{
    "ok": true,
    "domain": "tue.nl",
    "generated_at": "2026-08-09T00:54:46-05:00",
    "cache": {
        "hit": true,
        "ttl": 0
    },
    "score": {
        "total": 84,
        "label": "Good",
        "categories": {
            "dns": 85,
            "mail": 90,
            "security": 81,
            "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": "2 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,
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                "detail": "DS and DNSKEY detected."
            },
            {
                "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",
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                "earned_points": 55,
                "lost_points": 0,
                "detail": "68 day(s) remaining."
            },
            {
                "category": "security",
                "title": "Certificate lifetime",
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                "earned_points": 10,
                "lost_points": 0,
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            },
            {
                "category": "security",
                "title": "HTTP security headers",
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                "earned_points": 16,
                "lost_points": 19,
                "detail": "4 of 9 evaluated headers detected."
            },
            {
                "category": "network",
                "title": "PTR reverse DNS",
                "max_points": 30,
                "earned_points": 30,
                "lost_points": 0,
                "detail": "PTR: fwb-3000f-vip-01.icts.tue.nl"
            },
            {
                "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",
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                "earned_points": 40,
                "lost_points": 0,
                "detail": "At least one address family must resolve."
            },
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                "category": "availability",
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                "earned_points": 40,
                "lost_points": 0,
                "detail": "HTTP/2 200 "
            },
            {
                "category": "availability",
                "title": "HTTPS final URL",
                "max_points": 20,
                "earned_points": 20,
                "lost_points": 0,
                "detail": "Final URL uses HTTPS."
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        ],
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        "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",
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                "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": "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",
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                "earned_points": 0,
                "lost_points": 5
            },
            {
                "level": "error",
                "title": "TLS-RPT",
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                "category": "mail",
                "max_points": 5,
                "earned_points": 0,
                "lost_points": 5
            },
            {
                "level": "ok",
                "title": "Valid TLS certificate",
                "detail": "68 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": "4 of 9 evaluated headers detected.",
                "category": "security",
                "max_points": 35,
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                "lost_points": 19
            },
            {
                "level": "ok",
                "title": "PTR reverse DNS",
                "detail": "PTR: fwb-3000f-vip-01.icts.tue.nl",
                "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/2 200 ",
                "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
            }
        ]
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    "dns": {
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            "AAAA": [],
            "CNAME": [],
            "MX": [
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                "\"adobe-idp-site-verification=8d48631e0b4d87e4d1c6f0d04bc8c5b8106bfcdb3cfad0f0a2be59ae8f67f80f\"",
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                "\"facebook-domain-verification=eyg9tk0dlzfngb7spof8kirgsjye06\"",
                "\"atlassian-domain-verification=EATjeWp2TWSpBt8CIt5ngmWgUCL58gs8ZYa9LUdUS4IiMHmeJiiYEVTwYH8f07vJ\"",
                "\"anthropic-domain-verification-mdd659=5GXFiqI1LUZ2Qx559qlWCEU4x\"",
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                "\"autodesk-domain-verification=p53xRNeOV9HPWzWd2l2t\"",
                "\"HARICA-dzf3wGHrp8YxKUnknJg\"",
                "\"google-site-verification=WwQlrCFBbFYz9HaIZTCskfrONfrROlnfabGixoqwyS0\"",
                "\"google-site-verification=uNp_IVRt-7BLrpDzH925tElqmPLaeMVrFBV-MTNizv4\"",
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            "NS": [
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                "ns01.tue.nl."
            ],
            "SOA": [
                "ipam.tue.nl. hostmaster.tue.nl. 61229 10800 3600 2419200 900"
            ],
            "CAA": [],
            "DS": [
                "16415 8 2 75AA3F38B547BDC332F62485A0284820F0B554141B738DBFD5DED2B4 AE7DB4F4"
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            "RRSIG": [
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            "NSEC": [],
            "NSEC3": [],
            "SRV": [],
            "NAPTR": [],
            "TLSA": [],
            "SSHFP": []
        },
        "ipv4": [
            "131.155.10.135"
        ],
        "ipv6": []
    },
    "mail": {
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        "dkim_host": "selector1._domainkey.tue.nl",
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        "spf_analysis": {
            "valid": true,
            "lookups": 6,
            "final": "-all",
            "message": "Within the estimated limit"
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        "dmarc_analysis": {
            "valid": true,
            "policy": "reject"
        },
        "bimi": "",
        "mta_sts": "",
        "tls_rpt": ""
    },
    "advanced": {
        "ptr": "fwb-3000f-vip-01.icts.tue.nl",
        "propagation": {
            "consistent": true,
            "results": [
                {
                    "provider": "Google",
                    "server": "8.8.8.8",
                    "result": [
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                    ],
                    "time_ms": 61.34
                },
                {
                    "provider": "Cloudflare",
                    "server": "1.1.1.1",
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                    "time_ms": 517.62
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                    "provider": "Quad9",
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                    "result": [
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                    ],
                    "time_ms": 148.69
                },
                {
                    "provider": "OpenDNS",
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                    "result": [
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                    ],
                    "time_ms": 143.82
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                {
                    "provider": "AdGuard",
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                }
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        }
    },
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        "issuer": "Let's Encrypt",
        "subject": "tue.nl",
        "valid_from": "2026-07-18T09:00:38-05:00",
        "valid_to": "2026-10-16T09:00:37-05:00",
        "days_remaining": 68,
        "san": [
            "tue.nl"
        ],
        "protocol": "TLSv1.3",
        "cipher": "TLS_AES_256_GCM_SHA384"
    },
    "http": {
        "url": "https://www.tue.nl/en/",
        "status": "HTTP/2 200 ",
        "http_version": "3",
        "headers": {
            "location": "/en/",
            "content-length": "63790",
            "content-type": "text/html; charset=utf-8",
            "date": "Sun, 09 Aug 2026 05:54:36 GMT",
            "x-frame-options": "SAMEORIGIN",
            "set-cookie": "aff_93e95bd6a=1786254877.846.168.331251|829a094b5e53ea26c5e631937024f614; Path=/; Secure; HttpOnly; SameSite=Strict",
            "x-redirect-by": "RedirectUserFunction",
            "content-language": "en",
            "x-ua-compatible": "IE=edge,chrome=1",
            "x-instance": "tue-nl-typo3-php-application-7b59666cbf-kh7pp",
            "x-kvcr": "v2.e0be02/tues-p/supreme-dane/37a180347",
            "vary": "Origin",
            "referrer-policy": "strict-origin-when-cross-origin",
            "x-content-type-options": "nosniff",
            "x-cache": "Miss from cloudfront",
            "via": "1.1 d9bc1f330c3221bbb9a5d1d86ca6f1da.cloudfront.net (CloudFront)",
            "x-amz-cf-pop": "MCI50-P1",
            "x-amz-cf-id": "epfwK982xiTDY5D0x8tCDaicHoWvqFMUixh3y05Aea3q1yR5gUKgPg==",
            "age": "2048",
            "x-xss-protection": "1; mode=block",
            "strict-transport-security": "max-age=31536000",
            "accept-ranges": "bytes",
            "cache-control": "no-cache"
        },
        "security_checks": {
            "strict-transport-security": true,
            "content-security-policy": false,
            "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": "",
        "powered_by": ""
    },
    "webpage": {
        "url": "https://www.tue.nl/en/",
        "title": "503 Backend fetch failed",
        "description": "",
        "success": true,
        "error": "",
        "status": 503
    },
    "network": {
        "131.155.10.135": {
            "success": false,
            "country": "",
            "region": "",
            "city": "",
            "asn": "",
            "organization": "",
            "isp": ""
        }
    },
    "smtp": {
        "host": "tue-nl.mail.protection.outlook.com",
        "ports": [
            {
                "port": 25,
                "open": false,
                "time_ms": 36.4,
                "banner": "",
                "error": "Network is unreachable"
            },
            {
                "port": 465,
                "open": false,
                "time_ms": 4026.1,
                "banner": "",
                "error": "Connection timed out"
            },
            {
                "port": 587,
                "open": false,
                "time_ms": 4005.2,
                "banner": "",
                "error": "Connection timed out"
            }
        ]
    },
    "visitor": {
        "ip": "216.73.217.62",
        "reverse": "",
        "country": "",
        "country_code": "",
        "region": "",
        "city": "",
        "latitude": null,
        "longitude": null,
        "isp": "",
        "organization": "",
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