What technology does dfn-cert.de use?

dfn-cert.de is built with Apache.

Is dfn-cert.de secure (HTTPS)?

Yes. dfn-cert.de uses TLS 1.3 with a certificate issued by Hellenic Academic and Research Institutions CA, valid until Dec 15, 2026.

Who hosts dfn-cert.de?

Hosting provider information for dfn-cert.de is not available yet.

What is dfn-cert.de's SEO score?

dfn-cert.de scored 75/100 for SEO in the latest analysis (fair).

What is dfn-cert.de's overall website score?

dfn-cert.de has an overall SiteGraph score of 88/100, combining SEO, performance, security, and accessibility.

dfn-cert.de

DFN-CERT Services GmbH

Last scanned Aug 24, 2026, 1:23 PM

Overall score

Great

Summary

Forschung, Beratung und Dienstleistung für mehr Sicherheit im Internet. This website uses Apache. SEO is good (75/100) and accessibility is excellent (100/100). Security scores excellent (90/100) and performance excellent (90/100). Top issue: Missing canonical link.

Forschung, Beratung und Dienstleistung für mehr Sicherheit im Internet

Top issues to fix

6 issues found · 1 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 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.
robots.txt not found
SEO
Publish /robots.txt with a Sitemap: directive to guide crawlers.
sitemap.xml not found
SEO
Publish an XML sitemap and reference it from robots.txt to speed up page discovery.
1 broken link on the page
SEO
Fix or remove broken links — they waste crawl budget and erode user trust.

SEO

4 issue(s) found

Performance

516 ms

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.

Forschung, Beratung und Dienstleistung für mehr Sicherheit im Internet

Meta tags

Title: DFN-CERT Services GmbH
Description: Forschung, Beratung und Dienstleistung für mehr Sicherheit im Internet
Canonical
Language: de
Charset: utf-8
Viewport: width=device-width, initial-scale=1.0
Robots meta
Manifest: https://www.dfn-cert.de/static/images/favicon/site.webmanifest

Technologies

Detected frameworks, languages, and tools.

Apache

Hosting & CDN

Hosting provider: —
CDN provider: —
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: Hellenic Academic and Research Institutions CA
Subject: dfn-cert.de
Valid from: Dec 15, 2025
Valid to: Dec 15, 2026
Days until expiry: 111
SAN domains: dfn-cert.de, www.dfn-cert.de

Security headers

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

Compression: none · 0 cookie(s) observed

Content & assets

Headings

H1 1 · H2 6 · H3 0

Links

26 internal · 7 external · 1 broken

Images

5 total · 0 missing alt

Scripts / Styles

2 scripts · 1 stylesheets

JS / CSS size

81.3 KB · 449 KB

Page size

31.5 KB

Robots.txt & Sitemap

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

SEO issues

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

Scan details

Requested URL: https://dfn-cert.de
Final URL: https://www.dfn-cert.de/
HTTP status: 200
HTTP version: HTTP/1.1
Response time: 516 ms
HTML size: 31.5 KB
Redirect chain: https://dfn-cert.de → https://www.dfn-cert.de/

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Frequently asked questions

What technology does dfn-cert.de use?: dfn-cert.de is built with Apache.
Is dfn-cert.de secure (HTTPS)?: Yes. dfn-cert.de uses TLS 1.3 with a certificate issued by Hellenic Academic and Research Institutions CA, valid until Dec 15, 2026.
Who hosts dfn-cert.de?: Hosting provider information for dfn-cert.de is not available yet.
What is dfn-cert.de's SEO score?: dfn-cert.de scored 75/100 for SEO in the latest analysis (fair).
What is dfn-cert.de's overall website score?: dfn-cert.de has an overall SiteGraph score of 88/100, combining SEO, performance, security, and accessibility.