{ "ok": true, "domain": "cuhk.edu.hk", "generated_at": "2026-08-09T00:15:26-05:00", "cache": { "hit": true, "ttl": 0 }, "score": { "total": 74, "label": "Fair", "categories": { "dns": 70, "mail": 90, "security": 65, "network": 20, "availability": 100 }, "category_weights": { "dns": 25, "mail": 20, "security": 25, "network": 10, "availability": 20 }, "items": [ { "category": "dns", "title": "IPv4 (A)", "max_points": 30, "earned_points": 30, "lost_points": 0, "detail": "1 IPv4 address(es) detected." }, { "category": "dns", "title": "IPv6 (AAAA)", "max_points": 10, "earned_points": 0, "lost_points": 10, "detail": "0 IPv6 address(es) detected." }, { "category": "dns", "title": "Name server redundancy", "max_points": 20, "earned_points": 20, "lost_points": 0, "detail": "6 NS record(s); 2 or more required." }, { "category": "dns", "title": "SOA record", "max_points": 10, "earned_points": 10, "lost_points": 0, "detail": "Authoritative zone record." }, { "category": "dns", "title": "DNSSEC chain", "max_points": 15, "earned_points": 0, "lost_points": 15, "detail": "Both DS and DNSKEY are required." }, { "category": "dns", "title": "CAA policy", "max_points": 5, "earned_points": 0, "lost_points": 5, "detail": "Certificate authority restriction." }, { "category": "dns", "title": "DNS propagation", "max_points": 10, "earned_points": 10, "lost_points": 0, "detail": "Agreement between public resolvers." }, { "category": "mail", "title": "MX records", "max_points": 20, "earned_points": 20, "lost_points": 0, "detail": "1 MX record(s)." }, { "category": "mail", "title": "SPF", "max_points": 25, "earned_points": 25, "lost_points": 0, "detail": "SPF policy published." }, { "category": "mail", "title": "DMARC", "max_points": 25, "earned_points": 25, "lost_points": 0, "detail": "DMARC policy published." }, { "category": "mail", "title": "DKIM", "max_points": 20, "earned_points": 20, "lost_points": 0, "detail": "A DKIM selector was verified." }, { "category": "mail", "title": "MTA-STS", "max_points": 5, "earned_points": 0, "lost_points": 5, "detail": "Mail transport policy." }, { "category": "mail", "title": "TLS-RPT", "max_points": 5, "earned_points": 0, "lost_points": 5, "detail": "TLS reporting policy." }, { "category": "security", "title": "Valid TLS certificate", "max_points": 55, "earned_points": 55, "lost_points": 0, "detail": "231 day(s) remaining." }, { "category": "security", "title": "Certificate lifetime", "max_points": 10, "earned_points": 10, "lost_points": 0, "detail": "Full points require at least 30 days remaining." }, { "category": "security", "title": "HTTP security headers", "max_points": 35, "earned_points": 0, "lost_points": 35, "detail": "0 of 9 evaluated headers detected." }, { "category": "network", "title": "PTR reverse DNS", "max_points": 30, "earned_points": 0, "lost_points": 30, "detail": "PTR not detected." }, { "category": "network", "title": "IPv4 diversity", "max_points": 35, "earned_points": 20, "lost_points": 15, "detail": "Two or more IPv4 addresses receive full points." }, { "category": "network", "title": "IPv6 connectivity", "max_points": 35, "earned_points": 0, "lost_points": 35, "detail": "AAAA availability." }, { "category": "availability", "title": "DNS resolution", "max_points": 40, "earned_points": 40, "lost_points": 0, "detail": "At least one address family must resolve." }, { "category": "availability", "title": "HTTP response", "max_points": 40, "earned_points": 40, "lost_points": 0, "detail": "HTTP/1.1 200 OK" }, { "category": "availability", "title": "HTTPS final URL", "max_points": 20, "earned_points": 20, "lost_points": 0, "detail": "Final URL uses HTTPS." } ], "methodology": "Each category is normalized to 100. The total is the weighted sum: DNS 25%, Email 20%, Security 25%, Network 10%, Availability 20%.", "diagnostics": [ { "level": "ok", "title": "IPv4 (A)", "detail": "1 IPv4 address(es) detected.", "category": "dns", "max_points": 30, "earned_points": 30, "lost_points": 0 }, { "level": "error", "title": "IPv6 (AAAA)", "detail": "0 IPv6 address(es) detected.", "category": "dns", "max_points": 10, "earned_points": 0, "lost_points": 10 }, { "level": "ok", "title": "Name server redundancy", "detail": "6 NS record(s); 2 or more required.", "category": "dns", "max_points": 20, "earned_points": 20, "lost_points": 0 }, { "level": "ok", "title": "SOA record", "detail": "Authoritative zone record.", "category": "dns", "max_points": 10, "earned_points": 10, "lost_points": 0 }, { "level": "error", "title": "DNSSEC chain", "detail": "Both DS and DNSKEY are required.", "category": "dns", "max_points": 15, "earned_points": 0, "lost_points": 15 }, { "level": "error", "title": "CAA policy", "detail": "Certificate authority restriction.", "category": "dns", "max_points": 5, "earned_points": 0, "lost_points": 5 }, { "level": "ok", "title": "DNS propagation", "detail": "Agreement between public resolvers.", "category": "dns", "max_points": 10, "earned_points": 10, "lost_points": 0 }, { "level": "ok", "title": "MX records", "detail": "1 MX record(s).", "category": "mail", "max_points": 20, "earned_points": 20, "lost_points": 0 }, { "level": "ok", "title": "SPF", "detail": "SPF policy published.", "category": "mail", "max_points": 25, "earned_points": 25, "lost_points": 0 }, { "level": "ok", "title": "DMARC", "detail": "DMARC policy published.", "category": "mail", "max_points": 25, "earned_points": 25, "lost_points": 0 }, { "level": "ok", "title": "DKIM", "detail": "A DKIM selector was verified.", "category": "mail", "max_points": 20, "earned_points": 20, "lost_points": 0 }, { "level": "error", "title": "MTA-STS", "detail": "Mail transport policy.", "category": "mail", "max_points": 5, "earned_points": 0, "lost_points": 5 }, { "level": "error", "title": "TLS-RPT", "detail": "TLS reporting policy.", "category": "mail", "max_points": 5, "earned_points": 0, "lost_points": 5 }, { "level": "ok", "title": "Valid TLS certificate", "detail": "231 day(s) remaining.", "category": "security", "max_points": 55, "earned_points": 55, "lost_points": 0 }, { "level": "ok", "title": "Certificate lifetime", "detail": "Full points require at least 30 days remaining.", "category": "security", "max_points": 10, "earned_points": 10, "lost_points": 0 }, { "level": "error", "title": "HTTP security headers", "detail": "0 of 9 evaluated headers detected.", "category": "security", "max_points": 35, "earned_points": 0, "lost_points": 35 }, { "level": "error", "title": "PTR reverse DNS", "detail": "PTR not detected.", "category": "network", "max_points": 30, "earned_points": 0, "lost_points": 30 }, { "level": "warning", "title": "IPv4 diversity", "detail": "Two or more IPv4 addresses receive full points.", "category": "network", "max_points": 35, "earned_points": 20, "lost_points": 15 }, { "level": "error", "title": "IPv6 connectivity", "detail": "AAAA availability.", "category": "network", "max_points": 35, "earned_points": 0, "lost_points": 35 }, { "level": "ok", "title": "DNS resolution", "detail": "At least one address family must resolve.", "category": "availability", "max_points": 40, "earned_points": 40, "lost_points": 0 }, { "level": "ok", "title": "HTTP response", "detail": "HTTP/1.1 200 OK", "category": "availability", "max_points": 40, "earned_points": 40, "lost_points": 0 }, { "level": "ok", "title": "HTTPS final URL", "detail": "Final URL uses HTTPS.", "category": "availability", "max_points": 20, "earned_points": 20, "lost_points": 0 } ] }, "dns": { "records": { "A": [ "27.126.235.25" ], "AAAA": [], "CNAME": [], "MX": [ "5 cuhk-st.in.tmes.trendmicro.com." ], "TXT": [ "\"h5WA8UpWGJWDLyxQvxpOC9isc0019te/wKy9xGdID77RbUkXS9N0BgPvNtPd2KKg9JMjbG1jIUFrrrrTGKi9DQ==\"", "\"google-site-verification=cGTxUZkK1PBJ2dmfxNmtS9Q3n1XNb2qwvVyQkIrq9CA\"", "\"adobe-idp-site-verification=7fc23f51ce60adec0d8796a683914ba1167fb49fc42d8889fa7416ba4927079c\"", "\"Foxit-domain-verification=7b63330972e6429e349104a11a97ec34\"", "\"v=spf1 include:spf.protection.outlook.com include:spfe.itsc.cuhk.edu.hk include:spftmems.itsc.cuhk.edu.hk ip4:137.189.0.0/16 ip4:123.255.65.0/24 ip6:2405:3000:3::/48 -all\"" ], "NS": [ "dns1.cuhk.edu.hk.", "dns3.cuhk.edu.hk.", "dns2.cuhk.edu.hk.", "ns4.gdnsdef.com.", "anyns.cuhk.edu.hk.", "ns4.gdnsec.com." ], "SOA": [ "ddi-gm1.itsc.cuhk.edu.hk. hostmaster.cuhk.edu.hk. 201704521 600 300 1814400 300" ], "CAA": [], "DS": [], "DNSKEY": [], "RRSIG": [], "NSEC": [], "NSEC3": [], "SRV": [], "NAPTR": [ "50 50 \"s\" \"SIPS+D2T\" \"\" _sips._tcp.cuhk.edu.hk.", "100 50 \"s\" \"SIP+D2U\" \"\" _sip._udp.cuhk.edu.hk.", "90 50 \"s\" \"SIP+D2T\" \"\" _sip._tcp.cuhk.edu.hk." ], "TLSA": [], "SSHFP": [] }, "ipv4": [ "27.126.235.25" ], "ipv6": [] }, "mail": { "spf": "v=spf1 include:spf.protection.outlook.com include:spfe.itsc.cuhk.edu.hk include:spftmems.itsc.cuhk.edu.hk ip4:137.189.0.0/16 ip4:123.255.65.0/24 ip6:2405:3000:3::/48 -all", "dmarc": "v=DMARC1; p=none; rua=mailto:cuhk-st@dmarcrua.tmes.trendmicro.com; adkim=s; aspf=s", "dkim_selector": "selector1", "dkim_host": "selector1._domainkey.cuhk.edu.hk", "dkim": "v=DKIM1; k=rsa; p=MIGfMA0GCSqGSIb3DQEBAQUAA4GNADCBiQKBgQCnOLCWDuqptC9XRLtjohmMQeZ1UX+jDhgAMdlbY5Csw6y2mk9KVFR/CX0KwXq14csaSDGrmdSZJ/okGbuyL/wa9gdv8ePqYF4WHPG3Vd2rBAJEwn9UQ/X/ERwFH2QzPfBircvjkc297hM9tub8upUxRpW2/5GfPEr2CugAB7Rn0wIDAQAB; n=1024,1450122531,1465933731", "spf_analysis": { "valid": true, "lookups": 3, "final": "-all", "message": "Within the estimated limit" }, "dmarc_analysis": { "valid": true, "policy": "none" }, "bimi": "", "mta_sts": "", "tls_rpt": "" }, "advanced": { "ptr": "", "propagation": { "consistent": true, "results": [ { "provider": "Google", "server": "8.8.8.8", "result": [ "27.126.235.25" ], "time_ms": 109.78 }, { "provider": "Cloudflare", "server": "1.1.1.1", "result": [ "27.126.235.25" ], "time_ms": 31.69 }, { "provider": "Quad9", "server": "9.9.9.9", "result": [ "27.126.235.25" ], "time_ms": 224.76 }, { "provider": "OpenDNS", "server": "208.67.222.222", "result": [ "27.126.235.25" ], "time_ms": 75.61 }, { "provider": "AdGuard", "server": "94.140.14.14", "result": [ "27.126.235.25" ], "time_ms": 117.73 } ] } }, "ssl": { "available": true, "issuer": "Sectigo Limited", "subject": "www.cuhk.edu.hk", "valid_from": "2026-03-10T19:00:00-05:00", "valid_to": "2027-03-28T18:59:59-05:00", "days_remaining": 231, "san": [ "www.cuhk.edu.hk", "cuhk.edu.hk" ], "protocol": "TLSv1.2", "cipher": "ECDHE-RSA-AES128-GCM-SHA256" }, "http": { "url": "https://cuhk.edu.hk/", "status": "HTTP/1.1 200 OK", "http_version": "2", "headers": { "date": "Sun, 09 Aug 2026 05:15:17 GMT", "server": "Apache", "content-location": "index.html.en", "vary": "negotiate,accept-language", "tcn": "choice", "last-modified": "Mon, 14 Dec 2009 09:42:15 GMT", "etag": "\"19d-47aad16a9cbc0;10a-40555a080d780\"", "accept-ranges": "bytes", "content-length": "413", "content-type": "text/html", "content-language": "en" }, "security_checks": { "strict-transport-security": false, "content-security-policy": false, "x-content-type-options": false, "x-frame-options": false, "referrer-policy": false, "permissions-policy": false, "cross-origin-opener-policy": false, "cross-origin-embedder-policy": false, "cross-origin-resource-policy": false }, "server": "Apache", "powered_by": "" }, "webpage": { "url": "https://cuhk.edu.hk/", "title": "The Chinese University of Hong Kong", "description": "", "success": true, "error": "", "status": 206 }, "network": { "27.126.235.25": { "success": false, "country": "", "region": "", "city": "", "asn": "", "organization": "", "isp": "" } }, "smtp": { "host": "cuhk-st.in.tmes.trendmicro.com", "ports": [ { "port": 25, "open": false, "time_ms": 8.7, "banner": "", "error": "Connection refused" }, { "port": 465, "open": false, "time_ms": 4016.1, "banner": "", "error": "Connection timed out" }, { "port": 587, "open": false, "time_ms": 4019.9, "banner": "", "error": "Connection timed out" } ] }, "visitor": { "ip": "216.73.217.62", "reverse": "", "country": "", "country_code": "", "region": "", "city": "", "latitude": null, "longitude": null, "isp": "", "organization": "", "asn": "", "timezone": "", "browser": "Other", "os": "Other", "language": "", "user_agent": "Mozilla/5.0 AppleWebKit/537.36 (KHTML, like Gecko; compatible; ClaudeBot/1.0; +claudebot@anthropic.com)", "is_bot": true, "cloudflare": false }, "analysis_time_ms": 84.22 }