{ "ok": true, "domain": "crossref.org", "generated_at": "2026-08-09T03:54:36-05:00", "cache": { "hit": true, "ttl": 0 }, "score": { "total": 80, "label": "Good", "categories": { "dns": 75, "mail": 90, "security": 65, "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": 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": "137 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": 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: ec2-3-215-11-22.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": 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": "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": "137 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": "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: ec2-3-215-11-22.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": "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": [ "3.215.11.22", "100.62.15.43", "54.175.2.164", "32.193.126.239" ], "AAAA": [], "CNAME": [], "MX": [ "10 aspmx3.googlemail.com.", "10 aspmx.l.google.com.", "20 alt2.aspmx.l.google.com.", "30 aspmx2.googlemail.com.", "20 alt1.aspmx.l.google.com." ], "TXT": [ "\"v=spf1 ip4:208.254.38.64/27 ip4:108.26.163.24 ip4:18.233.120.246 include:mail.zendesk.com include:stspg-customer.com include:_spf.google.com include:_spf.intacct.com include:amazonses.com include:_spf.act-on.net ~all\"", "\"intacct-esk=4FED1A49C4B8865AE053DF06A8C02878\"", "\"MS=ms40313232\"", "\"status-page-domain-verification=pmfyw22rmcg9\"", "\"1wnqjfbqpgk7rry20dzzcqmm0fhqpdwm\"" ], "NS": [ "ns-473.awsdns-59.com.", "ns-1052.awsdns-03.org.", "ns-659.awsdns-18.net.", "ns-1629.awsdns-11.co.uk." ], "SOA": [ "ns-1052.awsdns-03.org. awsdns-hostmaster.amazon.com. 1 7200 900 1209600 86400" ], "CAA": [ "0 issue \"letsencrypt.org\"", "0 issue \"amazontrust.com\"", "0 issuewild \"letsencrypt.org\"", "0 issuewild \"amazontrust.com\"" ], "DS": [], "DNSKEY": [], "RRSIG": [], "NSEC": [], "NSEC3": [], "SRV": [], "NAPTR": [], "TLSA": [], "SSHFP": [] }, "ipv4": [ "3.215.11.22", "100.62.15.43", "54.175.2.164", "32.193.126.239" ], "ipv6": [] }, "mail": { "spf": "v=spf1 ip4:208.254.38.64/27 ip4:108.26.163.24 ip4:18.233.120.246 include:mail.zendesk.com include:stspg-customer.com include:_spf.google.com include:_spf.intacct.com include:amazonses.com include:_spf.act-on.net ~all", "dmarc": "v=DMARC1;p=none;sp=none;adkim=r;aspf=r;rua=mailto:dmarc@crossref.org;ruf=mailto:dmarc@crossref.org;fo=1", "dkim_selector": "google", "dkim_host": "google._domainkey.crossref.org", "dkim": "v=DKIM1; k=rsa; p=MIGfMA0GCSqGSIb3DQEBAQUAA4GNADCBiQKBgQCqW8tZ31pYBYBd1h5GE1vl10jKU4blmaK5Xi9r7chZWrwseCFy0CtIlCJ9vinDjvZ5wT3Ss5mol4vbg20TNru1S5MidMzgTlrTwOgi+0ADSf2oEk0XxFYnbIFRCU4GQGV2jnWUiLdAJuD5c/ffvwv7h9NZyVSF1foUhEuoADbv3QIDAQAB", "spf_analysis": { "valid": true, "lookups": 6, "final": "~all", "message": "Within the estimated limit" }, "dmarc_analysis": { "valid": true, "policy": "none" }, "bimi": "", "mta_sts": "", "tls_rpt": "" }, "advanced": { "ptr": "ec2-3-215-11-22.compute-1.amazonaws.com", "propagation": { "consistent": true, "results": [ { "provider": "Google", "server": "8.8.8.8", "result": [ "100.62.15.43", "3.215.11.22", "32.193.126.239", "54.175.2.164" ], "time_ms": 53.99 }, { "provider": "Cloudflare", "server": "1.1.1.1", "result": [ "100.62.15.43", "3.215.11.22", "32.193.126.239", "54.175.2.164" ], "time_ms": 53.09 }, { "provider": "Quad9", "server": "9.9.9.9", "result": [ "100.62.15.43", "3.215.11.22", "32.193.126.239", "54.175.2.164" ], "time_ms": 51.21 }, { "provider": "OpenDNS", "server": "208.67.222.222", "result": [ "100.62.15.43", "3.215.11.22", "32.193.126.239", "54.175.2.164" ], "time_ms": 87.74 }, { "provider": "AdGuard", "server": "94.140.14.14", "result": [ "100.62.15.43", "3.215.11.22", "32.193.126.239", "54.175.2.164" ], "time_ms": 104.11 } ] } }, "ssl": { "available": true, "issuer": "Amazon", "subject": "crossref.org", "valid_from": "2026-06-09T19:00:00-05:00", "valid_to": "2026-12-24T17:59:59-06:00", "days_remaining": 137, "san": [ "crossref.org" ], "protocol": "TLSv1.3", "cipher": "TLS_AES_128_GCM_SHA256" }, "http": { "url": "https://crossref.org/", "status": "HTTP/2 200 ", "http_version": "3", "headers": { "date": "Sun, 09 Aug 2026 08:54:28 GMT", "content-type": "text/html", "content-length": "35163", "last-modified": "Thu, 06 Aug 2026 14:16:32 GMT", "etag": "\"7103968ab408866364dde7a1d1d2754f\"", "x-amz-server-side-encryption": "AES256", "accept-ranges": "bytes", "server": "AmazonS3", "x-cache": "Hit from cloudfront", "via": "1.1 7061970d093e4cb5d937970a2a5dcce0.cloudfront.net (CloudFront)", "x-amz-cf-pop": "IAD61-P8", "x-amz-cf-id": "ywJPUD_woCejtUJkwkRRqcxiH6_n87S1_e8VA6FO5yMpkTssRUcmxg==", "age": "67032" }, "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": "AmazonS3", "powered_by": "" }, "webpage": { "url": "https://crossref.org/", "title": "Crossref", "description": "Crossref is open infrastructure linking the world's research. 25,000+ members, 167 countries, 2.1 billion monthly API queries.", "success": true, "error": "", "status": 200 }, "network": { "3.215.11.22": { "success": false, "country": "", "region": "", "city": "", "asn": "", "organization": "", "isp": "" }, "100.62.15.43": { "success": false, "country": "", "region": "", "city": "", "asn": "", "organization": "", "isp": "" }, "54.175.2.164": { "success": false, "country": "", "region": "", "city": "", "asn": "", "organization": "", "isp": "" }, "32.193.126.239": { "success": false, "country": "", "region": "", "city": "", "asn": "", "organization": "", "isp": "" } }, "smtp": { "host": "aspmx3.googlemail.com", "ports": [ { "port": 25, "open": false, "time_ms": 1.3, "banner": "", "error": "Network is unreachable" }, { "port": 465, "open": false, "time_ms": 4020.8, "banner": "", "error": "Connection timed out" }, { "port": 587, "open": false, "time_ms": 4021.1, "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": 99.04 }