{"kind":"host","input":"sandbox.umd.edu","report":{"host":"sandbox.umd.edu","checkedAt":"2026-11-02T19:10:43.926Z","a":{"status":"found","values":["128.8.120.240"],"ttl":3600,"via":"Cloudflare","cname":[]},"aaaa":{"status":"absent","via":"Cloudflare","cname":[]},"verdict":"ipv4-only","www":{"host":"www.sandbox.umd.edu","a":{"status":"found","values":["192.178.155.121"],"ttl":300,"via":"Cloudflare","cname":["ghs.googlehosted.com"]},"aaaa":{"status":"found","values":["2607:f8b0:4004:c23::79"],"ttl":300,"via":"Cloudflare","cname":["ghs.googlehosted.com"]},"verdict":"dual-stack"}},"readiness":{"grade":"D","summary":"The website has no IPv6.","reachabilityTested":true,"checks":[{"key":"web","label":"Website over IPv6","status":"fail","detail":"sandbox.umd.edu has no AAAA record."},{"key":"www","label":"www over IPv6","status":"pass","detail":"www.sandbox.umd.edu has an AAAA record and answers on it.","addresses":[{"address":"2607:f8b0:4004:c23::79","result":"answers","port":443}]},{"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":"dnskrb3.umiacs.umd.edu","ipv6":false},{"host":"urchin.umiacs.umd.edu","ipv6":false},{"host":"whizbang.umiacs.umd.edu","ipv6":false},{"host":"smog.umiacs.umd.edu","ipv6":false}]}]},"receiptId":"AUtWHCKvcv","reused":true,"measuredAt":"2026-11-02T19:10:43.970Z"}