clustal.org website report
Attention Required! | Cloudflare
Last scanned · 1 view
Overall score
Great
About clustal.org
clustal.org is a website. The site is hosted on Cloudflare.
Score profile
Top issues to fix
9 issues found · 3 high priority
Missing Strict-Transport-Security header
SecurityAdd HSTS so browsers always use HTTPS — this closes the protocol-downgrade attack window.
Missing Content-Security-Policy header
SecurityAdd a CSP to control which sources can run scripts — the strongest single defense against XSS.
Missing meta description
SEOAdd a ~150-character meta description to control your search-result snippet and lift click-through rate.
Missing X-Content-Type-Options header
SecurityAdd X-Content-Type-Options: nosniff to stop MIME-sniffing attacks.
Missing canonical link
SEOAdd <link rel="canonical"> so search engines know which URL variant to index.
No structured data (JSON-LD) found
SEOAdd JSON-LD (Organization, Article, Product…) to become eligible for rich results.
+3 more issues — details in the sections below.
How it compares
clustal.org scores higher overall than 50% of the 163,243 sites we have scanned.
vs. All scanned sites
163,243 sitesThe dot is this site; the tick is the typical (median) score for the group. The number on the right is the percentile: the share of the group this site scores above.
Technology stack
No technologies were detected in the latest scan.
Hosting & DNS
clustal.org is hosted on and delivered through Cloudflare (servers registered in US).
- IP address
- 104.26.3.44
- ASN
- AS13335 · CLOUDFLARENET - Cloudflare, Inc., US
- IPv6
- Supported
- HTTP
- HTTP/2
Show DNS record values
- A
- 104.26.3.44, 104.26.2.44, 172.67.69.184
- AAAA
- 2606:4700:20::ac43:45b8, 2606:4700:20::681a:32c, 2606:4700:20::681a:22c
TXT record contents are not republished; only their count is shown.
Security
clustal.org uses TLS 1.3 with a certificate valid for 70 more days and sets 2 of 6 recommended security headers.
Security headers2 of 6 set
- HSTSForces HTTPS
- CSPBlocks injected scripts
- X-Frame-OptionsStops clickjacking
- X-Content-TypeStops MIME sniffing
- Referrer-PolicyLimits URL leakage
- Permissions-PolicyRestricts browser features
TLS certificate
- Names covered
- 2
- Cookies set
- 0
Email security
clustal.org scores B for email security, with SPF and DMARC policy “reject”.
- SPFGood
Rejects senders not listed (-all).
- DMARCGood
Forged mail is rejected; reports are collected.
- MTA-STSNot set
Not published; mail to this domain can be downgraded to plaintext.
- BIMINot set
Not published (optional).
Mail services authorised in SPF: Google Workspace
Performance & carbon
clustal.org scores 100/100 for performance, with an estimated load time of 0.0 s. A visit emits an estimated 0.00 g of CO2 (grade A+).
Page weight
- HTML 5.4 KB
- JavaScript 1.5 KB
- CSS 24 B
- Est. load
- 10 ms
- Response
- 10 ms
- Scripts / CSS
- 4 / 1
Carbon per visitA+
0.00 g CO2 per uncached view
Estimate from the Sustainable Web Design model. HTML, JavaScript and CSS only; images, video and fonts are not measured. Treat it as a lower bound for comparing pages, not an audit.
SEO & accessibility
clustal.org scores 60/100 for SEO and 100/100 for accessibility, with 6 SEO issues to fix.
Heading structure
One H1: good.
Image alt text
0 images · 0 without alt text · 0 lazy-loaded
Links
- External 1
SEO issues6
- Missing meta description
- Missing canonical link
- No structured data (JSON-LD) found
- Missing OpenGraph tags
- robots.txt not found
- sitemap.xml not found
Accessibility issues0
No accessibility issues detected.
Technical details
Page metadata, social tags, crawl files and scan information.
Meta tags
- Title
- Attention Required! | Cloudflare
- Description
- Canonical
- Language
- en-US
- Robots meta
- noindex, nofollow
Crawl files
- robots.txt
- Not found
- Disallow rules
- 0
- sitemap.xml
- Not found
- URLs in sitemap
- 0
Structured data
No JSON-LD types declared.
- Microdata items
- 0
- RDFa items
- 0
Scan
- Final URL
- https://www.clustal.org/
- HTTP status
- 403
- Redirects
- https://clustal.org → https://www.clustal.org/
- Scanned
- Aug 24, 2026, 1:22 PM
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<a href="https://sitegraph.tech/site/clustal-org"><img src="https://sitegraph.tech/badge/clustal-org.svg" alt="clustal.org on SiteGraph" width="190" height="20" /></a>See something wrong on this report? Request a correction or ask for something to be removed.
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Frequently asked questions about clustal.org
- What is clustal.org?
- clustal.org is a website. The site is hosted on Cloudflare.
- Who hosts clustal.org?
- clustal.org is hosted on and delivered through Cloudflare (servers registered in US).
- Is clustal.org secure?
- clustal.org uses TLS 1.3 with a certificate valid for 70 more days and sets 2 of 6 recommended security headers.
- Is clustal.org protected against email spoofing?
- clustal.org scores B for email security, with SPF and DMARC policy “reject”.
- How does clustal.org compare with similar sites?
- clustal.org scores higher overall than 50% of the 163,243 sites we have scanned.
- What is clustal.org's overall score?
- clustal.org has an overall SiteGraph score of 82/100, combining SEO (60), performance (100), security (75) and accessibility (100).
Open Graph & Twitter