{"kind":"host","input":"upenn.edu","report":{"host":"upenn.edu","checkedAt":"2026-11-02T16:56:29.473Z","a":{"status":"found","values":["23.185.0.4"],"ttl":81397,"via":"Cloudflare","cname":[]},"aaaa":{"status":"found","values":["2620:12a:8001::4","2620:12a:8000::4"],"ttl":85513,"via":"Cloudflare","cname":[]},"verdict":"dual-stack","www":{"host":"www.upenn.edu","a":{"status":"found","values":["23.185.0.4"],"ttl":85266,"via":"Cloudflare","cname":[]},"aaaa":{"status":"found","values":["2620:12a:8000::4","2620:12a:8001::4"],"ttl":77285,"via":"Cloudflare","cname":[]},"verdict":"dual-stack"}},"readiness":{"grade":"B","summary":"Works over IPv6, with one gap: its mail servers lack IPv6.","reachabilityTested":true,"checks":[{"key":"web","label":"Website over IPv6","status":"pass","detail":"upenn.edu has 2 IPv6 addresses and answers on every one we tested.","addresses":[{"address":"2620:12a:8001::4","result":"answers","port":443},{"address":"2620:12a:8000::4","result":"answers","port":443}]},{"key":"www","label":"www over IPv6","status":"pass","detail":"www.upenn.edu has 2 IPv6 addresses and answers on every one we tested.","addresses":[{"address":"2620:12a:8000::4","result":"answers","port":443},{"address":"2620:12a:8001::4","result":"answers","port":443}]},{"key":"mail","label":"Mail servers (MX) have IPv6","status":"fail","detail":"None of the mail servers has an AAAA record.","hosts":[{"host":"mxa-00390e01.gslb.pphosted.com","ipv6":false},{"host":"mxb-00390e01.gslb.pphosted.com","ipv6":false}]},{"key":"dns","label":"Nameservers have IPv6","status":"pass","detail":"6 of 8 nameservers checked have an AAAA record, so IPv6-only resolvers can look the domain up.","hosts":[{"host":"dns1.udel.edu","ipv6":false},{"host":"dns2.udel.edu","ipv6":false},{"host":"adns1.nnn.upenn.edu","ipv6":true},{"host":"adns2.nnn.upenn.edu","ipv6":true},{"host":"adns3.nnn.upenn.edu","ipv6":true},{"host":"adns4.upenn.edu","ipv6":true},{"host":"adns5.upenn.edu","ipv6":true},{"host":"adns6.upenn.edu","ipv6":true}]}]},"https":{"status":"pass","summary":"Loads over IPv6 with a valid certificate after 1 redirect: HTTP 200.","hops":[{"url":"https://upenn.edu/","address":"2620:12a:8001::4","status":301,"tls":"valid"},{"url":"https://www.upenn.edu/","address":"2620:12a:8000::4","status":200,"tls":"valid"}]},"receiptId":"1VlLidWazD","reused":true,"measuredAt":"2026-11-02T16:56:30.300Z"}