{
    "ok": true,
    "domain": "ntu.edu.sg",
    "generated_at": "2026-08-09T04:51:52-05:00",
    "cache": {
        "hit": true,
        "ttl": 0
    },
    "score": {
        "total": 81,
        "label": "Good",
        "categories": {
            "dns": 70,
            "mail": 90,
            "security": 92,
            "network": 20,
            "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": "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": 0,
                "lost_points": 15,
                "detail": "Both DS and DNSKEY are required."
            },
            {
                "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": "81 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": 27,
                "lost_points": 8,
                "detail": "7 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": 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/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": "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": "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": "error",
                "title": "DNSSEC chain",
                "detail": "Both DS and DNSKEY are required.",
                "category": "dns",
                "max_points": 15,
                "earned_points": 0,
                "lost_points": 15
            },
            {
                "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": "81 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": "7 of 9 evaluated headers detected.",
                "category": "security",
                "max_points": 35,
                "earned_points": 27,
                "lost_points": 8
            },
            {
                "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": "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
            }
        ]
    },
    "dns": {
        "records": {
            "A": [
                "104.16.4.14"
            ],
            "AAAA": [],
            "CNAME": [],
            "MX": [
                "10 ntu.in.tmes.trendmicro.com."
            ],
            "TXT": [
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                "\"IGHDQK0R7ISP3IUX7MUU3LKLMT7793SIRZEKQQR3Z\"",
                "\"openatts a=dns-did; p=did:ethr:0x3d12104c4d77570636ae36d1cffc1cf563c781bb#controller; v=1.0;\"",
                "\"adobe-idp-site-verification=6eb5dd45be203d77958b56b17ef30f078f4ce799ed76dce89a36ab3096360bec\"",
                "\"6lwRPCZn=940d623d41ca8c8865e8c732bee52469\"",
                "\"Dynatrace-site-verification=7d0a2f11-c2de-46a9-a3cd-378cc5d1d07b__ila8hmgf1263v5hbrtvpa6d0mr\"",
                "\"_uc6m5qwgifde0wnuyjhfevmd0n0nwye\"",
                "\"atlassian-domain-verification=j0NuBrC3Fso4yjfiDyksZje3OOPtNEGkcVsauZvXoX7EMUMcXwTCkcwB/smoDnHv\"",
                "\"infoblox-domain-mastery=afb4e9a4797f404cf8b2c089b9f68bcd1f2fc88b8ee8fba44d25902bd483c953ca\"",
                "\"denodo-agora-domain-verification=ec56a43b-e7e0-4047-8fb1-30b05352d0ff\"",
                "\"openatts net=ethereum netId=1 addr=0x61783202d023fd08dcc7d7ca8a196697c46c9d57\"",
                "\"GVWSDN5OSCXAIOF04KMT5W8UPY4ZYRU6LR4G2INPT\"",
                "\"73B4FF3E2452F2D64C05726BDCE93D28BDF9710D\"",
                "\"apple-domain-verification=yfBH4Jn5hpLwAAMm\"",
                "\"MS=ms69007024\"",
                "\"d365mktkey=6xMa0vU71ZR2ixK5mG5UV5Ug1iKHb19h63fMefwmpiUx\"",
                "\"google-site-verification=paxVwUN60tJt34UY7d1tfPoxH4eRzr3n0ykB5rieXj8\"",
                "\"v=spf1\" \" ip4:155.69.5.218\" \" ip4:155.69.24.187\" \" ip4:155.69.25.226\" \" ip4:155.69.25.244\" \" ip4:155.69.5.242\" \" ip4:155.69.5.113\" \" ip4:149.56.182.220\" \" ip4:94.23.120.168\" \" ip4:23.251.233.28\" \" include:spfext.ntu.edu.sg\" \" include:spf.protection.outlook.com\" \" include:marketing.dynamics.com\" \" include:outboundmail.blackbaud.net\" \" include:7571598.spf05.hubspotemail.net\" \" include:sendgrid.net\" \" include:ap.rp.oracleemaildelivery.com\" \" include:amazonses.com\" \" -all\"",
                "\"amazonses:mBVPk6naV4iVXTFpT1XmYFQCGDWBfhDSi+4j8yZrsyc=\"",
                "\"vosaic-verification=VcBdIf5PDsf3coZ\"",
                "\"google-site-verification=B5pDvca0m9WKVnsXLHHY09vguc7jJC6NsT9T2CdTEGo\"",
                "\"facebook-domain-verification=dna9ern89lrik11avfttdh0q0mq6bp\"",
                "\"tmes=99be067df2982a59c87e33712dea44de\"",
                "\"openatts a=dns-did; p=did:ethr:0xb444a0ac5753a2684099c934bf4119b0bd8e35d3#controller; v=1.0;\"",
                "\"openatts net=ethereum netId=1 addr=0x6bf2602b25752c4e3785951e7b95196c1d3ab29d\"",
                "\"openatts net=ethereum netId=137 addr=0xb0bA40C99814ABF85b668bc37aBfBC5a26b343a8\"",
                "\"google-site-verification=q6eRV63xn_rWdNKmXu9pQT6D4zksWDbHffZOV13GA8Y\""
            ],
            "NS": [
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                "secdns2.cyberway.com.sg.",
                "ndc-dns-ext-01.ntu.edu.sg.",
                "secdns.cyberway.com.sg."
            ],
            "SOA": [
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            ],
            "CAA": [],
            "DS": [],
            "DNSKEY": [],
            "RRSIG": [],
            "NSEC": [],
            "NSEC3": [],
            "SRV": [],
            "NAPTR": [],
            "TLSA": [],
            "SSHFP": []
        },
        "ipv4": [
            "104.16.4.14"
        ],
        "ipv6": []
    },
    "mail": {
        "spf": "v=spf1 ip4:155.69.5.218 ip4:155.69.24.187 ip4:155.69.25.226 ip4:155.69.25.244 ip4:155.69.5.242 ip4:155.69.5.113 ip4:149.56.182.220 ip4:94.23.120.168 ip4:23.251.233.28 include:spfext.ntu.edu.sg include:spf.protection.outlook.com include:marketing.dynamics.com include:outboundmail.blackbaud.net include:7571598.spf05.hubspotemail.net include:sendgrid.net include:ap.rp.oracleemaildelivery.com include:amazonses.com -all",
        "dmarc": "v=DMARC1; p=quarantine; sp=quarantine; rua=mailto:postmaster@ntu.edu.sg; ruf=mailto:postmaster@ntu.edu.sg; ri=86400",
        "dkim_selector": "selector2",
        "dkim_host": "selector2._domainkey.ntu.edu.sg",
        "dkim": "v=DKIM1; k=rsa; p=MIIBIjANBgkqhkiG9w0BAQEFAAOCAQ8AMIIBCgKCAQEAr0b+16Ifhi/g+nQNKPzlRco1uF0N2/NTEsfOE7Lt0TYa2pojwT3+4CfEiiF6DnXBb0zPzNjIUJVncBUsP/hz2iw7HhsDEkbepoLXeyClyHHGTdc2lJBLe7C7rsMrbAG/3xYLpP7o4rRtoJuTT8vQlLIqbnJDhLXwp6GtJ9MeXOv9QpuAQvWheBUxKIEd48ANFpgc9YQTa+g4J719F/gLcJcUFnnODh/b4HFjUf2xoSnOJ66sR6QeeR+/Yvv/sxv9lRTlTNA8Ywwrars/khqfGT1kOoanpVLDQWAitYTJqzKOnq1H6lR63RPQVrrKhdzfm32R8/wt1h+p/PamJoqpHQIDAQAB;",
        "spf_analysis": {
            "valid": true,
            "lookups": 8,
            "final": "-all",
            "message": "Within the estimated limit"
        },
        "dmarc_analysis": {
            "valid": true,
            "policy": "quarantine"
        },
        "bimi": "",
        "mta_sts": "",
        "tls_rpt": ""
    },
    "advanced": {
        "ptr": "",
        "propagation": {
            "consistent": true,
            "results": [
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                    "provider": "Google",
                    "server": "8.8.8.8",
                    "result": [
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                    ],
                    "time_ms": 250.58
                },
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                    "provider": "Cloudflare",
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                    "result": [
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                    ],
                    "time_ms": 234.24
                },
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                    "result": [
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                    ],
                    "time_ms": 231.44
                },
                {
                    "provider": "OpenDNS",
                    "server": "208.67.222.222",
                    "result": [
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                    ],
                    "time_ms": 2080.76
                },
                {
                    "provider": "AdGuard",
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                    "result": [
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                    ],
                    "time_ms": 546.42
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    "ssl": {
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        "issuer": "Google Trust Services",
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        "valid_from": "2026-07-31T18:24:13-05:00",
        "valid_to": "2026-10-29T19:24:07-05:00",
        "days_remaining": 81,
        "san": [
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        "protocol": "TLSv1.3",
        "cipher": "TLS_AES_256_GCM_SHA384"
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            "age": "10474",
            "expires": "Sun, 09 Aug 2026 06:57:08 GMT",
            "last-modified": "Sun, 09 Aug 2026 05:10:17 GMT",
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