{
    "ok": true,
    "domain": "tu-chemnitz.de",
    "generated_at": "2026-08-09T12:17:36-05:00",
    "cache": {
        "hit": true,
        "ttl": 0
    },
    "score": {
        "total": 92,
        "label": "Excellent",
        "categories": {
            "dns": 100,
            "mail": 80,
            "security": 88,
            "network": 85,
            "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": 10,
                "lost_points": 0,
                "detail": "1 IPv6 address(es) detected."
            },
            {
                "category": "dns",
                "title": "Name server redundancy",
                "max_points": 20,
                "earned_points": 20,
                "lost_points": 0,
                "detail": "4 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": 15,
                "lost_points": 0,
                "detail": "DS and DNSKEY detected."
            },
            {
                "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": 0,
                "lost_points": 20,
                "detail": "No tested DKIM selector responded."
            },
            {
                "category": "mail",
                "title": "MTA-STS",
                "max_points": 5,
                "earned_points": 5,
                "lost_points": 0,
                "detail": "Mail transport policy."
            },
            {
                "category": "mail",
                "title": "TLS-RPT",
                "max_points": 5,
                "earned_points": 5,
                "lost_points": 0,
                "detail": "TLS reporting policy."
            },
            {
                "category": "security",
                "title": "Valid TLS certificate",
                "max_points": 55,
                "earned_points": 55,
                "lost_points": 0,
                "detail": "48 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": 23,
                "lost_points": 12,
                "detail": "6 of 9 evaluated headers detected."
            },
            {
                "category": "network",
                "title": "PTR reverse DNS",
                "max_points": 30,
                "earned_points": 30,
                "lost_points": 0,
                "detail": "PTR: cgi.tu-chemnitz.de"
            },
            {
                "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": 35,
                "lost_points": 0,
                "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": "ok",
                "title": "IPv6 (AAAA)",
                "detail": "1 IPv6 address(es) detected.",
                "category": "dns",
                "max_points": 10,
                "earned_points": 10,
                "lost_points": 0
            },
            {
                "level": "ok",
                "title": "Name server redundancy",
                "detail": "4 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": "ok",
                "title": "DNSSEC chain",
                "detail": "DS and DNSKEY detected.",
                "category": "dns",
                "max_points": 15,
                "earned_points": 15,
                "lost_points": 0
            },
            {
                "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": "error",
                "title": "DKIM",
                "detail": "No tested DKIM selector responded.",
                "category": "mail",
                "max_points": 20,
                "earned_points": 0,
                "lost_points": 20
            },
            {
                "level": "ok",
                "title": "MTA-STS",
                "detail": "Mail transport policy.",
                "category": "mail",
                "max_points": 5,
                "earned_points": 5,
                "lost_points": 0
            },
            {
                "level": "ok",
                "title": "TLS-RPT",
                "detail": "TLS reporting policy.",
                "category": "mail",
                "max_points": 5,
                "earned_points": 5,
                "lost_points": 0
            },
            {
                "level": "ok",
                "title": "Valid TLS certificate",
                "detail": "48 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": "6 of 9 evaluated headers detected.",
                "category": "security",
                "max_points": 35,
                "earned_points": 23,
                "lost_points": 12
            },
            {
                "level": "ok",
                "title": "PTR reverse DNS",
                "detail": "PTR: cgi.tu-chemnitz.de",
                "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": "ok",
                "title": "IPv6 connectivity",
                "detail": "AAAA availability.",
                "category": "network",
                "max_points": 35,
                "earned_points": 35,
                "lost_points": 0
            },
            {
                "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": [
                "134.109.133.7"
            ],
            "AAAA": [
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            ],
            "CNAME": [],
            "MX": [
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            "TXT": [
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                "\"v=spf1 ip4:134.109.229.63 ip4:134.109.229.193 ip6:2001:638:911:b0e:134:109:229:63 ip6:2001:638:911:b0e:134:109:229:193 include:_spf.o155.mx.srv.dfn.de ~all\""
            ],
            "NS": [
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                "secondary.rrze.uni-erlangen.de.",
                "ceres.hrz.tu-chemnitz.de."
            ],
            "SOA": [
                "ceres.hrz.tu-chemnitz.de. hostmaster.tu-chemnitz.de. 2021739249 10800 3600 2419200 3600"
            ],
            "CAA": [
                "0 issuewild \"pki.dfn.de\"",
                "0 issue \"pki.dfn.de\"",
                "0 issue \"letsencrypt.org\"",
                "0 iodef \"mailto:ca@hrz.tu-chemnitz.de\"",
                "0 issue \"harica.gr\"",
                "0 issuewild \"letsencrypt.org\"",
                "0 issuewild \"harica.gr\""
            ],
            "DS": [
                "1039 8 2 E744BA263B897D1C96CC2DD3741D35F6D352E19EC117DC285DE7687C 627DB021"
            ],
            "DNSKEY": [
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                "257 3 8 AwEAAcbbrg+QWHVEJG4B9oUJ8Vwr3Dvr9Qa6547FB6b6OFGqXLxSv3TM K56zBiKrE9gFEXVOVsSvMw2wHkAJL6hqiTsfn0uFOpoU0SpriL2YBBiO GuUUV7sn0PKOwaY8ZbKqmSp3uRdIpDlRCp7HxuIDipMKTbl3GYfqZFPO IhRpUEMw9f0R54fGqDo5K7gva0+6pZZF9oZSqtAXkCt87eeue747EU0/ DIB0xlGrNlmzXybvOWVdHko/e8UxIyOGMA6ZoPA+odHe/2eYKrVu00Df CB5qN+ABr/CcUTMODFEfBpTJz/M0A22xg82A4P4G99TpbNSqRzrUJ9BV vt6UfcdqUeU="
            ],
            "RRSIG": [
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                "TXT 8 2 600 20260816203949 20260802201206 40654 tu-chemnitz.de. b3XyFrihNCzijQFC2KpZPh7DCqEnNHkmmzV2ZbPrIJZEurj1LDxP80BH 9Ysu4XzMnlOPlMCtlr/iBaH0U2Vlh9sTwRdoEfWV/YeZ6xe/CQB1bPxw yKDu2bmCZSS/6sLcUhj5zETZEXJTngajvC4GeCUeoPy/u9BtyB2pBY/M Yf8Pmz2Kd2Y6xpOJnDY1zHE5M2KKsb+rLxbTI+Lk9pr0Lcbcr/dwmHOp +DWMoENmV5U4X6izMty0LOspM8e9hbZ1wtLMl9qDWt/2ImUeFCwQEUSI BKSLbFWguRFW4Zg3I6XiSBhCMVuNs2jWHPnx+6MAQHfGdf5LkZXCo4tx qDVktg==",
                "MX 8 2 86400 20260816203949 20260802201206 40654 tu-chemnitz.de. a8H3uCXT8oEpwY1zdQtPmSfAnTGRK24fQOX1yK3j+HSCZvcVm8RSIsdc KMMEPwfRMT8QJcyb+U13KC+oJB11gzv3bdbSV6KTtWgMlaNZvPhie/VA 27hG5lLez/Domr9UQT/XiH2GtNwyLSkukgd7vspikLGbGqQVxLggB2Up kZADTHU4ScLEUd/4l/i79iMh4fTbbViClMskoEwtLWsKTH4GMAI0Uoqy cbC94JvReEWMJgC97KhLSjj7B21K6ecNsfawQ3gkkvuVnE6NFvuvtsJL x45gnznBn5dj6mcVk52JNYVyTu+JdnqlAslbBeevC5xGRUH3vqmZyjKa mg7aJQ==",
                "NS 8 2 86400 20260816211317 20260802202024 40654 tu-chemnitz.de. NXFicgs8nfKGatQCvN1Lzwuxs8lAtN/ee7+OGAZpxQHq8D66HK5/N+wX v9+RLkAZ2vLHTAyqNl1boeMiuUdZenlYIboWtLXHk/nfo9zUIeiEk8Ly qQPHtiTCUXHtM2ll5rhuY7zaGcKPWCwmBRiQMH53rQEeEOVA6YBDLMWq 4RJLmTt6XJHN+DaJ3/pRJKrLJ3Y/n9rRypNR1zpy7kamx1IckjYSZ82/ TPwkr2SXzTSF8dDjKsimqhFHUJ6kcTQGnnJHRi1fH4cDcma9fMlBZG/e 6jytiyGYHU9DXum/MrrzCBvkFqOoFQ3ArfVqgu3DJzeaqoJXnr7eKpdV 6IDYSQ==",
                "DS 8 2 86400 20260817120903 20260803103903 32911 de. NYbMl+XI1T3nGCR107RN1dW/viLpFeHIBwDBOpWmje1SBnJUlPZlGhcx HtShwpI28AxVMsUhCmmvCEAPmtr3VKf3e8Vfb9oqKYvM1Ly5Mv6Urw08 tTPPoXob1/9XQnpINQhY+RoxZzB3bJiVptBOQPGOb0QgZLYBkdxxOHKq apQ=",
                "CAA 8 2 600 20260816192723 20260802190448 40654 tu-chemnitz.de. UpqPnzvKRN9P5W0Ugh6FtgKzyaHOsDqdZzzemmBP/kkJ9PPuEWkY/OH/ ebEW5OOIINRE0lpWMXN0KFCgnNB5Ssev7C8wXQQi0mrLisGmdoDtOxKH xUg9jVXjyF3O/+kx0hH3HgRNCzFHisTgNd4l+AGttuCVxGgcAM2a/JKh BNnh0KXlR1R+We65KO/sza2Kf2CtAdvDMXwRr8ccYx7RfjifM3W2dOmd //wiyghSlgFJAZfZR/bheNAh6TfMNKtVISNfJSzuhLdymXBspwwl4md/ ViRCwe5MsCfhkmzMalfOkqsBrGH4gU6lDDzZKAJI21D/xqvdBbhsDpkz zmzd3g=="
            ],
            "NSEC": [],
            "NSEC3": [],
            "SRV": [],
            "NAPTR": [
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            ],
            "TLSA": [],
            "SSHFP": []
        },
        "ipv4": [
            "134.109.133.7"
        ],
        "ipv6": [
            "2001:638:911:b01:134:109:133:7"
        ]
    },
    "mail": {
        "spf": "v=spf1 ip4:134.109.229.63 ip4:134.109.229.193 ip6:2001:638:911:b0e:134:109:229:63 ip6:2001:638:911:b0e:134:109:229:193 include:_spf.o155.mx.srv.dfn.de ~all",
        "dmarc": "v=DMARC1; p=none; rua=mailto:dmarc-reports@hrz.tu-chemnitz.de",
        "dkim_selector": "x",
        "dkim_host": "",
        "dkim": "",
        "spf_analysis": {
            "valid": true,
            "lookups": 1,
            "final": "~all",
            "message": "Within the estimated limit"
        },
        "dmarc_analysis": {
            "valid": true,
            "policy": "none"
        },
        "bimi": "",
        "mta_sts": "v=STSv1; id=202412120001",
        "tls_rpt": "v=TLSRPTv1;rua=mailto:tlsrpt-reports@hrz.tu-chemnitz.de"
    },
    "advanced": {
        "ptr": "cgi.tu-chemnitz.de",
        "propagation": {
            "consistent": true,
            "results": [
                {
                    "provider": "Google",
                    "server": "8.8.8.8",
                    "result": [
                        "134.109.133.7"
                    ],
                    "time_ms": 35.78
                },
                {
                    "provider": "Cloudflare",
                    "server": "1.1.1.1",
                    "result": [
                        "134.109.133.7"
                    ],
                    "time_ms": 307.05
                },
                {
                    "provider": "Quad9",
                    "server": "9.9.9.9",
                    "result": [
                        "134.109.133.7"
                    ],
                    "time_ms": 50.36
                },
                {
                    "provider": "OpenDNS",
                    "server": "208.67.222.222",
                    "result": [
                        "134.109.133.7"
                    ],
                    "time_ms": 452.6
                },
                {
                    "provider": "AdGuard",
                    "server": "94.140.14.14",
                    "result": [
                        "134.109.133.7"
                    ],
                    "time_ms": 145.56
                }
            ]
        }
    },
    "ssl": {
        "available": true,
        "issuer": "Let's Encrypt",
        "subject": "tu-chemnitz.de",
        "valid_from": "2026-06-28T19:16:46-05:00",
        "valid_to": "2026-09-26T19:16:45-05:00",
        "days_remaining": 48,
        "san": [
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            "tu-chemnitz.de",
            "tu-chemnitz.eu",
            "uni-chemnitz.com",
            "uni-chemnitz.de",
            "www.chemnitz-university.eu",
            "www.tu-chemnitz.eu",
            "www.uni-chemnitz.com",
            "www.uni-chemnitz.de"
        ],
        "protocol": "TLSv1.3",
        "cipher": "TLS_AES_256_GCM_SHA384"
    },
    "http": {
        "url": "https://www.tu-chemnitz.de/",
        "status": "HTTP/1.1 200 OK",
        "http_version": "2",
        "headers": {
            "date": "Sun, 09 Aug 2026 17:17:27 GMT",
            "server": "Apache",
            "strict-transport-security": "max-age=31536000; includeSubDomains",
            "location": "https://www.tu-chemnitz.de/",
            "content-type": "text/html; charset=utf-8",
            "x-xss-protection": "1; mode=block",
            "vary": "User-Agent",
            "x-frame-options": "SAMEORIGIN",
            "content-security-policy": "connect-src 'self' https://*.tu-chemnitz.de/; font-src 'self' https://*.tu-chemnitz.de/; frame-ancestors 'self' https://*.tu-chemnitz.de/; worker-src 'self'",
            "permissions-policy": "camera=(), geolocation=(), microphone=()",
            "referrer-policy": "same-origin",
            "x-content-type-options": "nosniff"
        },
        "security_checks": {
            "strict-transport-security": true,
            "content-security-policy": true,
            "x-content-type-options": true,
            "x-frame-options": true,
            "referrer-policy": true,
            "permissions-policy": true,
            "cross-origin-opener-policy": false,
            "cross-origin-embedder-policy": false,
            "cross-origin-resource-policy": false
        },
        "server": "Apache",
        "powered_by": ""
    },
    "webpage": {
        "url": "https://www.tu-chemnitz.de/",
        "title": "Technische Universität Chemnitz",
        "description": "Technische Universität Chemnitz",
        "success": true,
        "error": "",
        "status": 206
    },
    "network": {
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