What technology does cwi.nl use?

cwi.nl is built with Django, Nginx.

Is cwi.nl secure (HTTPS)?

Yes. cwi.nl uses TLS 1.3 with a certificate issued by Hellenic Academic and Research Institutions CA, valid until Dec 7, 2026.

cwi.nl is hosted on CWI-NL - CWI-NL, NL.

What is cwi.nl's SEO score?

cwi.nl scored 70/100 for SEO in the latest analysis (fair).

What is cwi.nl's overall website score?

cwi.nl has an overall SiteGraph score of 84/100, combining SEO, performance, security, and accessibility.

cwi.nl

Home

Last scanned Jul 21, 2026, 11:40 AM

Overall score

Great

Top issues to fix

8 issues found · 3 high priority

Missing Content-Security-Policy header
Security
Add a CSP to control which sources can run scripts — the strongest single defense against XSS.
Missing meta description
SEO
Add a ~150-character meta description to control your search-result snippet and lift click-through rate.
Slow estimated load (7.3s)
Performance
Use a CDN, enable caching/compression, and cut render-blocking assets — every extra second costs conversions.
1 cookie without Secure/HttpOnly flags
Security
Set Secure and HttpOnly on session cookies so they can't leak over HTTP or be read by injected scripts.
Missing canonical link
SEO
Add <link rel="canonical"> so search engines know which URL variant to index.
No structured data (JSON-LD) found
SEO
Add JSON-LD (Organization, Article, Product…) to become eligible for rich results.

+2 more issues — details in the sections below.

Summary

This website uses Nginx hosted on CWI-NL - CWI-NL, NL. SEO is fair (70/100) and accessibility is excellent (100/100). Security scores excellent (90/100) and performance good (80/100). Top issue: Missing meta description.

SEO

4 issue(s) found

Performance

7.33 s

Security

HTTPS & header checks

100

Accessibility

0 issue(s) found

Not enough scan history yet to show a trend — check back after this site has been re-scanned a few more times.

Organization

Company details published in this site's own structured data.

LinkedIn Instagram YouTube YouTube

Contact

Email, phone, and address published on this site's own pages.

Email: info@cwi.nl
Phone: +31205929333

Technologies

Detected frameworks, languages, and tools.

Django Nginx

Hosting & CDN

Hosting provider: CWI-NL - CWI-NL, NL
CDN provider: —
IP address: 192.16.191.61
ASN: AS1888 (CWI-NL - CWI-NL, NL)

DNS records

Type	Value
A	192.16.191.61
AAAA	2001:610:128:c112:192:16:197:256
MX	—
TXT	—
NS	—
CAA	—
CNAME	website-prd.cwi.nl
IPv6 support	Yes

TLS / SSL certificate

Version: TLS 1.3
Issuer: Hellenic Academic and Research Institutions CA
Subject: cwi.nl
Valid from: May 22, 2026
Valid to: Dec 7, 2026
Days until expiry: 138
SAN domains: cwi.nl, www.cwi.nl

Security headers

Strict-Transport-SecurityEnabled
Content-Security-PolicyMissing
X-Frame-OptionsEnabled
X-Content-Type-OptionsEnabled
Referrer-PolicyEnabled
Permissions-PolicyMissing

Compression: none · 1 cookie(s) observed

Content & assets

Headings

H1 1 · H2 18 · H3 1

Links

43 internal · 16 external · 2 broken

Images

8 total · 0 missing alt

Scripts / Styles

4 scripts · 1 stylesheets

JS / CSS size

141 KB · 238 KB

Page size

79.9 KB

Robots.txt & Sitemap

robots.txt: Found
Disallow rules: 1
sitemap.xml: Not found
URLs in sitemap: 0

SEO issues

Missing meta description
Missing canonical link
No structured data (JSON-LD) found
sitemap.xml not found

Scan details

Requested URL: https://cwi.nl
Final URL: https://www.cwi.nl/en/
HTTP status: 200
HTTP version: HTTP/1.1
Response time: 7.33 s
HTML size: 79.9 KB
Redirect chain: https://cwi.nl → https://www.cwi.nl/ → https://www.cwi.nl/en/

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Frequently asked questions

What technology does cwi.nl use?: cwi.nl is built with Django, Nginx.
Is cwi.nl secure (HTTPS)?: Yes. cwi.nl uses TLS 1.3 with a certificate issued by Hellenic Academic and Research Institutions CA, valid until Dec 7, 2026.
Who hosts cwi.nl?: cwi.nl is hosted on CWI-NL - CWI-NL, NL.
What is cwi.nl's SEO score?: cwi.nl scored 70/100 for SEO in the latest analysis (fair).
What is cwi.nl's overall website score?: cwi.nl has an overall SiteGraph score of 84/100, combining SEO, performance, security, and accessibility.