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c3d2.de

https://c3d2.de· First analyzed 12 May 2026· Updated 12 May 2026
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c3d2.de
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Mobile

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Hosting Provider

C3d2

IP Address

45.158.40.167

Site Location

🇩🇪 Germanyvia tld

Server Location

🇩🇪 Frankfurt am Main, Germany

ASN

AS208135

Organization

C3d2

Server

Internal Server Error

Nameservers

ns1.supersandro.de.ns2.zentralwerk.org.ns.c3d2.de.ns.spaceboyz.net.

Performance

100

Core Web Vitals

Weight

First Contentful Paint
371 ms10%
Speed Index
482 ms10%
Largest Contentful Paint
—25%
Total Blocking Time
0.0 ms30%
Cumulative Layout Shift
0.00025%
671 KB
14 requests

Image Optimization

Lazy Load
0–49
50–89
90–100

Architecture Stack

Monolithic
⚙️ SSR
Infrastructure
Hosting
C3d2

Technology Stack

1 Technologies Detected

Libraries

1
jQueryv1.8.3

SEO Analysis

B71/100
20
7
1
Meta Tags10/15
Content12/12
Headings8/8
Technical13/21
E-E-A-T3/7
Images5/7
Links5/5
URL5/5
Social1/5
Freshness2/4
Mobile4/4
Indexability3/3
C
c3d2.dec3d2.de

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

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

Title Length46 chars

Recommended: 50-60 chars (~286px / 580px)

Description Length53 chars

Recommended: 120-160 chars

Issues (1)

  • • Missing viewport meta tag — page may not be mobile-friendly (Google uses mobile-first indexing)

8 issues found

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Local SEO

Local Search Readiness

8/100
Poor
2 13 2

This site doesn't appear to be a local business. Local SEO signals are optional for non-local websites.

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AI & LLM Readiness

D54/100
Bot Access
20/25
Machine Read.
17/25
Schema Data
3/25
Citation
14/25

AI Bot Access

14/14 accessible
AI Search
OAI-SearchBot
PerplexityBot
Claude-SearchBot
Gemini-Deep-Research
DuckAssistBot
Training
GPTBot
ClaudeBot
Google-Extended
Meta-ExternalAgent
Bytespiderinfo
Amazonbot
Applebot-Extended
CCBotinfo
Fetch
ChatGPT-User

Machine Readability

llms.txt
llms-full.txt
Semantic HTML
Heading Hierarchy
def. listsnavheader/footer
Text ratio:26%
Words:938
Token eff.:Optimal
Sections/1K:11.7
Depth:3/5

Structured Data

Microdata
NewsArticle×1.2microdataEventmicrodata

Citation Readiness

Opening Summary34w
Descriptive Headingsavg 3.5w
Canonical URL
Open Graph1/3
Twitter Card0/3
Language Tag
Publish Date
Author Info
Lists
Tables
TL;DR / Summary
About Page Link
Recommendations (7)
AI readiness recommendation preview...
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Accessibility

WCAG 2.1 Compliance

Evaluates how accessible your website is for users with disabilities, based on WCAG 2.1 guidelines. Checks images, forms, keyboard navigation, ARIA roles, and color contrast.
A
80/100
11
Passed
2
Critical
0
Warnings
Images & Alt Text
20/20
Checks if images have descriptive alt text for screen readers and visually impaired users.
Semantic Structure
20/20
Evaluates proper use of HTML5 semantic elements (header, nav, main, footer) and heading hierarchy.
Forms & Inputs
15/15
Verifies form fields have labels, error messages are clear, and inputs are properly associated.
Color & Contrast
15/15
Tests text-to-background color contrast ratios against WCAG AA/AAA minimum requirements.
Keyboard & Focus
9/15
Ensures all interactive elements are reachable and operable via keyboard (tab, enter, escape).
ARIA & Roles
1/15
Checks correct use of WAI-ARIA attributes (roles, states, properties) for assistive technologies.
1 recommendation
  • •Accessibility recommendation preview...
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Carbon Footprint

SWDM v4 · Eco-Score

Carbon emissions estimated using the Sustainable Web Design Model v4 (SWDM v4). Factors in data center, network, and device energy across new and returning visitors. Grade thresholds based on HTTP Archive percentiles.
56/100
B
83 mg
CO₂e / view
670.9 KB
Page Weight
80%
Cleaner Than
New Visitor
95 mg
vs
Returning (cached)
47 mg
Annual (10K/mo)
10.0 kg
Emission Segments
Data Center
19 mg
Network
20 mg
Device
45 mg
Resource Breakdown
JavaScript
36.1 KB
Images
571.7 KB
CSS
57.5 KB
HTML
5.7 KB
Green Hosting Not Verified
C3d2
4 recommendations
  • •Carbon footprint recommendation preview...
Upgrade to view recommendations
A+

Security Score

93%Excellent
Static / Informational

HTTPS

No WAF

40d

Certificate Details

Type

Domain Validated (DV)

Certificate Authority

Let's Encrypt

Key Algorithm

ECDSA (secp256r1) (256 bit)

Signature

ECDSA with SHA-384

TLS Version

TLSv1.3

HTTP Protocol

HTTP/2

Valid From

23.03.2026

Valid Until

21.06.2026

Subject Alternative Names (1)

c3d2.de

SHA-256 Fingerprint

DD:59:19:FE:2B:33:7A:74:15:C7:20:10:77:13:D0:FE:8A:37:84:B0...

Recommendations

Security recommendation preview

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HTTP Headers

Developer Console

content-encoding
⚡ Brotli(br)
content-type
text/html
date
Tue, 12 May 2026 03:16:06 GMT
etag
W/"6a025e20-5f5d"
last-modified
Mon, 11 May 2026 22:54:24 GMT
onion-location
http://c3d2deccoolwjnqsuy6e2f5f7d75nxnib5o6o75pekzc23zjteojk...
Good Warning Issue

Email Infrastructure

Custom Mail Server

Score

98

SPF
DKIM
DMARC

DMARC Policy

Quarantine (Moderate)

MX Records (1)

mail.flpk.zentralwerk.org

Domain Information

c3d2.de

Last Updated

28.01.2026

DNSSEC
Not Enabled

Privacy & Compliance

Cookie Consent Banner
Privacy Policy
Terms of Service

GDPR Indicators

Privacy policy page linked
Data Protection Officer mentioned

Mobile Compatibility

Viewport & Responsive Test

Tests how well your website works on mobile devices. Checks viewport configuration, responsive layout, touch targets, font readability, and simulates rendering across different screen sizes.
F
34/100
Not Mobile Friendly
Viewport Meta
The viewport meta tag tells mobile browsers how to scale the page. Without it, mobile devices render at desktop width.
Responsive Design
Uses CSS media queries or flexible layouts to adapt content to different screen sizes automatically.
Touch Icons
Apple touch icons and favicons displayed when users add the site to their home screen on mobile devices.
Readable Font Size
Base font size should be at least 16px on mobile to ensure text is readable without zooming.
Relative Units
Using em, rem, %, or vw instead of fixed px values allows content to scale properly across screen sizes.
No H-Scroll Risk
No elements wider than the viewport that would cause horizontal scrolling on mobile devices.
Tap Targets OK
Interactive elements (buttons, links) are at least 48x48px with enough spacing to prevent accidental taps.
No Fixed Widths
No elements with fixed pixel widths that could overflow on smaller screens and break the layout.
3 recommendations
  • •Mobile compatibility recommendation preview...
Upgrade to view recommendations

Typography & Readability

Verdana

WCAG Partial
73/100
Readability
/30
26/30

16px · LH 1.30

Hierarchy
/20
19/20

2x ratio · ✓ H1→H6

WCAG
/25
14/25

1:1 min contrast

Performance
/25
14/25

1 font

Heading Font

Verdana

Sans32px

Body Font

Verdana

Sans16px

Contrast Ratio

1:1

17 issues

Reading Comfort

~48 CPL

Optimal (45–75)
32px
h1
32px
h2
21px
h3
16px
p

✅ Excellent readability: 16px body text is ideal for all devices.

⚠️ Tight line spacing (1.30). Increase to 1.4–1.6 for better readability.

✅ Optimal line length: ~48 chars/line (ideal 45–75 CPL).

⚠️ Hard to read: Flesch score 33/100. Simplify sentences for wider reach.

⚠️ Partial contrast: 17 elements below WCAG AA threshold (min 1.0:1).

✅ Perfect heading hierarchy: Sequential h1→h2→h3 with single H1 — ideal for SEO & accessibility.

Buy on MyFontsFlesch 33

Color Palette

10 unique colors
3.34:1 AA Large Light
#ffffff
Background· 63.1%
#8d8c90
Other· 2.3%
#00050c
Accent· 8.3%
#011530
Accent· 6.8999999999999995%
#4f6d91
Secondary· 5.5%
#172537
Secondary· 3.2%
#383f5c
Secondary· 2.5%
#e8e5ce
Primary· 2.1%

Business & Marketing Stack

1 Tools Detected

Growing

Behavior Analytics

1
Google AnalyticsFree

User behavior and product analytics

1

Categories

1

Total Tools

0

Enterprise

0

Mid-Market

Assessment: Growing marketing technology adoption

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Scripts & Styles

4 Resources

3
Scripts
1
Styles
0
Async
3
Defer

Top Script Sources

script(3)

Website Identity

c3d2.de

Location detected: 🇩🇪 Germanyvia tld
de

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Last analyzed: 12 May 2026 at 03:16

Historical Analysis & Change Tracking