{
    "ok": true,
    "domain": "cau.edu.cn",
    "generated_at": "2026-08-10T18:52:18-05:00",
    "cache": {
        "hit": true,
        "ttl": 0
    },
    "score": {
        "total": 80,
        "label": "Good",
        "categories": {
            "dns": 85,
            "mail": 90,
            "security": 65,
            "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,
                "lost_points": 0,
                "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": "3 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": "47 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": 30,
                "lost_points": 0,
                "detail": "PTR: \\@.cau.edu.cn"
            },
            {
                "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": "2 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": "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": "3 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": "47 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": "ok",
                "title": "PTR reverse DNS",
                "detail": "PTR: \\@.cau.edu.cn",
                "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": [
                "202.205.80.179"
            ],
            "AAAA": [],
            "CNAME": [],
            "MX": [
                "5 gw1.cau.edu.cn.",
                "5 gw2.cau.edu.cn.",
                "3 mx-cau-edu-cn.icoremail.net."
            ],
            "TXT": [
                "\"google-site-verification=Y9Zg-qVkdizAGjyp9hXIofB3roPPDIxBmbGg83d51ig\"",
                "\"google-site-verification=Iya0Br1NJ3a9kQ9tKysvfkSKm5DZLBEON2CTHmAoMWA\"",
                "\"v=spf1 mx ip4:211.82.93.128 ip4:211.82.93.129 ip4:211.82.95.94 ip4:211.82.93.96 ip4:211.82.95.95 ip4:211.82.93.97 ip4:114.251.217.111 ip4:114.251.217.10 ip4:114.251.217.13  ip6:2001:250:209:B02::173  include:spf.icoremail.net -all\""
            ],
            "NS": [
                "nsb.cau.edu.cn.",
                "ns.cau.edu.cn."
            ],
            "SOA": [
                "ns.cau.edu.cn. root.ns.cau.edu.cn. 2100054551 10800 300 604800 86400"
            ],
            "CAA": [],
            "DS": [
                "22270 8 2 A5A213350D23B0287725A17BF22890E01CB3C70C9D0A9698D165EC83 D89BCACC"
            ],
            "DNSKEY": [
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                "257 3 8 AwEAAdiZ4zx+b8K4PBN6ZkYNvm6k1GW8jtBm65aPEYCWwAFhq5b3D9w4 NBpjPsCDz9qK6u/Lgw5+Apa8QhaYW+FSuGr4EGvo5BjYFQIiR9Upsf/g l+sw7/xWJM7OaglgBR6HmBhhvGS0VQV/26T+s/CIp2c8ievq959hQQ6L 28cvQmH1MMlC3GYrVedVRF8fCiHyJ88SGWzFOKRUNkk/sY8fnc2N4qr/ 9oGQA2Zs1vSWqn8ZaMPPgVnh3HuQMd35uPI8guxKqrduDVAsShNVRsGo RG7pSvfUbZ93fFVfpXnTb+12TY5GcD8x6P+S2kQC7TYPSOHxdcvh4Zwx 2F70yuUd+8k="
            ],
            "RRSIG": [
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                "NS 8 3 3600 20260827003747 20260728001738 4251 cau.edu.cn. WRZPFXSIdWk/m1nGRY+baAZFnAR3hN7XjRg22RoPnoZt+0cIHPamZIFH w95q0EWkk+PPVnKbx3jtWlzpHQ67kHMGsuYHtrOgn5mrUoqgcCP8DMxd dva0CAyFox58cV16ZjcHI4FONMseGMA66zeYx2qtuGGigognljMtCEOD QacYesoh7ixmxUN5B38sn+SkWbRFVygi+WQxGev+ZQq0M65VRhuaL5jo ZsVTVpSL2zS5EdbYWaYtzcX8IOYv04LjICIYgpt49foMzO9OyVHEMgiZ fmcmxSu0YPTkSciUlbOxkS79+db+n6+Ma7Eaa64vMR6oO/SuRQy6HmES /5Q4Yw==",
                "SOA 8 3 3600 20260909215651 20260810205651 4251 cau.edu.cn. hVFEtmpwe6w+MDGRXDxrKxI+jKya+S7QGOFVqANh07/x6UTb8soEynmg DoVlh+k/NmUUavSnrbZ00uWmnuS45nokJmmNXOCabPQPF/jywPm9qS+6 VZ1OpkqlOqHV1ncmhQ5xxsdFW8n3CiqJ/adAGhcjAb8/KrlufHNOd+ia RcL2vEOEG3Fsc1lf88AiD33oHmNWJvBkn2pnJyDTUgDuAOSYXclnHjSf 4tZowZVTG0+DKRFmK3UqLtw1U6/OXgeDFwJZFHK486xqJ+jZQxUGnmte RHdB4dlf7fKF5a5NgvnPgVmoDMFB831mS3g/8L1zW/Syqm9B5WSUZyzp hZ+rJQ==",
                "DNSKEY 8 3 3600 20260821233406 20260722232448 4251 cau.edu.cn. XOSfIHZ7ubVOOAy0s4jYz0s1Pxx4e1/NSRWbdOpUnV+yS9kGHddB2nMh jI4oTeQWFWCJkhXOBDpNpe+SApMsAiv23ZnVxoiXadrQrkkG2hI1LVN1 S2/LfMWWziogcW4v3iyU25U6XNVAOfPfjC/nCHilxcSO/wdE+mX+8P+f zVVMjd5MvoVC2yKNcWJf8f79IRfu9nuwim15CKicd8AaY7hwmFGfM34h /4Iu+dXmPj6LgyzWEC9qDSgff41nAjXsMgG5h8jkzwLQRAnAsFMfHItJ 2x//AukZ3rqdfL+MkXDuA+HdlzQLMawX2OkKZ5ZDqjFiA4vPvZYNmLkr v5Y0Yw==",
                "DNSKEY 8 3 3600 20260821233406 20260722232448 22270 cau.edu.cn. TXpwk17ReOL0uy+nlFGc70ks2hgM2j6DjFkq7p8oK7TAVwdPyyq3pRuV S8N+M0bP4mZ1SHnIrh2znM+G3AR9hAfC6mdWSIDWKaE73CTKfg274STf 9cm7gO6W3efUvNkgkwTxYuBS7a/uNnUdtrHUkqBqxlyrFKJaC5w5pTvN pw/rZf5FMwn/BzTLFICxR/eQIqqU7qSJgu32AGFNwC+Gpk0OL4vM7Y2Q VSnOCCMnguyNDLxbhE7jLF8vEZwkCbrKjc2JCeJ0PcJ/97wrdSIj7BcJ P5gnHyc0zlhssD6M9y5bYZqBAnS96mWzCGouiD+gqzYY1UtNsnuaGwda z5nz4g==",
                "TXT 8 3 3600 20260827003747 20260728001738 4251 cau.edu.cn. aLwBA8sndeEhEu6OMDge3ph9W3SYC4ffvnUQYwL64TbC9ER7Jq06QRED UCYMyzcugGT7Xpbz7KY7yOursIlYxfqdcSIkYDVXhDfLRKAExtuD5oMz XdU8zI9apkAFgVR8JzjZ/4v0XB4BJKVcKkeo0gjytA0djuCv1H86Sm2K nkL+v8UDZ78OsI8e+/WC9iMbCPezBaaUtgabAwMfLv8utY/BPxmsj0Lm kGCtUMU8tIhy3+Md6TJNGpy5DSUTHEushpyOMyBqVoA+FQXvni0hHVRq qYCyJPHBZK4LhSF8r6tGwVP6U/VBDjrbLA2f/NTbHH4sintSDYldk1kQ FHtXLg==",
                "MX 8 3 3600 20260827003747 20260728001738 4251 cau.edu.cn. QuuKttibVWKf8fnVpgpAToZlo+aKx3J1OT9lhVqNagEdTTQhQvPFQU/w C0XCzaOdDLXpcIVmuu+fSlIB8bVZktVhMqVm7TaYIWLasbsLlkVw2WuS b40vW7y1e7ZX9oI/oCfPsbPrGNs8z9BHO9hvAdjPzN11LLwVv2tNglY0 MVMaqIClyL3UBfvdBAuepIChOKJcZWSd0ijDPwHihsgSUTiADpVXFzFu ZmolNqwQeJb0fSjtShaRy9SQxHtAyhgzfDzZmTB3vmpOQwRF42IIZUP+ tr2LJDGbA4sga67dO1Wg6dsKINZSbWmjtvfd9LHeqWL0g0Q/hUszSDpx sty0AA==",
                "DS 8 3 172800 20260818145404 20260804141213 44583 edu.cn. l31720QaDLY4qRrJiMe2NQNG8Y1c2x/wHWdFlkCTUoI6zK68G+dcYcT9 ZuRezf9QW1rl3SCQ66/pOIybFmrKaC9uRt25zogz4lDmIwlkd5sYZKq0 EE4U9eVBafasBoDyEWw+8+mAIOsAQrmkX1cszwj+nmUQfzeHT6+xTvEj Jjwsi7LEfMW3bEOq7gsXOa3HTPwgDwwd2a+gln9wAXnYnjKMrte0dmew rkuBtBA1tD7qDcEN51/z4yz0BLD0reijyqwcju/nzgVylgUAP/+UpLrr iVRzMgXFQv96ag59a8LfiEAvLcAlgvm8kqmYBFpo1CHMxtnPmpSFtiH+ BA420Q==",
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                "NSEC3PARAM 8 3 0 20260824080607 20260725074318 4251 cau.edu.cn. H+DKCJLtBYSJJ1aM11j3dwB5AY6+qgrwyFepytvwZfmpzwjkW9C83S7k Le0khGQhfOPerGfmu/lKsDf+HSsVJCPSmxW8NC4TSVpxMRGpl7PvtwQz Zgan0JTlfjMsqfAiNire+KPxpejUD9Axgovoo3EV0Pr2kZO0FAoj2vIY 7RUUqfHmTSIgDj0oM6KgTg5GTWXzWWWh0tn/Ny6EQlRbyCgADOnMyPq9 qzpjYJKGChYSltABmHEsZ6NrAmppgQaulxSQ6GAQLY66wxzQD9SfwS2r 69KoE69Y1UVqbhx2uE4mIcFQ929j0u/TibVoXAoSgaatvDmH1mQYO03D VABSag=="
            ],
            "NSEC": [],
            "NSEC3": [],
            "SRV": [],
            "NAPTR": [],
            "TLSA": [],
            "SSHFP": []
        },
        "ipv4": [
            "202.205.80.179"
        ],
        "ipv6": []
    },
    "mail": {
        "spf": "v=spf1 mx ip4:211.82.93.128 ip4:211.82.93.129 ip4:211.82.95.94 ip4:211.82.93.96 ip4:211.82.95.95 ip4:211.82.93.97 ip4:114.251.217.111 ip4:114.251.217.10 ip4:114.251.217.13  ip6:2001:250:209:B02::173  include:spf.icoremail.net -all",
        "dmarc": "v=DMARC1;p=none;ruf=mailto:dmarc@cau.edu.cn;rua=mailto:dmarc_report@cau.edu.cn",
        "dkim_selector": "dkim",
        "dkim_host": "dkim._domainkey.cau.edu.cn",
        "dkim": "k=rsa;d=cau.edu.cn;p=MIGfMA0GCSqGSIb3DQEBAQUAA4GNADCBiQKBgQDCMs3RrLHVrgHV6dRTxrdmXH/yb/fjTToUr82xvgwyvLX2j09oqoCgi3a/tfGtqxz2XPpxyUYTN1VXtiTRPoVJrsjxa0xyeqN9bQJbWSjaZYxCC6RR2sMdV12iyklw3c6yjqjseAxGh+BHHHes46VdPdnWTinE8RGIosxmNCw7bQIDAQAB",
        "spf_analysis": {
            "valid": true,
            "lookups": 2,
            "final": "-all",
            "message": "Within the estimated limit"
        },
        "dmarc_analysis": {
            "valid": true,
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