clingendael.org
Home | Clingendael
Last scanned Jul 26, 2026, 2:19 PM
Overall score
Great
Summary
This website uses Drupal behind Cloudflare CDN. SEO is fair (55/100) and accessibility is excellent (90/100). Security scores excellent (100/100) and performance excellent (90/100). Top issue: Missing meta description.
Top issues to fix
7 issues found · 2 high priority
Missing meta description
SEOAdd a ~150-character meta description to control your search-result snippet and lift click-through rate.
No H1 heading found
SEOAdd exactly one H1 describing the page's main topic — it anchors the document outline for search engines and screen readers.
No structured data (JSON-LD) found
SEOAdd JSON-LD (Organization, Article, Product…) to become eligible for rich results.
Missing OpenGraph tags
SEOAdd og:title/og:description/og:image so shared links render a proper preview card.
robots.txt not found
SEOPublish /robots.txt with a Sitemap: directive to guide crawlers.
sitemap.xml not found
SEOPublish an XML sitemap and reference it from robots.txt to speed up page discovery.
+1 more issue — details in the sections below.
SEO
6 issue(s) found
Performance
1.70 s
Security
HTTPS & header checks
Accessibility
1 issue(s) found
Organization
Company details published in this site's own structured data.
Contact
Email, phone, and address published on this site's own pages.
- Phone
- (+31)70-324 53 84
Meta tags
- Title
- Home | Clingendael
- Description
- Canonical
- https://www.clingendael.org/
- Language
- en
- Charset
- utf-8
- Viewport
- width=device-width, initial-scale=1.0
- Robots meta
- Manifest
Technologies
Detected frameworks, languages, and tools.
Hosting & CDN
- Hosting provider
- —
- CDN provider
- Cloudflare
- IP address
- —
- ASN
- —
DNS records
| Type | Value |
|---|---|
| A | — |
| AAAA | — |
| MX | — |
| TXT | — |
| NS | — |
| CAA | — |
| CNAME | — |
| IPv6 support | No |
TLS / SSL certificate
- Version
- TLS 1.3
- Issuer
- Google Trust Services
- Subject
- clingendael.org
- Valid from
- Jun 22, 2026
- Valid to
- Sep 20, 2026
- Days until expiry
- 53
- SAN domains
- clingendael.org, *.clingendael.org
Security headers
- Strict-Transport-SecurityEnabled
- Content-Security-PolicyEnabled
- X-Frame-OptionsEnabled
- X-Content-Type-OptionsEnabled
- Referrer-PolicyEnabled
- Permissions-PolicyMissing
Compression: gzip · 0 cookie(s) observed
Content & assets
Headings
H1 0 · H2 4 · H3 23
Links
79 internal · 6 external · 20 broken
Images
24 total · 0 missing alt
Scripts / Styles
15 scripts · 2 stylesheets
JS / CSS size
6.0 KB · 0 B
Page size
64.0 KB
Robots.txt & Sitemap
- robots.txt
- Not found
- Disallow rules
- 0
- sitemap.xml
- Not found
- URLs in sitemap
- 0
SEO issues
- Missing meta description
- No H1 heading found
- No structured data (JSON-LD) found
- Missing OpenGraph tags
- robots.txt not found
- sitemap.xml not found
Accessibility issues
- No H1 heading found
Scan details
- Requested URL
- https://clingendael.org
- Final URL
- https://www.clingendael.org/
- HTTP status
- 200
- HTTP version
- HTTP/2
- Response time
- 1.70 s
- HTML size
- 64.0 KB
- Redirect chain
- https://clingendael.org → https://www.clingendael.org/
See something wrong on this report? Request a correction
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Frequently asked questions
- What technology does clingendael.org use?
- clingendael.org is built with Drupal, Cloudflare Analytics.
- Is clingendael.org secure (HTTPS)?
- Yes. clingendael.org uses TLS 1.3 with a certificate issued by Google Trust Services, valid until Sep 20, 2026.
- Who hosts clingendael.org?
- Hosting provider information for clingendael.org is not available yet.
- What is clingendael.org's SEO score?
- clingendael.org scored 55/100 for SEO in the latest analysis (fair).
- What is clingendael.org's overall website score?
- clingendael.org has an overall SiteGraph score of 82/100, combining SEO, performance, security, and accessibility.
OpenGraph & Twitter Card
OpenGraph
Twitter Card