Infrastructure
· 9 checks — DNS, redirects, IPv6, crawlability, URL variants, and domain intelligence rolled into one auditable list.CIPv6 ReadinessActionNo IPv6 supportREVIEW
IPv6 support is increasingly important for global accessibility. About 40% of internet users have IPv6 connectivity.
No AAAA records — same impact as 'no IPv6 (AAAA) records'; IPv6-preferring clients pay extra latency falling back to IPv4.
Source: Google IPv6 stats
BURL Variantswww/non-www, trailing slash, HTTP→HTTPSREVIEW
www / non-www
Inconsistent — duplicate content risk
HTTP → HTTPS
Consistent
BTLS Certificate Expiry & Recommendations108 days until leaf cert expires — 3 issues to addressREVIEW
Certificate validity
Recommended actions
- Enable HSTS: Strict-Transport-Security: max-age=31536000; includeSubDomains
- Enable DNSSEC on your domain for DNS spoofing protection
- Enable OCSP stapling on your TLS server to remove a CA roundtrip and protect user privacy
A+DNS Records4 A records, 82 ms lookupPASS
| A | 52.54.86.12, 13.217.183.171, 54.81.159.5, 3.87.163.184 |
| AAAA | — |
| CNAME | — |
| NS | ns-473.awsdns-59.com, ns-659.awsdns-18.net, ns-1052.awsdns-03.org, ns-1629.awsdns-11.co.uk |
| MX | 10 aspmx3.googlemail.com 10 aspmx.l.google.com 20 alt1.aspmx.l.google.com 20 alt2.aspmx.l.google.com 30 aspmx2.googlemail.com |
| TXT | MS=ms40313232 status-page-domain-verification=pmfyw22rmcg9 intacct-esk=4FED1A49C4B8865AE053DF06A8C02878 1wnqjfbqpgk7rry20dzzcqmm0fhqpdwm SPF v=spf1 ip4:208.254.38.64/27 ip4:108.26.163.24 ip4:18.233.120.246 include:mail.ze... |
| CAA | Lookup not available with standard resolver |
CAA record lookup requires a specialized DNS resolver. This check will be available in a future update.
Informational: CAA (Certification Authority Authorization) records weren't checked in this scan.
A+Redirect ChainNo redirects — direct accessPASS
https://crossref.org
295 ms · HTTP/1.1 FINAL
| # | URL | Status | Time | Protocol | Server |
|---|---|---|---|---|---|
| 1 | https://crossref.org | 200 | 295 ms | HTTP/1.1 | AmazonS3 |
A+Crawlabilityrobots.txt present, sitemap with 1667 URLsPASS
Add a 'Sitemap:' directive to robots.txt so search engines can discover your sitemap.
robots.txt omits Sitemap: directive — crawlers must fetch /sitemap.xml by convention; reliable but missing the explicit hint.
Source: sitemaps.org
User-agent: *
Allow: /
Disallow: /_
Disallow: /help/_
Disallow: /apply/
- https://www.crossref.org/jobs/2026-03-05-technical-support-specialist/
- https://www.crossref.org/jobs/2025-11-13-communications-manager/
- https://www.crossref.org/members-area/
- https://www.crossref.org/jobs/2023-04-24-contract-member-support/
- https://www.crossref.org/jobs/2023-02-08-contract-software-development/
A+Domain Intelligencecrossref.org — via Register.com - Network Solutions, LLC, 26 years, 9 months old, hosted on AWSPASS
902 days
December 1, 2028
108 days
Issued by Amazon
26 years, 9 months
Registered December 1, 1999
Not enabled
Protects against DNS spoofing
AWS
ASN AS14618
52.54.86.12
Register.com - Network Solutions, LLC
Expiry timeline
Recommended actions
- Enable DNSSEC to protect visitors from DNS spoofing
- Enable registrar lock (clientTransferProhibited) to block unauthorized domain transfers
DNSSEC protects against DNS spoofing attacks. While not required, enabling DNSSEC adds an additional layer of security. Contact your DNS provider to enable it.
Without DNSSEC, an attacker who can poison your DNS can hijack your domain — and SSL certs alone don't stop them.
Learn more ▾ ▴
DNSSEC adds cryptographic signatures to DNS records, preventing forged responses from poisoning resolver caches. Without it, an attacker who controls the network path can redirect your domain to a malicious server before any HTTPS handshake happens. Most modern registrars (Cloudflare, Google Domains, Route 53) enable it with one toggle.
Source: ICANN / RFC 4033
The domain can be transferred without an unlock step. Enable registrar lock (clientTransferProhibited) in your registrar's control panel to protect against unauthorized or accidental transfers.
Without registrar lock, an attacker who phishes your registrar credentials can transfer the domain in minutes — total brand hijack.
Learn more ▾ ▴
Registrar lock (clientTransferProhibited, clientUpdateProhibited, clientDeleteProhibited) requires extra verification before any transfer/update/delete. Every major registrar offers it free. Combined with 2FA on your registrar account, it's the strongest defense against domain hijacking.
Source: ICANN / domain-security best practice