{
    "ok": true,
    "domain": "hku.hk",
    "generated_at": "2026-08-08T23:39:51-05:00",
    "cache": {
        "hit": true,
        "ttl": 0
    },
    "score": {
        "total": 83,
        "label": "Good",
        "categories": {
            "dns": 75,
            "mail": 90,
            "security": 84,
            "network": 50,
            "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": "7 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": 5,
                "lost_points": 0,
                "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": "2 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": "123 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": 19,
                "lost_points": 16,
                "detail": "5 of 9 evaluated headers detected."
            },
            {
                "category": "network",
                "title": "PTR reverse DNS",
                "max_points": 30,
                "earned_points": 30,
                "lost_points": 0,
                "detail": "PTR: www.hku.hk"
            },
            {
                "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": "7 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": "ok",
                "title": "CAA policy",
                "detail": "Certificate authority restriction.",
                "category": "dns",
                "max_points": 5,
                "earned_points": 5,
                "lost_points": 0
            },
            {
                "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": "2 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": "123 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": "warning",
                "title": "HTTP security headers",
                "detail": "5 of 9 evaluated headers detected.",
                "category": "security",
                "max_points": 35,
                "earned_points": 19,
                "lost_points": 16
            },
            {
                "level": "ok",
                "title": "PTR reverse DNS",
                "detail": "PTR: www.hku.hk",
                "category": "network",
                "max_points": 30,
                "earned_points": 30,
                "lost_points": 0
            },
            {
                "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": [
                "147.8.2.58"
            ],
            "AAAA": [],
            "CNAME": [],
            "MX": [
                "10 hku-nsp2.hku.hk.",
                "10 hku-nsp1.hku.hk."
            ],
            "TXT": [
                "\"v=spf1 include:spf.protection.outlook.com ip4:147.8.2.0/24 ip4:147.8.145.0/24 ip6:2001:ce0:2201:101:0:ffff::/121 ~all\"",
                "\"google-site-verification=_C4nHLOPp9Ajm7BVjbWxPAulgD0ru2d9tLGPRatVpxI\"",
                "\"verify_f09d950492d1d3a7feedcda73a6f49d7\"",
                "\"f9v/WS1DdqF1EzBMQ5qKklq5bsIeGnS+X2hlcL4fG5ot2ZVdGp87PuhmqJejGwLAeXVVeef1d+DeX14GHUPSGg==\"",
                "\"workplace-domain-verification=PCvyuPaHHF1oCC2mnVDimXMSMEyemI\"",
                "\"google-site-verification=1zHEuivH16oqx7Xr3VPN6HrYCGSvFwiTbXT6AGFFerY\"",
                "\"atlassian-domain-verification=p1a/IoR22M8YOTNy1Q4nCax5kIke4k8k32z4JcdOql8dllv8vRd3AzCxQQ18UCB1\""
            ],
            "NS": [
                "ns2.cuhk.edu.hk.",
                "ns4.hku.hk.",
                "ns1.hku.hk.",
                "ns2.hku.hk.",
                "ns10.gdnsdef.com.",
                "ns3.hku.hk.",
                "ns10.gdnsec.com."
            ],
            "SOA": [
                "ns1.hku.hk. ccssg.hku.hk. 2026080601 3600 900 604800 43200"
            ],
            "CAA": [
                "0 issue \"entrust.net\"",
                "0 issuewild \"geotrust.com\"",
                "0 issuewild \"godaddy.com\"",
                "0 issue \"pki.goog\"",
                "0 issue \"amazontrust.com\"",
                "0 issuewild \"globalsign.com\"",
                "0 issuewild \"pki.goog\"",
                "0 issue \"globalsign.com\"",
                "0 issuewild \"letsencrypt.org\"",
                "0 issue \"geotrust.com\"",
                "0 issuewild \"digicert.com\"",
                "0 iodef \"mailto:hostmaster@hku.hk\"",
                "0 issue \"hongkongpost.gov.hk\"",
                "0 issue \"comodoca.com\"",
                "0 issue \"awstrust.com\"",
                "0 issue \"sectigo.com\"",
                "0 issue \"godaddy.com\"",
                "0 issue \"digicert.com\"",
                "0 issue \"amazon.com\"",
                "0 issue \"amazonaws.com\"",
                "0 issue \"letsencrypt.org\"",
                "0 issue \"ecert.gov.hk\""
            ],
            "DS": [],
            "DNSKEY": [],
            "RRSIG": [],
            "NSEC": [],
            "NSEC3": [],
            "SRV": [],
            "NAPTR": [],
            "TLSA": [],
            "SSHFP": []
        },
        "ipv4": [
            "147.8.2.58"
        ],
        "ipv6": []
    },
    "mail": {
        "spf": "v=spf1 include:spf.protection.outlook.com ip4:147.8.2.0/24 ip4:147.8.145.0/24 ip6:2001:ce0:2201:101:0:ffff::/121 ~all",
        "dmarc": "v=DMARC1; p=none;sp=none;fo=1;rua=mailto:dmarc@hkucc.hku.hk",
        "dkim_selector": "default",
        "dkim_host": "default._domainkey.hku.hk",
        "dkim": "v=DKIM1; k=rsa; p=MIGfMA0GCSqGSIb3DQEBAQUAA4GNADCBiQKBgQCp7z/AuHnlvzn5gq2yAWaZ91lsldZ6dYebmP3ERJ1evw8V6G9q5BCJoQv+5lMrq0a3GSGPArQFyj28lmKlH1hwsf2PlDB9hxNBRN6/DNSHPjF+yuuDOUGI1U/deX4vNwPgTY0dSt9iRgIcLyADxi5oVKT4cg959rytvs/RaPyktwIDAQAB",
        "spf_analysis": {
            "valid": true,
            "lookups": 1,
            "final": "~all",
            "message": "Within the estimated limit"
        },
        "dmarc_analysis": {
            "valid": true,
            "policy": "none"
        },
        "bimi": "",
        "mta_sts": "",
        "tls_rpt": ""
    },
    "advanced": {
        "ptr": "www.hku.hk",
        "propagation": {
            "consistent": true,
            "results": [
                {
                    "provider": "Google",
                    "server": "8.8.8.8",
                    "result": [
                        "147.8.2.58"
                    ],
                    "time_ms": 61.72
                },
                {
                    "provider": "Cloudflare",
                    "server": "1.1.1.1",
                    "result": [
                        "147.8.2.58"
                    ],
                    "time_ms": 236.16
                },
                {
                    "provider": "Quad9",
                    "server": "9.9.9.9",
                    "result": [
                        "147.8.2.58"
                    ],
                    "time_ms": 250.52
                },
                {
                    "provider": "OpenDNS",
                    "server": "208.67.222.222",
                    "result": [
                        "147.8.2.58"
                    ],
                    "time_ms": 389.92
                },
                {
                    "provider": "AdGuard",
                    "server": "94.140.14.14",
                    "result": [
                        "147.8.2.58"
                    ],
                    "time_ms": 489.72
                }
            ]
        }
    },
    "ssl": {
        "available": true,
        "issuer": "DigiCert, Inc.",
        "subject": "*.hku.hk",
        "valid_from": "2026-06-11T19:00:00-05:00",
        "valid_to": "2026-12-10T17:59:59-06:00",
        "days_remaining": 123,
        "san": [
            "*.hku.hk",
            "hku.hk"
        ],
        "protocol": "TLSv1.2",
        "cipher": "ECDHE-RSA-AES256-SHA"
    },
    "http": {
        "url": "https://hku.hk/",
        "status": "HTTP/1.1 200 OK",
        "http_version": "2",
        "headers": {
            "date": "Sun, 09 Aug 2026 04:39:49 GMT",
            "server": "Apache",
            "x-xss-protection": "1; mode=block",
            "x-frame-options": "ALLOW-FROM *.hku.hk",
            "referrer-policy": "no-referrer-when-downgrade",
            "feature-policy": "",
            "expect-ct": "",
            "report-to": "",
            "nel": "",
            "content-security-policy": "upgrade-insecure-requests, upgrade-insecure-requests",
            "x-content-type-options": "nosniff",
            "strict-transport-security": "max-age=31536000",
            "upgrade": "h2,h2c",
            "connection": "Upgrade",
            "last-modified": "Sat, 08 Aug 2026 16:01:04 GMT",
            "etag": "\"17d0a-6588b3a6e1892\"",
            "accept-ranges": "bytes",
            "content-length": "97546",
            "set-cookie": ";HttpOnly;Secure, ;HttpOnly;Secure",
            "content-type": "text/html"
        },
        "security_checks": {
            "strict-transport-security": true,
            "content-security-policy": true,
            "x-content-type-options": true,
            "x-frame-options": true,
            "referrer-policy": true,
            "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://hku.hk/",
        "title": "The University of Hong Kong (HKU)",
        "description": "Established in 1911, the University of Hong Kong (HKU) is the territory’s oldest institute of higher learning and also an internationally recognized, research led, comprehensive university.",
        "success": true,
        "error": "",
        "status": 206
    },
    "network": {
        "147.8.2.58": {
            "success": false,
            "country": "",
            "region": "",
            "city": "",
            "asn": "",
            "organization": "",
            "isp": ""
        }
    },
    "smtp": {
        "host": "hku-nsp2.hku.hk",
        "ports": [
            {
                "port": 25,
                "open": false,
                "time_ms": 48.1,
                "banner": "",
                "error": "Connection refused"
            },
            {
                "port": 465,
                "open": false,
                "time_ms": 204.9,
                "banner": "",
                "error": "Connection refused"
            },
            {
                "port": 587,
                "open": false,
                "time_ms": 200.2,
                "banner": "",
                "error": "Connection refused"
            }
        ]
    },
    "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": 85.76
}