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cdr.cz

https://cdr.cz· First analyzed 13 May 2026· Updated 13 May 2026
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cdr.cz
Desktop screenshot of cdr.cz
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Mobile

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Hosting Provider

Aira Group

IP Address

178.238.38.24

Site Location

🇨🇿 Czech Republicvia tld

Server Location

🇨🇿 Prague, Czechia

ASN

AS24971

Organization

Aira Group

Server

Nginx

Nameservers

nsc.aira.cz.nsb.aira.cz.nsa.aira.cz.

Performance

100

Core Web Vitals

Weight

First Contentful Paint
681 ms10%
Speed Index
885 ms10%
Largest Contentful Paint
—25%
Total Blocking Time
0.0 ms30%
Cumulative Layout Shift
0.00025%
1.6 MB
211 requests
0–49
50–89
90–100

Architecture Stack

Monolithic
⚙️ SSR
Drupal

Technology Stack

11 Technologies Detected

Analytics

4
Google Analytics
Google Analytics 4
Facebook PixelMicrosoft Clarity

CSS Frameworks

2
Tailwind CSS
Foundation

Libraries

1
jQueryv1.10

UI Components

1
Fancybox

Tag Managers

1
Google Tag Manager

Advertising

1
Google Ads

Web Servers

1
Nginx

SEO Analysis

C64/100
18
8
2
Meta Tags4/15
Content10/12
Headings8/8
Technical18/25
E-E-A-T7/7
Images1/7
Links5/5
URL5/5
Social0/5
Freshness0/4
Mobile3/4
Indexability3/3
C
cdr.czcdr.cz

cdr.cz | Vybráno z IT

No description available for this page.

Title Length21 chars

Recommended: 50-60 chars (~123px / 580px)

Description Length0 chars

Recommended: 120-160 chars

Issues (2)

  • • Missing meta description — important for click-through rates in SERPs
  • • Most images missing alt text (105/117) — critical for accessibility and SEO

10 issues found

Upgrade to view details

Crawlability

Sitemap

Type: standard

18,227 URLs

robots.txt

70 rules

Local SEO

Local Search Readiness

4/100
Poor
1 15 1

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

D43/100
Bot Access
20/25
Machine Read.
1/25
Schema Data
9/25
Citation
13/25

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
Text ratio:8%
Words:3,560
Token eff.:Poor Structure

Structured Data

20 JSON-LD
Article×1.2Person×1.3Organization×1.1

Citation Readiness

Opening Summary178w
Descriptive Headingsavg 9.7w
Canonical URL
Open Graph0/3
Twitter Card0/3
Language Tag
Publish Date
Author Info
Lists
Tables
TL;DR / Summary
About Page Link
Recommendations (12)
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.
C
63/100
10
Passed
5
Critical
2
Warnings
Images & Alt Text
15/20
Checks if images have descriptive alt text for screen readers and visually impaired users.
Semantic Structure
10/20
Evaluates proper use of HTML5 semantic elements (header, nav, main, footer) and heading hierarchy.
Forms & Inputs
5/15
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
11/15
Ensures all interactive elements are reachable and operable via keyboard (tab, enter, escape).
ARIA & Roles
7/15
Checks correct use of WAI-ARIA attributes (roles, states, properties) for assistive technologies.
5 recommendations
  • •Accessibility recommendation preview...
Upgrade to view recommendations

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.
31/100
C
202 mg
CO₂e / view
1.6 MB
Page Weight
60%
Cleaner Than
New Visitor
231 mg
vs
Returning (cached)
116 mg
Annual (10K/mo)
24.3 kg
Emission Segments
Data Center
45 mg
Network
49 mg
Device
108 mg
Resource Breakdown
JavaScript
401.4 KB
Images
1000.9 KB
CSS
201.7 KB
HTML
29.7 KB
Other
300 B
Green Hosting Not Verified
Aira Group
6 recommendations
  • •Carbon footprint recommendation preview...
Upgrade to view recommendations
D

Security Score

56%Poor
Interactive

HTTPS

No WAF

48d

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

02.04.2026

Valid Until

01.07.2026

Subject Alternative Names (12)

cdr.czcdrserver.czdeepinit.czdiit.czitnews.cztopit.czwww.cdr.czwww.cdrserver.cz+4 more

SHA-256 Fingerprint

17:83:C7:B2:4F:3C:D0:A9:F1:3D:79:26:71:FD:20:9C:A1:0F:63:2B...

Top Recommendations

Security recommendation preview

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HTTP Headers

Developer Console

access-control-allow-origin
*
cache-control
🔴 No Cache(no-cache, must-revalidate)
content-encoding
📦 Gzip(gzip)
content-language
cs
content-length
30102
content-type
text/html; charset=utf-8
Good Warning Issue

Email Infrastructure

Custom Mail Server

Score

73

SPF
DKIM
DMARC

DMARC Policy

Quarantine (Moderate)

MX Records (1)

pmg.aira.cz

Domain Information

cdr.cz

Domain Age
27y 6m

Created

06.11.1998

Expires

19.10.2026

Last Updated

25.09.2014

Registrar

REG-WEBGLOBE

DNSSEC
Not Enabled

Privacy & Compliance

Quantcast Choice

Cookie Consent Banner
Quantcast Choice
Privacy Policy
Terms of Service

GDPR Indicators

Cookie consent banner detected
CMP: Quantcast Choice
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.
C
65/100
Mobile Friendly1 breakpoint
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.
Viewport
width=device-width, initial-scale=1.0
3 recommendations
  • •Mobile compatibility recommendation preview...
Upgrade to view recommendations

Typography & Readability

Helvetica Neue + Arial

WCAG Partial
55/100
Readability
/30
18/30

13px · LH 1.50

Hierarchy
/20
10/20

2.71x ratio

WCAG
/25
12/25

1.01:1 min contrast

Performance
/25
15/25

System fonts

Heading Font

Helvetica Neue

Sans35px

Body Font

Arial

Sans13px

Contrast Ratio

1.01:1

15 issues

Reading Comfort

~46 CPL

Optimal (45–75)
35px
h1
37px
h2
13px
p
Minor Second
Scale

❌ Critical: 13px body text is too small. Minimum 14px, recommend 16px+.

✅ Optimal line spacing: 1.50 ratio (ideal range 1.4–1.6).

✅ Optimal line length: ~46 chars/line (ideal 45–75 CPL).

⚠️ Partial contrast: 15 elements below WCAG AA threshold (min 1.0:1).

❌ Missing H1: Every page should have exactly one H1 element for SEO and accessibility.

✅ Strong hierarchy: Headlines are 2.7x larger than body text.

Fluid Type

Color Palette

4 unique colors
Light
#ededed
Background· 47.30000000000001%
#679bb8
Primary· 9.8%
#dadfe1
Border· 5.9%

Business & Marketing Stack

5 Tools Detected

Enterprise

Behavior Analytics

3
Google Tag ManagerFree
Google AnalyticsFree
Microsoft ClarityFree

User behavior and product analytics

Advertising

1
Facebook PixelMid-Market

Ad platforms and retargeting pixels

Social Media

1
Facebook SDKFree

Social widgets and sharing tools

3

Categories

5

Total Tools

0

Enterprise

1

Mid-Market

Assessment: Sophisticated marketing and sales technology infrastructure

Ad Networks

Google Ad Manager

Sponsored

Scripts & Styles

22 Resources

20
Scripts
2
Styles
9
Async
1
Defer

Top Script Sources

local(10)googletagmanager.com(5)connect.facebook.net(2)scripts.clarity.ms(1)clarity.ms(1)

Website Identity

Astronomové našli stopu k monstrózním černým dírám. Vznikají jinak, než čekali

Mezinárodní tým astronomů vedený Cardiffskou univerzitou přišel s novým vysvětlením vzniku největších černých děr ve vesmíru. Podle studie zveřejněné 7. května 2026 v Nature Astronomy mohou vznikat opakovanými srážkami v extrémně hustých hvězdokupách.

27 years old
Location detected: 🇨🇿 Czech Republicvia tld
REG-WEBGLOBE

Social Profiles

FacebookX (Twitter)

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Last analyzed: 13 May 2026 at 15:56

Historical Analysis & Change Tracking