudflare","cname":[]},"aaaa":{"status":"absent","via":"Cloudflare","cname":[]},"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.vanderbilt.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":"fail","detail":"No nameserver has an AAAA record — an IPv6-only resolver can't reach this domain's DNS.","hosts":[{"host":"ns2.vanderbilt.edu","ipv6":false},{"host":"ns4.vanderbilt.edu","ipv6":false},{"host":"ns3.vanderbilt.edu","ipv6":false},{"host":"ns1.vanderbilt.edu","ipv6":false}]}]},"receiptId":"puo3ee9UG4","reused":true,"measuredAt":"2026-11-03T09:18:47.793Z"}