{ "ok": true, "domain": "sjtu.edu.cn", "generated_at": "2026-08-09T00:08:02-05:00", "cache": { "hit": true, "ttl": 0 }, "score": { "total": 56, "label": "Fair", "categories": { "dns": 85, "mail": 90, "security": 0, "network": 50, "availability": 60 }, "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": "4 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": 0, "lost_points": 55, "detail": "No valid certificate was retrieved." }, { "category": "security", "title": "Certificate lifetime", "max_points": 10, "earned_points": 0, "lost_points": 10, "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: www.sjtu.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": 0, "lost_points": 40, "detail": "No successful HTTP response." }, { "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": "4 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": "error", "title": "Valid TLS certificate", "detail": "No valid certificate was retrieved.", "category": "security", "max_points": 55, "earned_points": 0, "lost_points": 55 }, { "level": "error", "title": "Certificate lifetime", "detail": "Full points require at least 30 days remaining.", "category": "security", "max_points": 10, "earned_points": 0, "lost_points": 10 }, { "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: www.sjtu.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": "error", "title": "HTTP response", "detail": "No successful HTTP response.", "category": "availability", "max_points": 40, "earned_points": 0, "lost_points": 40 }, { "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": [ "202.120.2.119" ], "AAAA": [], "CNAME": [], "MX": [ "10 mx01.sjtu.edu.cn.", "20 mx03.sjtu.edu.cn.", "10 mx02.sjtu.edu.cn.", "20 mx04.sjtu.edu.cn." ], "TXT": [ "\"google-site-verification=mcuNzNPcotg0Umk8i7PNvtpd5_wDv6V-Q-Fo3vYMcxk\"", "\"v=spf1 ip4:202.112.26.0/24 ip4:202.120.2.0/24 ip4:202.121.179.0/24 ip4:111.186.58.48 ip4:111.186.58.61 ip4:111.186.58.62 ip4:111.186.58.66 ip4:111.186.58.24 -all\"", "\"ic14zi8kzf8g848uofs9wvk1s43dzz88\"" ], "NS": [ "dns.sjtu.edu.cn.", "apple.sjtu.edu.cn." ], "SOA": [ "dns.sjtu.edu.cn. hostmaster.sjtu.edu.cn. 2608081951 10800 3600 604800 3600" ], "CAA": [], "DS": [ "37831 8 2 3A539EDE90E0619501F909760CA33DC69C07B18BB4E5B19D2D3EB9EA 544A0B2C" ], "DNSKEY": [ "256 3 8 AwEAAbY3Z/XLT9tud2Xa10s6Kudhvx+Y+u2fM+/xd8MnnZbdOyik4F2t c3XMojdmMSxg5G2HwyhUdsOK90GlZocT+GrGe4a10DWtwO2eKg1jPq7p rbEjUcpP0Ikh/x8SQMo2JOyYaUyCJynzEnORvRBdSs3e2mbHPp7CWnX3 UbrEBraV", "257 3 8 AwEAAbucesgbeM/VIiqQYMhoNvBPQBCH6ko+WW52iNHbFaKZIMec32o3 8ToxIjr7v6tXfA9XR5HUrvupzvMfBvrU/p8TOt5fdDS2CrcdmmN3NmnR RQpYYS0XUp+v54JonWyAU+4RU8AIHPE1OuE4zw0BmgTfS8VkdCgI0CHh oqZkNVi/Fhqxe6oEbmjfYv44k0tV25Xk12z2Cwok1WrjnCUIctVo54/3 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RjBuudxGrbXpwa1RT7vqVCOhuW/LzlnFjXuwi+ir3hfXP4Vq/e0E7dzs xjJMMCg9Pt8WY1TmJ+HcTTSB5IvBXY/CRpNzi6w4hKl5K7I/WAwuQ8NO IqyPNn83ilVGXAo7UPZQ1mgCkAoFstWuhSAXZdiHjMnq8csy3Ehi+JDL +4I=", "NS 8 3 3600 20260907105038 20260808105038 9528 sjtu.edu.cn. HmubHBE/OeH4bn1qj+7WoIy0A4GpaGzB5eBBH4odGix9FpNr8cH8JYNs LOMkdQyEBGwrHJ1CHxqKklGHN2VRkmt5IEGSC28rF2XaTI/b7ZkFUCK1 /rebdK17d0YR9oWAXmt6LHfJXjw5Ifvkn4Q57AFfp5fJjr4pDSEotLtD liA=", "DS 8 3 172800 20260818104027 20260804094215 44583 edu.cn. n2/T+FqHHeUO4TeNRh06aB3rftXunZruJysh1VYZoqJtOzIDq7Qnq33Z W+0iOwyUx7WuYxJ0H80akA31etFuXoMJMY3/h9bxoN79W7hDMOhnNhd0 yXGo88qvwj/WVUUn5BL1oXuxi3yWUWsD6tjn5mo6vXHc1vU2UnycUaN5 nSoYsR9/i0Y8UryuD5OatFxuXLK47StoioKdPUGTbpcjQ33bncpn7nsU dPVu9xtnKMnzbAmk7+tZrIX8h3RGe/J6xu+wHJn6Z1Oltnd3/eA5JdVS 3OGOLdzQfZw81rKOFkW7/QBPoCQXfmqvpy1KS0QSY2iuKtL8QZXwibwo cD4d3g==" ], "NSEC": [ "chall.0ops.sjtu.edu.cn. A NS SOA MX TXT RRSIG NSEC DNSKEY" ], "NSEC3": [], "SRV": [], "NAPTR": [], "TLSA": [], "SSHFP": [] }, "ipv4": [ "202.120.2.119" ], "ipv6": [] }, "mail": { "spf": "v=spf1 ip4:202.112.26.0/24 ip4:202.120.2.0/24 ip4:202.121.179.0/24 ip4:111.186.58.48 ip4:111.186.58.61 ip4:111.186.58.62 ip4:111.186.58.66 ip4:111.186.58.24 -all", "dmarc": "v=DMARC1; p=none;", "dkim_selector": "default", "dkim_host": "default._domainkey.sjtu.edu.cn", "dkim": "v=DKIM1; h=sha256; k=rsa; s=email; p=MIIBIjANBgkqhkiG9w0BAQEFAAOCAQ8AMIIBCgKCAQEA0qTydw3hTHRtxQEL6ivWgMgz2fE0O8dlyMccXBYZL0DWQc0jDZy5+HRhOMPT+WFvXii7mIJaCbpdP7ARuIYbE9zPTVHczHfqMM9TJCfjtxoa+YL6bB8Z8+i+J6EnXstpDJtWxcG1fQklXHxKILngwVKnkFowCre+xarKf5qal6q3tpkbctFNEo1wmIMQWE49jwIYMPW0qhwvtQrPaAvGfj2g2FQqFk4MfK8xS1i3fE2AGpkpxAFkkBVuH2bac2RIdd+Ypaf97KLdsLLNgcfcR1LqW+aKwCfVOps66Tlq2gmdofvFypwdF+1onAOwoOgR0YNhjInCWgEx6xFkhuRk0wIDAQAB", "spf_analysis": { "valid": true, "lookups": 0, "final": "-all", "message": "Within the estimated limit" }, "dmarc_analysis": { "valid": true, "policy": "none" }, "bimi": "", "mta_sts": "", "tls_rpt": "" }, "advanced": { "ptr": "www.sjtu.edu.cn", "propagation": { "consistent": true, "results": [ { "provider": "Google", "server": "8.8.8.8", "result": [ "202.120.2.119" ], "time_ms": 36.01 }, { "provider": "Cloudflare", "server": "1.1.1.1", "result": [ "202.120.2.119" ], "time_ms": 266.82 }, { "provider": "Quad9", "server": "9.9.9.9", "result": [ "202.120.2.119" ], "time_ms": 311.64 }, { "provider": "OpenDNS", "server": "208.67.222.222", "result": [ "202.120.2.119" ], "time_ms": 268.57 }, { "provider": "AdGuard", "server": "94.140.14.14", "result": [ "202.120.2.119" ], "time_ms": 307.97 } ] } }, "ssl": { "available": false, "issuer": "", "subject": "", "valid_from": "", "valid_to": "", "days_remaining": null, "san": [], "protocol": "", "cipher": "", "error": "Connection timed out" }, "http": { "url": "https://sjtu.edu.cn/", "status": "", "http_version": "0", "headers": [], "security_checks": { "strict-transport-security": false, "content-security-policy": false, "x-content-type-options": false, "x-frame-options": false, "referrer-policy": false, "permissions-policy": false, "cross-origin-opener-policy": false, "cross-origin-embedder-policy": false, "cross-origin-resource-policy": false }, "server": "", "powered_by": "" }, "webpage": { "url": "https://sjtu.edu.cn/", "title": "", "description": "", "success": false, "error": "Connection timeout after 5000 ms" }, "network": { "202.120.2.119": { "success": false, "country": "", "region": "", "city": "", "asn": "", "organization": "", "isp": "" } }, "smtp": { "host": "mx01.sjtu.edu.cn", "ports": [ { "port": 25, "open": false, "time_ms": 257.2, "banner": "", "error": "Connection refused" }, { "port": 465, "open": false, "time_ms": 4005.4, "banner": "", "error": "Connection timed out" }, { "port": 587, "open": false, "time_ms": 4262.7, "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": 91.62 }