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c3d2.de

<<</>> Chaos Computer Club Dresden | C3D2 News

Last scanned Aug 24, 2026, 1:23 PM

89

Overall score

Great

Summary

<<</>> C3D2, der Erfahrungsaustauschkreis aus Dresden. This website uses jQuery hosted on fluepke-net - Carl Fabian Luepke, DE. SEO is good (75/100) and accessibility is excellent (95/100). Security scores excellent (90/100) and performance excellent (100/100). Top issue: Missing canonical link.

<<</>> C3D2, der Erfahrungsaustauschkreis aus Dresden

Germany
Hosted on fluepke-net - Carl Fabian Luepke, DE

Top issues to fix

6 issues found · 2 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 viewport meta tag

    Accessibility

    Add <meta name="viewport" content="width=device-width, initial-scale=1"> — without it the site is broken on mobile.

  • 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.

75

SEO

4 issue(s) found

100

Performance

154 ms

90

Security

HTTPS & header checks

95

Accessibility

1 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.

<<</>> C3D2, der Erfahrungsaustauschkreis aus Dresden

Contact

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

Meta tags

Title
<<</>> Chaos Computer Club Dresden | C3D2 News
Description
<<</>> C3D2, der Erfahrungsaustauschkreis aus Dresden
Canonical
Language
de
Charset
utf-8
Viewport
Robots meta
index,follow
Manifest

OpenGraph & Twitter Card

OpenGraph

og:title
—
og:description
—
og:type
—
og:url
—

Twitter Card

twitter:card
—
twitter:title
—
twitter:description
—

Technologies

Detected frameworks, languages, and tools.

jQuery

Hosting & CDN

CDN provider
—
IP address
45.158.40.167
ASN
AS208135 (fluepke-net - Carl Fabian Luepke, DE)

DNS records

TypeValue
A
  • 45.158.40.167
AAAA
  • 2a0f:5382:acab:1400::a7
MX
  • mail.flpk.zentralwerk.org
TXT
  • v=spf1 mx -all
  • google-site-verification=xGviXV4_vVwsGK2L47JWy6T7hn3OndKflzepyAYgS-Q
NS
  • ns1.supersandro.de
  • ns2.zentralwerk.org
  • ns.spaceboyz.net
  • ns.c3d2.de
CAA
  • 128 issuewild "letsencrypt.org"
  • 128 issue "letsencrypt.org"
  • 128 iodef "mailto:mail@c3d2.de"
CNAME—
IPv6 supportYes

TLS / SSL certificate

Version
TLS 1.3
Issuer
Let's Encrypt
Subject
c3d2.de
Valid from
Jul 20, 2026
Valid to
Oct 18, 2026
Days until expiry
54
SAN domains
c3d2.de

Security headers

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

Compression: gzip · 0 cookie(s) observed

Content & assets

Headings

H1 1 · H2 1 · H3 12

Links

36 internal · 33 external · 0 broken

Images

6 total · 0 missing alt

Scripts / Styles

3 scripts · 1 stylesheets

JS / CSS size

103 KB · 17.6 KB

Page size

29.9 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

Accessibility issues

  • Missing viewport meta tag

Scan details

Requested URL
https://c3d2.de
Final URL
https://c3d2.de
HTTP status
200
HTTP version
HTTP/2
Response time
154 ms
HTML size
29.9 KB
Redirect chain
https://c3d2.de

See something wrong on this report? Request a correction

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Frequently asked questions

What technology does c3d2.de use?
c3d2.de is built with jQuery.
Is c3d2.de secure (HTTPS)?
Yes. c3d2.de uses TLS 1.3 with a certificate issued by Let's Encrypt, valid until Oct 18, 2026.
Who hosts c3d2.de?
c3d2.de is hosted on fluepke-net - Carl Fabian Luepke, DE.
What is c3d2.de's SEO score?
c3d2.de scored 75/100 for SEO in the latest analysis (fair).
What is c3d2.de's overall website score?
c3d2.de has an overall SiteGraph score of 89/100, combining SEO, performance, security, and accessibility.