{"kind":"host","input":"xfinity.com","report":{"host":"xfinity.com","checkedAt":"2026-10-31T19:43:54.951Z","a":{"status":"found","values":["96.99.240.155"],"ttl":46,"via":"Cloudflare","cname":[]},"aaaa":{"status":"found","values":["2001:558:feed:dc:96:99:240:155"],"ttl":277,"via":"Cloudflare","cname":[]},"verdict":"dual-stack","www":{"host":"www.xfinity.com","a":{"status":"found","values":["23.13.173.231"],"ttl":1,"via":"Cloudflare","cname":["www.xfinity.com.edgekey.net","e10994.dscx.akamaiedge.net"]},"aaaa":{"status":"found","values":["2600:1408:c400:1881::2af2","2600:1408:c400:1884::2af2","2600:1408:c400:188b::2af2","2600:1408:c400:1887::2af2","2600:1408:c400:1880::2af2"],"ttl":11,"via":"Cloudflare","cname":["www.xfinity.com.edgekey.net","e10994.dscx.akamaiedge.net"]},"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":"xfinity.com has an AAAA record and answers on it.","addresses":[{"address":"2001:558:feed:dc:96:99:240:155","result":"answers","port":443}]},{"key":"www","label":"www over IPv6","status":"pass","detail":"www.xfinity.com has 4 IPv6 addresses and answers on every one we tested (1 more not tested).","addresses":[{"address":"2600:1408:c400:1881::2af2","result":"answers","port":443},{"address":"2600:1408:c400:1884::2af2","result":"answers","port":443},{"address":"2600:1408:c400:188b::2af2","result":"answers","port":443},{"address":"2600:1408:c400:1887::2af2","result":"answers","port":443},{"address":"2600:1408:c400:1880::2af2","result":"not tested"}]},{"key":"mail","label":"Mail servers (MX) have IPv6","status":"fail","detail":"None of the mail servers has an AAAA record.","hosts":[{"host":"mx1a1.comcast.net","ipv6":false},{"host":"mx1c1.comcast.net","ipv6":false},{"host":"mx1h1.comcast.net","ipv6":false},{"host":"mx2a1.comcast.net","ipv6":false},{"host":"mx2c1.comcast.net","ipv6":false},{"host":"mx2h1.comcast.net","ipv6":false}]},{"key":"dns","label":"Nameservers have IPv6","status":"pass","detail":"5 of 5 nameservers checked have an AAAA record, so IPv6-only resolvers can look the domain up.","hosts":[{"host":"dns101.comcast.net","ipv6":true},{"host":"dns102.comcast.net","ipv6":true},{"host":"dns103.comcast.net","ipv6":true},{"host":"dns104.comcast.net","ipv6":true},{"host":"dns105.comcast.net","ipv6":true}]}]},"https":{"status":"pass","summary":"Loads over IPv6 with a valid certificate after 1 redirect: HTTP 403.","hops":[{"url":"https://xfinity.com/","address":"2001:558:feed:dc:96:99:240:155","status":301,"tls":"valid"},{"url":"https://www.xfinity.com/","address":"2600:1408:c400:1881::2af2","status":403,"tls":"valid"}]},"receiptId":"Hq0s2RNhY0"}