{
    "ok": true,
    "domain": "ustc.edu.cn",
    "generated_at": "2026-08-09T03:31:44-05:00",
    "cache": {
        "hit": true,
        "ttl": 0
    },
    "score": {
        "total": 86,
        "label": "Good",
        "categories": {
            "dns": 95,
            "mail": 90,
            "security": 73,
            "network": 55,
            "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": "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": "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": "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": 8,
                "lost_points": 27,
                "detail": "2 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": 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/2 200 "
            },
            {
                "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": "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": "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": "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": "2 of 9 evaluated headers detected.",
                "category": "security",
                "max_points": 35,
                "earned_points": 8,
                "lost_points": 27
            },
            {
                "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": "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/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
            }
        ]
    },
    "dns": {
        "records": {
            "A": [
                "202.38.64.246"
            ],
            "AAAA": [
                "2001:da8:d800:642::248"
            ],
            "CNAME": [],
            "MX": [
                "5 smtp.ustc.edu.cn."
            ],
            "TXT": [
                "\"v=spf1 ip4:202.38.64.8 ip4:202.38.64.16 ip4:202.38.64.46 ip4:210.45.120.152 ip4:202.141.161.73 ip4:195.128.10.69 ip4:199.168.14.54 ip4:202.141.163.236 ip4:205.201.128.18 ip4:210.45.71.12 ip4:195.128.10.18 ip4:195.128.10.15 -all\"",
                "\"MS=ms26813611\"",
                "\"google-site-verification=n_uAijUqmjntOJL0L8N4SIIdw_3cAngmXFBIYgIDNkg\""
            ],
            "NS": [
                "mx.ustc.edu.cn.",
                "ns.ustc.edu.cn."
            ],
            "SOA": [
                "ns.ustc.edu.cn. james.ustc.edu.cn. 2024111838 1200 900 604800 600"
            ],
            "CAA": [],
            "DS": [
                "19065 7 2 EBD1C6420F893D8FF9950ADBF896075D059006439419634128566709 8EBD74F1"
            ],
            "DNSKEY": [
                "257 3 7 AwEAAbhtB5jRa0xcRdXjJhSsJhWUv9ZOf3hwHgSJDtBH33/Gf2eBuPFY l91L8O0LzoYQmywOp7yQmmYMvrOpERPE92wDEjH4sYQG2aR3YUIuKmNt k6JXARQi37rmbiCHknq3ir2Ey5WuG8d085OOkMVMLy8Vt+GhMOLFAVAd FHmBqSnWHjaXVPdEEUoxcz0vL3/xq7bivQy1+j4lz1I1L7vqpBioE47v lm0gBGSz0+RdFh2UdqxthvH/Mj2BcZLQ8mS7UhAgVJbRKVM2ncZr7+KH tQZhfWLHk4ULQ8YBxcZzQEALSk+70EeyJpJQClcZPWi1QmEwDbFXGVN4 +TJECo75f5c=",
                "256 3 7 AwEAAZ/Me3jG9Lgpyh7kHMHm/jTGttmeaV2ixsEY7/cmE03Y5hYoOmkM FBGtq8xaE16hoPVDdp6QEzM/S+zMaex5JmkZ3pYwdwoslQ9VbHgTnO+n x0nt5j+moYzqiAK5ht2jJkm8vshikyVWbehMrHrrn1tjbkjPLFriaCft HAPXss13"
            ],
            "RRSIG": [
                "AAAA 7 3 3600 20260903135335 20260804135335 32747 ustc.edu.cn. Qv+GSGRNvtYX2isrcxdSqFucXSdNkDAZxGkVF7w3qU9R3Zd8f5qv+lNk rzcYE8h0Cw3Kctxse+IMrjqegMdQxtclFH0MD01OLvICycudo7azRyH6 n1ZD9d3A0+U41/Dl3/i45D8x4ZiE5GG0Fr35Bgsew5ys0fjq0kQeU/4C oY4=",
                "TXT 7 3 3600 20260903135335 20260804135335 32747 ustc.edu.cn. DleS5rrFSmmSvHit+N11CM2cuUyv+3Ajw0gwMrapMaEIhcKRHNGtvzJQ mPqfSyM71lT6yG9IfoisBwWnxP3lQxLGtZVWZBjghn8DboEza5YLTIqO TjB/WkRqc7evmgy2HoWEfKAU7H3VXLbdHSgOkG+nY6T1wOW4pQL/eJk/ /RY=",
                "NS 7 3 3600 20260903135335 20260804135335 32747 ustc.edu.cn. F27Sj48ogj4VcQOHdfsjU1c5kerUNx5qWdF9kJd/f+qxPCHf/aUWiP+F ImUe/ShJ6a4mcrw1ogNMyTaNg7ZUvnwJA0ZXy9fr91cISAgK1gW32OdE AfwkqVp7M668ACo+sgL6PTe16Vc1Xcj18Kpp7kXoHq/gSuSPMowK/mV9 JPM=",
                "SOA 7 3 3600 20260903135335 20260804135335 32747 ustc.edu.cn. Vb51YWTIrKfQGsPaNHq+aiMP+weUxvalGYaFuD44EFftDcZTUuP8N3Ek tgNNTHOA9p9Ya8APpnxMr0tBrSrhtDc5zZO9B7H9DUbFpwnQv/1kAJgp rPMAHTR8doBoUowFyh2QVGaJrVs4TyyIzJTBEP4si2QGQ9tDf1tmJ8O8 +KY=",
                "DNSKEY 7 3 1200 20260903135335 20260804135335 32747 ustc.edu.cn. EbxMk/I/mGiCuW+/3dLdwqEvKY5/AMTDnKf3jBJaan5H3q2i4jOKkyZW 6Cvfwxc8uvOJeFv4KldPsdWnqxQ6cgYxIHzLxjZe4JEd9ANBCLdQaChB gWMLoPkOIkxqyy+lmwpzwOP9tgy3sWP7UYuMMvSLlbiujBKBNXOXmr/L fsM=",
                "DNSKEY 7 3 1200 20260903135335 20260804135335 19065 ustc.edu.cn. XsEdi1itEwxw87ooTwwftXw8I5DgW89GZa42GBcHWIGehU/p6lq+bBG1 SUZ81puefw/vN/fKn1vxWBdskgMWgMXVccUMDY0s43fvERFcis+7aWgl REBw/QO8k0Br0b3+8B1MVsRILggz5pI3P9eGFsdVayBa9eq4k/jhSXZx qT9gPXQ3eARhGAbr+1kB1hu5coz++wvsdauDJojsIutolGlEBR/1UVZ3 vbOhF92aWmHgN2t2OIncokGlUy18fdmomHja/c2CdumbsBvsAQ3ailHM IhMPZ0sm8WMlgVsDsCUdgCcVqQ62sPeXiQyGCZjS6iS3AVsWOaHreOHW OOwRMA==",
                "MX 7 3 3600 20260903135335 20260804135335 32747 ustc.edu.cn. MoQ9oDS/uWXkaI3X4jyelsO96nuQe6so8lMTY/r+zJeClAPrn52JHkdu Q+gI4hyZZrDO0NAKCaroP4ym2iyLBVTImNkU6YXZcjEWjH8Bk7nlW8Mx xkU90UMhMr7Ck05AlggbBRpXdwmjM8OIvLHlRJTi6F4/GhmQ1BjfjAft RL4=",
                "A 7 3 3600 20260903135335 20260804135335 32747 ustc.edu.cn. YW5urrKTwLjq7wn9RXASMnj+sR4Bg+5QG3yT/DAPe+YXF9gJsNVqKNmg QkR8NRPZdgw+l39PPZKb/vG8ZaqkGBeNhrUryIHBCe9dD0a3ae5+ULTl 7UZmTI9hiAiAox9B5hzDErKqkZK11vm6LOhpP2skAoSqiebwCP3cMMi4 e48=",
                "DS 8 3 172800 20260818145404 20260804141213 44583 edu.cn. hH6o3QGIBFFSWZdozpIQu7DGx5Ao/uTi/l4UlBVNPTZKJnXeCxeVjJrc PMfWh4HdDCHjZaFHKLGn2VJig5LH77gYTM9kHTblEHlypipRFj86FHMf hZdR1wHJZ15mJk94SGlosxpByiYs98tP+va4JItfaCBbqjYtMvpElirv bZBqjPlbfVEuz3sFV37QAOW1l/ahXHyFoEac5yRaVxM6uUHgfCfIbIjT PER+nghD10YHSnZ6bo1RJnvYfB2eoa/T+lq/0Fa48+LrDE4dAGb1TfHS zk/rvQzUswQ3a5hAeRzIQhtquG3eROo1Gbyp14DYStjT25E3wYkEE2QC kUSdqw==",
                "NSEC3PARAM 7 3 0 20260903135335 20260804135335 32747 ustc.edu.cn. jQajbImC3gvI3vUa7NzaW1tngjQozRnhH9k+Rt3hs+7ZZ9O6trgHePrA 0oGHcQ55NFf0gLADCz0x9YOHviyZW6tp29cPWHHEwjOY+BsdQ4pg7TIG 1dvdGRAUU5aOPGnhqpq42j8AMIVO5LTC0S3f2kOKbx/70yK0nMSrzOn6 zYk="
            ],
            "NSEC": [],
            "NSEC3": [],
            "SRV": [],
            "NAPTR": [],
            "TLSA": [],
            "SSHFP": []
        },
        "ipv4": [
            "202.38.64.246"
        ],
        "ipv6": [
            "2001:da8:d800:642::248"
        ]
    },
    "mail": {
        "spf": "v=spf1 ip4:202.38.64.8 ip4:202.38.64.16 ip4:202.38.64.46 ip4:210.45.120.152 ip4:202.141.161.73 ip4:195.128.10.69 ip4:199.168.14.54 ip4:202.141.163.236 ip4:205.201.128.18 ip4:210.45.71.12 ip4:195.128.10.18 ip4:195.128.10.15 -all",
        "dmarc": "v=DMARC1; p=quarantine; rua=mailto:postmaster@ustc.edu.cn",
        "dkim_selector": "dkim",
        "dkim_host": "dkim._domainkey.ustc.edu.cn",
        "dkim": "v=DKIM1; k=rsa; p=MIGfMA0GCSqGSIb3DQEBAQUAA4GNADCBiQKBgQDJvKz7FR0FC8iH15PgZIW720prG7yeJSc0ZVtrT1Q6pOazbMevkNTIYap+VQfh0qqrkDq0WXiJJ6IwURaPFluYs5Gxcj84RAX9s2qBhzlGA6HdvRGH8PwnFW4wacM6c8v62aWP/NfslJg+LZkRpLJG7e52Fv6RFKhkoNpQYyGfmQIDAQAB",
        "spf_analysis": {
            "valid": true,
            "lookups": 0,
            "final": "-all",
            "message": "Within the estimated limit"
        },
        "dmarc_analysis": {
            "valid": true,
            "policy": "quarantine"
        },
        "bimi": "",
        "mta_sts": "",
        "tls_rpt": ""
    },
    "advanced": {
        "ptr": "",
        "propagation": {
            "consistent": true,
            "results": [
                {
                    "provider": "Google",
                    "server": "8.8.8.8",
                    "result": [
                        "202.38.64.246"
                    ],
                    "time_ms": 273.61
                },
                {
                    "provider": "Cloudflare",
                    "server": "1.1.1.1",
                    "result": [
                        "202.38.64.246"
                    ],
                    "time_ms": 269.98
                },
                {
                    "provider": "Quad9",
                    "server": "9.9.9.9",
                    "result": [
                        "202.38.64.246"
                    ],
                    "time_ms": 332.27
                },
                {
                    "provider": "OpenDNS",
                    "server": "208.67.222.222",
                    "result": [
                        "202.38.64.246"
                    ],
                    "time_ms": 900.81
                },
                {
                    "provider": "AdGuard",
                    "server": "94.140.14.14",
                    "result": [
                        "202.38.64.246"
                    ],
                    "time_ms": 304.53
                }
            ]
        }
    },
    "ssl": {
        "available": true,
        "issuer": "ZeroSSL GmbH",
        "subject": "ustc.edu.cn",
        "valid_from": "2026-06-27T19:00:00-05:00",
        "valid_to": "2026-09-26T18:59:59-05:00",
        "days_remaining": 48,
        "san": [
            "ustc.edu.cn"
        ],
        "protocol": "TLSv1.3",
        "cipher": "TLS_AES_256_GCM_SHA384"
    },
    "http": {
        "url": "https://ustc.edu.cn/",
        "status": "HTTP/2 200 ",
        "http_version": "3",
        "headers": {
            "server": "nginx",
            "date": "Sun, 09 Aug 2026 08:31:32 GMT",
            "content-type": "text/html",
            "content-length": "40137",
            "x-frame-options": "SAMEORIGIN",
            "last-modified": "Sun, 09 Aug 2026 02:10:05 GMT",
            "accept-ranges": "bytes",
            "vary": "User-Agent,Accept-Encoding",
            "cache-control": "private, max-age=600",
            "expires": "Sun, 09 Aug 2026 08:41:32 GMT",
            "etag": "\"9cc9-65893bc77cc95-gzip\"",
            "content-language": "zh-CN",
            "strict-transport-security": "max-age=15769000"
        },
        "security_checks": {
            "strict-transport-security": true,
            "content-security-policy": false,
            "x-content-type-options": false,
            "x-frame-options": true,
            "referrer-policy": false,
            "permissions-policy": false,
            "cross-origin-opener-policy": false,
            "cross-origin-embedder-policy": false,
            "cross-origin-resource-policy": false
        },
        "server": "nginx",
        "powered_by": ""
    },
    "webpage": {
        "url": "https://ustc.edu.cn/",
        "title": "",
        "description": "",
        "success": false,
        "error": "SSL connection timeout"
    },
    "network": {
        "202.38.64.246": {
            "success": false,
            "country": "",
            "region": "",
            "city": "",
            "asn": "",
            "organization": "",
            "isp": ""
        }
    },
    "smtp": {
        "host": "smtp.ustc.edu.cn",
        "ports": [
            {
                "port": 25,
                "open": false,
                "time_ms": 241.9,
                "banner": "",
                "error": "Connection refused"
            },
            {
                "port": 465,
                "open": false,
                "time_ms": 240.5,
                "banner": "",
                "error": "No connection"
            },
            {
                "port": 587,
                "open": false,
                "time_ms": 4312.6,
                "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": 91.51
}