{
    "ok": true,
    "domain": "busuu.com",
    "generated_at": "2026-08-10T08:48:25-05:00",
    "cache": {
        "hit": true,
        "ttl": 0
    },
    "score": {
        "total": 80,
        "label": "Good",
        "categories": {
            "dns": 60,
            "mail": 90,
            "security": 81,
            "network": 65,
            "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": "4 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": 0,
                "lost_points": 10,
                "detail": "Agreement between public resolvers."
            },
            {
                "category": "mail",
                "title": "MX records",
                "max_points": 20,
                "earned_points": 20,
                "lost_points": 0,
                "detail": "2 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": "119 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": 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: server-18-154-110-37.ord58.r.cloudfront.net"
            },
            {
                "category": "network",
                "title": "IPv4 diversity",
                "max_points": 35,
                "earned_points": 35,
                "lost_points": 0,
                "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": "4 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": "error",
                "title": "DNS propagation",
                "detail": "Agreement between public resolvers.",
                "category": "dns",
                "max_points": 10,
                "earned_points": 0,
                "lost_points": 10
            },
            {
                "level": "ok",
                "title": "MX records",
                "detail": "2 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": "119 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,
                "earned_points": 16,
                "lost_points": 19
            },
            {
                "level": "ok",
                "title": "PTR reverse DNS",
                "detail": "PTR: server-18-154-110-37.ord58.r.cloudfront.net",
                "category": "network",
                "max_points": 30,
                "earned_points": 30,
                "lost_points": 0
            },
            {
                "level": "ok",
                "title": "IPv4 diversity",
                "detail": "Two or more IPv4 addresses receive full points.",
                "category": "network",
                "max_points": 35,
                "earned_points": 35,
                "lost_points": 0
            },
            {
                "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": [
                "18.154.110.37",
                "18.154.110.20",
                "18.154.110.76",
                "18.154.110.3"
            ],
            "AAAA": [],
            "CNAME": [],
            "MX": [
                "20 mxb-00360d01.gslb.pphosted.com.",
                "10 mxa-00360d01.gslb.pphosted.com."
            ],
            "TXT": [
                "\"v=DKIM1; k=rsa; v=DKIM1; k=rsa; p=MIGfMA0GCSqGSIb3DQEBAQUAA4GNADCBiQKBgQCuoJo9E/sGfYXox6a0fNes3wDT9eJLZH7xEh9uSV7qTiy8G/DWtdcCuDATrj4atH1dZeiolXef/kDqMDwx4T/aCJAP1kBDqGZ21c9dEczIKpR3kVslrtd1+B6CE7mKYChUJB251aBqWTcvWAcfqtCOeILrIVnh0qi+9nPRLNsLfQIDAQAB\"",
                "\"bitrise-verification=933f5ea344452d8f-P7GvogboAEbD\"",
                "\"stripe-verification=a4b6fdebd3c752f80dca48d8313c20f4df3ad179459ea12e5c4b99ae36e53c29\"",
                "\"mongodb-site-verification=WiT1OAJiSpGM6mwyicyrOrdICBzRCg5a\"",
                "\"google-site-verification=73uShR4Uz2WJmyOFZql8lB_PCIh-rtbazPjYtmYM6kU\"",
                "\"MS=ms44603965\"",
                "\"google-site-verification=iq7hRqWNxuz03xtoZThARMpPSpM9JuY7KhW3JvksDnc\"",
                "\"google-site-verification=tM-OQn_2wNQxp_uOje39Ybl7qpFzaMzovYjDqPwbCZo\"",
                "\"atlassian-domain-verification=YwlJ/bGike/cutqsk43lfRICqM3dakD2wqNHt70xbmp7CLky7BSVPvKmk9nNKFVO\"",
                "\"google-site-verification=Cng4vFgL2uN3oW_baWiihhJZni1rJyPKjsSHvuNLvYY\"",
                "\"atlassian-sending-domain-verification=f9d75d2f-1ef2-442f-8ca7-fab918fafdaf\"",
                "\"tripl2rlgpapjh9ivjpp2o8hpq\"",
                "\"atlassian-domain-verification=nQ3qEbbzY6quiUrpaq5DdtDmt0L2CRDC4+hG0pq9zdc41Jk+cpFZNIKNyhSL/fiT\"",
                "\"miro-verification=2a524b3b46742b6bb51133d4fb13dfbd3458b97c\"",
                "\"anthropic-domain-verification-th5kxd=ZGrO6oFd3XcdhDDeuIAzCzRAX\"",
                "\"stripe-verification=d12da281665e7c4f2d3191b5dd372662ee7b99221df556126a58d89393ebcc05\"",
                "\"v=DMARC1; p=quarantine; rua=mailto:it+dmarc@busuu.com pct=100; adkim=s; aspf=s\"",
                "\"cursor-domain-verification-tzeza3=QJvoyIKI2mUfAdg2U05JIbmxV\"",
                "\"_proofpoint-verification=a0342e4d-44ae-4517-8ff5-6468509c557d\"",
                "\"google-site-verification=IDbBDAi3MRGemSd1bPpcjMXp11Q3IrsWCj_hvKOhVKQ\"",
                "\"stripe-verification=eb16a29c47e29f90c02af92701e4b8a0992e2b7d9f2ab446fe9aa357ccb9d7c6\"",
                "\"apple-domain-verification=MWRUkH9Y5NyHsNJq\"",
                "\"v=spf1 include:%{ir}.%{v}.%{d}.spf.has.pphosted.com include:mail.zendesk.com -all\"",
                "\"google-site-verification=Zb3VZZt2V8rXVcBXmNa_X-sgIhYoXWHY7O_XK4CE7gs\""
            ],
            "NS": [
                "ns-801.awsdns-36.net.",
                "ns-1708.awsdns-21.co.uk.",
                "ns-123.awsdns-15.com.",
                "ns-1422.awsdns-49.org."
            ],
            "SOA": [
                "ns-1422.awsdns-49.org. awsdns-hostmaster.amazon.com. 1 7200 900 1209600 86400"
            ],
            "CAA": [],
            "DS": [],
            "DNSKEY": [],
            "RRSIG": [],
            "NSEC": [],
            "NSEC3": [],
            "SRV": [],
            "NAPTR": [],
            "TLSA": [],
            "SSHFP": []
        },
        "ipv4": [
            "18.154.110.37",
            "18.154.110.20",
            "18.154.110.76",
            "18.154.110.3"
        ],
        "ipv6": []
    },
    "mail": {
        "spf": "v=spf1 include:%{ir}.%{v}.%{d}.spf.has.pphosted.com include:mail.zendesk.com -all",
        "dmarc": "v=DMARC1; p=reject; fo=1; rua=mailto:dmarc_rua@emaildefense.proofpoint.com; ruf=mailto:dmarc_ruf@emaildefense.proofpoint.com",
        "dkim_selector": "default",
        "dkim_host": "default._domainkey.busuu.com",
        "dkim": "p=MHwwDQYJKoZIhvcNAQEBBQADawAwaAJhAJ/I7hGc4Y4E1XnSoKxlEfRRwyHk2cS2QDYTBFnNF6ZUG7+Uw4m6h3hmu/SDDVJn2i+1xaVnk3OgfDh42e6bYMrMnM4QFXtJhTUB/SDdmbTP/Pt/oHTRw115yyj9+Vp8/wIDAQAB",
        "spf_analysis": {
            "valid": true,
            "lookups": 2,
            "final": "-all",
            "message": "Within the estimated limit"
        },
        "dmarc_analysis": {
            "valid": true,
            "policy": "reject"
        },
        "bimi": "v=BIMI1; l=https://cdn.busuu.com/busuu-bimi.svg",
        "mta_sts": "",
        "tls_rpt": ""
    },
    "advanced": {
        "ptr": "server-18-154-110-37.ord58.r.cloudfront.net",
        "propagation": {
            "consistent": false,
            "results": [
                {
                    "provider": "Google",
                    "server": "8.8.8.8",
                    "result": [
                        "18.154.110.20",
                        "18.154.110.3",
                        "18.154.110.37",
                        "18.154.110.76"
                    ],
                    "time_ms": 111.29
                },
                {
                    "provider": "Cloudflare",
                    "server": "1.1.1.1",
                    "result": [
                        "18.154.110.20",
                        "18.154.110.3",
                        "18.154.110.37",
                        "18.154.110.76"
                    ],
                    "time_ms": 36.04
                },
                {
                    "provider": "Quad9",
                    "server": "9.9.9.9",
                    "result": [
                        "18.154.110.20",
                        "18.154.110.3",
                        "18.154.110.37",
                        "18.154.110.76"
                    ],
                    "time_ms": 51.76
                },
                {
                    "provider": "OpenDNS",
                    "server": "208.67.222.222",
                    "result": [
                        "18.154.110.20",
                        "18.154.110.3",
                        "18.154.110.37",
                        "18.154.110.76"
                    ],
                    "time_ms": 155.47
                },
                {
                    "provider": "AdGuard",
                    "server": "94.140.14.14",
                    "result": [
                        "3.166.96.115",
                        "3.166.96.30",
                        "3.166.96.37",
                        "3.166.96.78"
                    ],
                    "time_ms": 65.65
                }
            ]
        }
    },
    "ssl": {
        "available": true,
        "issuer": "Amazon",
        "subject": "busuu.com",
        "valid_from": "2026-05-23T19:00:00-05:00",
        "valid_to": "2026-12-07T17:59:59-06:00",
        "days_remaining": 119,
        "san": [
            "busuu.com",
            "*.busuu.com",
            "*.busuu.net",
            "*.internal.busuu.com"
        ],
        "protocol": "TLSv1.3",
        "cipher": "TLS_AES_128_GCM_SHA256"
    },
    "http": {
        "url": "https://www.busuu.com/",
        "status": "HTTP/2 200 ",
        "http_version": "3",
        "headers": {
            "content-type": "text/html;charset=UTF-8",
            "content-length": "169",
            "location": "https://www.busuu.com/",
            "server": "istio-envoy",
            "date": "Mon, 10 Aug 2026 11:13:20 GMT",
            "x-envoy-upstream-service-time": "576",
            "x-cache": "Hit from cloudfront",
            "via": "1.1 363cf6d942ab5b3d116a73566ddf9894.cloudfront.net (CloudFront)",
            "x-amz-cf-pop": "ORD58-P6",
            "alt-svc": "h3=\":443\"; ma=86400",
            "x-amz-cf-id": "OLV4S42LDPPq1rKGJrx_xcaDR89FKfJL-T4N9CPqTsnJN-2Iya-gZA==",
            "x-xss-protection": "1; mode=block",
            "x-frame-options": "SAMEORIGIN",
            "referrer-policy": "strict-origin-when-cross-origin",
            "x-content-type-options": "nosniff",
            "strict-transport-security": "max-age=31536000",
            "vary": "Accept-Encoding",
            "set-cookie": "grav-site-7f7febf=7f886a47ba539e2d819c4c1f0a958993; expires=Mon, 10 Aug 2026 13:13:19 GMT; Max-Age=7200; path=/; domain=www.busuu.com; secure; HttpOnly; SameSite=Lax",
            "pragma": "no-cache",
            "cache-control": "max-age=604800",
            "expires": "Mon, 17 Aug 2026 11:13:20 GMT",
            "etag": "\"b940055f3b9089728bf7c7e118547ce2\"",
            "access-control-allow-origin": "https://www.busuu.com",
            "access-control-allow-credentials": "true",
            "access-control-allow-headers": "Origin, X-Requested-With, Content-Type, Accept",
            "age": "9304"
        },
        "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": "istio-envoy",
        "powered_by": ""
    },
    "webpage": {
        "url": "https://www.busuu.com/",
        "title": "Busuu - Learn Languages Online: Start for Free",
        "description": "Study a new language online with Busuu's award-winning courses. Learn together with native speakers in Busuu's community.",
        "success": true,
        "error": "",
        "status": 200
    },
    "network": {
        "18.154.110.37": {
            "success": false,
            "country": "",
            "region": "",
            "city": "",
            "asn": "",
            "organization": "",
            "isp": ""
        },
        "18.154.110.20": {
            "success": false,
            "country": "",
            "region": "",
            "city": "",
            "asn": "",
            "organization": "",
            "isp": ""
        },
        "18.154.110.76": {
            "success": false,
            "country": "",
            "region": "",
            "city": "",
            "asn": "",
            "organization": "",
            "isp": ""
        },
        "18.154.110.3": {
            "success": false,
            "country": "",
            "region": "",
            "city": "",
            "asn": "",
            "organization": "",
            "isp": ""
        }
    },
    "smtp": {
        "host": "mxb-00360d01.gslb.pphosted.com",
        "ports": [
            {
                "port": 25,
                "open": false,
                "time_ms": 50.3,
                "banner": "",
                "error": "Connection refused"
            },
            {
                "port": 465,
                "open": false,
                "time_ms": 71.2,
                "banner": "",
                "error": "Connection refused"
            },
            {
                "port": 587,
                "open": false,
                "time_ms": 50.6,
                "banner": "",
                "error": "Connection refused"
            }
        ]
    },
    "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": 115.51
}