{ "ok": true, "domain": "grc.com", "generated_at": "2026-08-09T10:33:19-05:00", "cache": { "hit": true, "ttl": 0 }, "score": { "total": 78, "label": "Good", "categories": { "dns": 75, "mail": 90, "security": 65, "network": 50, "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": "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": 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": "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": "14 day(s) remaining." }, { "category": "security", "title": "Certificate lifetime", "max_points": 10, "earned_points": 2, "lost_points": 8, "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": 30, "lost_points": 0, "detail": "PTR: grc.com" }, { "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/1.1 200 OK" }, { "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": "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": "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": "14 day(s) remaining.", "category": "security", "max_points": 55, "earned_points": 55, "lost_points": 0 }, { "level": "warning", "title": "Certificate lifetime", "detail": "Full points require at least 30 days remaining.", "category": "security", "max_points": 10, "earned_points": 2, "lost_points": 8 }, { "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": "ok", "title": "PTR reverse DNS", "detail": "PTR: grc.com", "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": "ok", "title": "HTTP response", "detail": "HTTP/1.1 200 OK", "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": [ "4.79.142.200" ], "AAAA": [], "CNAME": [], "MX": [ "10 grc.com." ], "TXT": [ "\"v=spf1 ip4:4.79.142.192/28 a:client.grc.com a:grc.com -all\"", "\"_e9izydias4fdktb7grdz8lx129rf0kz\"", "\"google-site-verification=lTHvpojcfPIYXGkOqbku5TcOkpo52Exo-qWuQJi5bpw\"", "\"_bpovimyxhv2xbvowiwnvlkhz27b4z4f\"", "\"7pdq8vl28psslbzzx8g9s3pbwjvksk24\"" ], "NS": [ "ns3.level3.net.", "ns4.level3.net." ], "SOA": [ "grc.com. dns2005.grc.com. 2026072408 14400 300 5184000 14400" ], "CAA": [ "0 issue \"digicert.com\"" ], "DS": [], "DNSKEY": [], "RRSIG": [], "NSEC": [], "NSEC3": [], "SRV": [], "NAPTR": [], "TLSA": [], "SSHFP": [] }, "ipv4": [ "4.79.142.200" ], "ipv6": [] }, "mail": { "spf": "v=spf1 ip4:4.79.142.192/28 a:client.grc.com a:grc.com -all", "dmarc": "v=DMARC1; p=reject; sp=reject; rua=mailto:re+2d18e30bd27e@inbound.dmarcdigests.com; adkim=s; aspf=s; fo=1; pct=100", "dkim_selector": "dkim", "dkim_host": "dkim._domainkey.grc.com", "dkim": "v=DKIM1;k=rsa;p=MIIBIjANBgkqhkiG9w0BAQEFAAOCAQ8AMIIBCgKCAQEApWmZrfy5xHlos6DDOeMDmEIDdysdag/1RTMc0jWKrhJH2kucIjxp4RcxaPh0ZqpIA/VqTSFVjgEddkpHqjh2nerwDtlwVPjwkccXYJVo61FpVqErCFFgLfhEqWoXW26x4D2x00RdQ2B3308la0BjWnV3y59OCmumon2B6LWHLW3hX4UUc1uz261I/2/x1jpHvO2zuckDq5uTcIOUqS1+RZeCospr9xodV9fTyQ33ol4oCyNJF0GyAvWQFJnfD81GCxgkYO4ATuDtndBdoYoCN6pjRceT5pLPKMe99KisoEa2191R/sxNFd76cfWAMwPewxnjGG05YBuosfx9wsjZcQIDAQAB", "spf_analysis": { "valid": true, "lookups": 2, "final": "-all", "message": "Within the estimated limit" }, "dmarc_analysis": { "valid": true, "policy": "reject" }, "bimi": "v=BIMI1;l=https://vmc.digicert.com/01189704-9dc1-41c4-9340-caf345cdb53c.svg;a=https://vmc.digicert.com/01189704-9dc1-41c4-9340-caf345cdb53c.pem", "mta_sts": "", "tls_rpt": "" }, "advanced": { "ptr": "grc.com", "propagation": { "consistent": true, "results": [ { "provider": "Google", "server": "8.8.8.8", "result": [ "4.79.142.200" ], "time_ms": 46.8 }, { "provider": "Cloudflare", "server": "1.1.1.1", "result": [ "4.79.142.200" ], "time_ms": 49.8 }, { "provider": "Quad9", "server": "9.9.9.9", "result": [ "4.79.142.200" ], "time_ms": 103.5 }, { "provider": "OpenDNS", "server": "208.67.222.222", "result": [ "4.79.142.200" ], "time_ms": 50.35 }, { "provider": "AdGuard", "server": "94.140.14.14", "result": [ "4.79.142.200" ], "time_ms": 103.35 } ] } }, "ssl": { "available": true, "issuer": "DigiCert Inc", "subject": "grc.com", "valid_from": "2025-07-22T19:00:00-05:00", "valid_to": "2026-08-23T18:59:59-05:00", "days_remaining": 14, "san": [ "grc.com", "*.grc.com", "grctech.com", "*.grctech.com", "grc.sc", "breath.cafe", "biotech.cafe" ], "protocol": "TLSv1.2", "cipher": "ECDHE-RSA-AES256-SHA384" }, "http": { "url": "https://www.grc.com/intro.htm", "status": "HTTP/1.1 200 OK", "http_version": "2", "headers": { "content-length": "12600", "location": "https://www.grc.com/intro.htm", "access-control-allow-origin": "*", "x-frame-options": "SAMEORIGIN", "strict-transport-security": "max-age=31536000; preload", "server": "GRC/IIS Hybrid Application Webserver", "date": "Sun, 09 Aug 2026 15:33:14 GMT", "content-type": "text/html; charset=utf-8", "expires": "Mon, 01 Jan 1990 00:00:00 GMT", "p3p": "CP=\"NOI DSP COR NID NOR\"", "set-cookie": "ppag=arudcwuvyaze1; path=/; expires=Mon, 01-Jan-2046 00:00:00 GMT", "connection": "close" }, "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": "GRC/IIS Hybrid Application Webserver", "powered_by": "" }, "webpage": { "url": "https://www.grc.com/intro.htm", "title": "  Home of Gibson Research Corporation  ", "description": "Steve Gibson's and Gibson Research Corporation's Web homepage.", "success": true, "error": "", "status": 200 }, "network": { "4.79.142.200": { "success": false, "country": "", "region": "", "city": "", "asn": "", "organization": "", "isp": "" } }, "smtp": { "host": "grc.com", "ports": [ { "port": 25, "open": false, "time_ms": 0.6, "banner": "", "error": "Connection refused" }, { "port": 465, "open": false, "time_ms": 60.8, "banner": "", "error": "No connection" }, { "port": 587, "open": false, "time_ms": 58.7, "banner": "", "error": "No connection" } ] }, "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": 108.9 }