{
    "ok": true,
    "domain": "zulip.com",
    "generated_at": "2026-08-12T08:39:12-05:00",
    "cache": {
        "hit": true,
        "ttl": 0
    },
    "score": {
        "total": 90,
        "label": "Excellent",
        "categories": {
            "dns": 85,
            "mail": 90,
            "security": 84,
            "network": 100,
            "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": "6 IPv4 address(es) detected."
            },
            {
                "category": "dns",
                "title": "IPv6 (AAAA)",
                "max_points": 10,
                "earned_points": 10,
                "lost_points": 0,
                "detail": "6 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": 5,
                "lost_points": 0,
                "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": "5 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": "205 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": 19,
                "lost_points": 16,
                "detail": "5 of 9 evaluated headers detected."
            },
            {
                "category": "network",
                "title": "PTR reverse DNS",
                "max_points": 30,
                "earned_points": 30,
                "lost_points": 0,
                "detail": "PTR: ec2-98-85-29-90.compute-1.amazonaws.com"
            },
            {
                "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": 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": "6 IPv4 address(es) detected.",
                "category": "dns",
                "max_points": 30,
                "earned_points": 30,
                "lost_points": 0
            },
            {
                "level": "ok",
                "title": "IPv6 (AAAA)",
                "detail": "6 IPv6 address(es) detected.",
                "category": "dns",
                "max_points": 10,
                "earned_points": 10,
                "lost_points": 0
            },
            {
                "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": "ok",
                "title": "CAA policy",
                "detail": "Certificate authority restriction.",
                "category": "dns",
                "max_points": 5,
                "earned_points": 5,
                "lost_points": 0
            },
            {
                "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": "5 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": "205 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": "5 of 9 evaluated headers detected.",
                "category": "security",
                "max_points": 35,
                "earned_points": 19,
                "lost_points": 16
            },
            {
                "level": "ok",
                "title": "PTR reverse DNS",
                "detail": "PTR: ec2-98-85-29-90.compute-1.amazonaws.com",
                "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": "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": [
                "98.85.29.90",
                "98.95.244.83",
                "107.21.148.168",
                "34.198.85.174",
                "52.7.187.7",
                "107.22.210.127"
            ],
            "AAAA": [
                "2600:1f18:414:db16:8299:980f:c2c0:7c40",
                "2600:1f18:414:db32:6d34:fa2f:19e0:e78c",
                "2600:1f18:414:db64:dcaa:70da:e5b1:1207",
                "2600:1f18:414:db00:67ba:dcd1:fcfc:9dd4",
                "2600:1f18:414:db80:f503:33ee:360d:c86d",
                "2600:1f18:414:db48:b337:f5f0:200f:f83b"
            ],
            "CNAME": [],
            "MX": [
                "5 alt2.aspmx.l.google.com.",
                "1 aspmx.l.google.com.",
                "5 alt1.aspmx.l.google.com.",
                "10 aspmx2.googlemail.com.",
                "10 aspmx3.googlemail.com."
            ],
            "TXT": [
                "\"google-site-verification=PM2i77lQZbZ41LSxXD5v4y7g7CE0LFXdJdYy3ejfuow\"",
                "\"abuseipdb-verification=zuewz0Gw\"",
                "\"google-site-verification=3Es_BXEZ7HqL0XycxzjS9N4GQcC6k7dG4DPaxvl-WUQ\"",
                "\"google-site-verification=9Jv0wj8luedHthbKsLItU6B2HpdPeynsMOD41km1VqY\"",
                "\"v=spf1 include:_spf.google.com include:amazonses.com include:mailgun.org -all\"",
                "\"MS=A39F8513BE669C8E81B8A81F4623ACA149454E87\""
            ],
            "NS": [
                "ns-1206.awsdns-22.org.",
                "ns-1854.awsdns-39.co.uk.",
                "ns-806.awsdns-36.net.",
                "ns-427.awsdns-53.com."
            ],
            "SOA": [
                "ns-806.awsdns-36.net. awsdns-hostmaster.amazon.com. 2021022301 7200 900 1209600 86400"
            ],
            "CAA": [
                "0 issue \"letsencrypt.org\"",
                "0 issue \"amazontrust.com\""
            ],
            "DS": [],
            "DNSKEY": [],
            "RRSIG": [],
            "NSEC": [],
            "NSEC3": [],
            "SRV": [],
            "NAPTR": [],
            "TLSA": [],
            "SSHFP": []
        },
        "ipv4": [
            "98.85.29.90",
            "98.95.244.83",
            "107.21.148.168",
            "34.198.85.174",
            "52.7.187.7",
            "107.22.210.127"
        ],
        "ipv6": [
            "2600:1f18:414:db16:8299:980f:c2c0:7c40",
            "2600:1f18:414:db32:6d34:fa2f:19e0:e78c",
            "2600:1f18:414:db64:dcaa:70da:e5b1:1207",
            "2600:1f18:414:db00:67ba:dcd1:fcfc:9dd4",
            "2600:1f18:414:db80:f503:33ee:360d:c86d",
            "2600:1f18:414:db48:b337:f5f0:200f:f83b"
        ]
    },
    "mail": {
        "spf": "v=spf1 include:_spf.google.com include:amazonses.com include:mailgun.org -all",
        "dmarc": "v=DMARC1; p=reject",
        "dkim_selector": "google",
        "dkim_host": "google._domainkey.zulip.com",
        "dkim": "v=DKIM1; k=rsa; p=MIIBIjANBgkqhkiG9w0BAQEFAAOCAQ8AMIIBCgKCAQEAljxFt/R4ttaj3ZIBDBQwKYs2z/KzbOuOXTGOW0dYNIjWnELq4Z9oE84G+RBhzkEIRMjabTJy9K/nhXhq2KGYlyCZRoNH1RldROXuhGszZX9jTpRD4XAuMBMAbSjgx0ujqQSifbKwlZy7U0iKjukX2y19NPovgG8MYSBI5BBCq39c79dP1+U4rx9IQeSkvLEoPuoGfoa5ZV7jVRnPtMb/H/sYa4s9JDirs1rdTXG+FA/Ilpvpdnn4uh4UjxF1vCErTefiJ7beb1Zg4dtSA9e83cvdqMlQRvSqWWyysZla1r6zLM5Ukxyr5kZplk9hWgrcp1pZkbH2n8/DVrZuPLtLxwIDAQAB",
        "spf_analysis": {
            "valid": true,
            "lookups": 3,
            "final": "-all",
            "message": "Within the estimated limit"
        },
        "dmarc_analysis": {
            "valid": true,
            "policy": "reject"
        },
        "bimi": "v=BIMI1;l=https://static.zulip.com/static/images/logo/zulip-icon-bimi.svg",
        "mta_sts": "",
        "tls_rpt": ""
    },
    "advanced": {
        "ptr": "ec2-98-85-29-90.compute-1.amazonaws.com",
        "propagation": {
            "consistent": true,
            "results": [
                {
                    "provider": "Google",
                    "server": "8.8.8.8",
                    "result": [
                        "107.21.148.168",
                        "107.22.210.127",
                        "34.198.85.174",
                        "52.7.187.7",
                        "98.85.29.90",
                        "98.95.244.83"
                    ],
                    "time_ms": 100.61
                },
                {
                    "provider": "Cloudflare",
                    "server": "1.1.1.1",
                    "result": [
                        "107.21.148.168",
                        "107.22.210.127",
                        "34.198.85.174",
                        "52.7.187.7",
                        "98.85.29.90",
                        "98.95.244.83"
                    ],
                    "time_ms": 54.1
                },
                {
                    "provider": "Quad9",
                    "server": "9.9.9.9",
                    "result": [
                        "107.21.148.168",
                        "107.22.210.127",
                        "34.198.85.174",
                        "52.7.187.7",
                        "98.85.29.90",
                        "98.95.244.83"
                    ],
                    "time_ms": 78.15
                },
                {
                    "provider": "OpenDNS",
                    "server": "208.67.222.222",
                    "result": [
                        "107.21.148.168",
                        "107.22.210.127",
                        "34.198.85.174",
                        "52.7.187.7",
                        "98.85.29.90",
                        "98.95.244.83"
                    ],
                    "time_ms": 120.72
                },
                {
                    "provider": "AdGuard",
                    "server": "94.140.14.14",
                    "result": [
                        "107.21.148.168",
                        "107.22.210.127",
                        "34.198.85.174",
                        "52.7.187.7",
                        "98.85.29.90",
                        "98.95.244.83"
                    ],
                    "time_ms": 90.15
                }
            ]
        }
    },
    "ssl": {
        "available": true,
        "issuer": "Amazon",
        "subject": "zulip.com",
        "valid_from": "2026-02-03T18:00:00-06:00",
        "valid_to": "2027-03-05T17:59:59-06:00",
        "days_remaining": 205,
        "san": [
            "zulip.com",
            "*.zulip.com"
        ],
        "protocol": "TLSv1.3",
        "cipher": "TLS_AES_128_GCM_SHA256"
    },
    "http": {
        "url": "https://zulip.com/",
        "status": "HTTP/2 200 ",
        "http_version": "3",
        "headers": {
            "date": "Wed, 12 Aug 2026 13:39:03 GMT",
            "content-type": "text/html; charset=utf-8",
            "content-length": "49682",
            "server": "nginx/1.24.0 (Ubuntu)",
            "vary": "Accept-Language, Cookie",
            "content-language": "en",
            "strict-transport-security": "max-age=31536000; includeSubdomains; preload",
            "x-frame-options": "DENY",
            "x-content-type-options": "nosniff",
            "referrer-policy": "strict-origin-when-cross-origin",
            "cross-origin-opener-policy": "same-origin"
        },
        "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": true,
            "cross-origin-embedder-policy": false,
            "cross-origin-resource-policy": false
        },
        "server": "nginx/1.24.0 (Ubuntu)",
        "powered_by": ""
    },
    "webpage": {
        "url": "https://zulip.com/",
        "title": "Zulip — organized team chat",
        "description": "Zulip is an organized team chat app for distributed\n  teams of all sizes.",
        "success": true,
        "error": "",
        "status": 200
    },
    "network": {
        "98.85.29.90": {
            "success": false,
            "country": "",
            "region": "",
            "city": "",
            "asn": "",
            "organization": "",
            "isp": ""
        },
        "98.95.244.83": {
            "success": false,
            "country": "",
            "region": "",
            "city": "",
            "asn": "",
            "organization": "",
            "isp": ""
        },
        "107.21.148.168": {
            "success": false,
            "country": "",
            "region": "",
            "city": "",
            "asn": "",
            "organization": "",
            "isp": ""
        },
        "34.198.85.174": {
            "success": false,
            "country": "",
            "region": "",
            "city": "",
            "asn": "",
            "organization": "",
            "isp": ""
        }
    },
    "smtp": {
        "host": "alt2.aspmx.l.google.com",
        "ports": [
            {
                "port": 25,
                "open": false,
                "time_ms": 0.8,
                "banner": "",
                "error": "Network is unreachable"
            },
            {
                "port": 465,
                "open": false,
                "time_ms": 4015.3,
                "banner": "",
                "error": "Connection timed out"
            },
            {
                "port": 587,
                "open": false,
                "time_ms": 4020,
                "banner": "",
                "error": "Connection timed out"
            }
        ]
    },
    "visitor": {
        "ip": "216.73.216.212",
        "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": 81.86
}