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czsk.net

https://czsk.net· First analyzed 02 Jun 2026· Updated 02 Jun 2026
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czsk.net
Desktop screenshot of czsk.net
Mobile screenshot of czsk.net
Mobile

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Hosting Provider

Web4U s.r.o

IP Address

81.91.86.10

Site Location

🇨🇿 Czech Republicvia ip

Server Location

🇨🇿 Prague, Czechia

ASN

AS39790

Organization

Web4U s.r.o

Server

OpenResty

Nameservers

ns2.web4u.cz.ns.web4u.cz.

Performance

100

Core Web Vitals

Weight

First Contentful Paint
329 ms10%
Speed Index
428 ms10%
Largest Contentful Paint
—25%
Total Blocking Time
0.0 ms30%
Cumulative Layout Shift
0.00025%
247 KB
13 requests
0–49
50–89
90–100

Architecture Stack

Monolithic
⚙️ SSR
Infrastructure
Hosting
Web4U s.r.o

Technology Stack

1 Technologies Detected

Web Servers

1
OpenResty

SEO Analysis

F36/100
9
10
4
Meta Tags4/15
Content10/12
Headings0/8
Technical4/21
E-E-A-T0/7
Images1/7
Links5/5
URL5/5
Social0/5
Freshness0/4
Mobile4/4
Indexability3/3
C
czsk.netczsk.net

Slovensko-český klub

No description available for this page.

Title Length20 chars

Recommended: 50-60 chars (~119px / 580px)

Description Length0 chars

Recommended: 120-160 chars

Issues (4)

  • • Missing meta description — important for click-through rates in SERPs
  • • Missing H1 tag — every page should have exactly one H1
  • • Most images missing alt text (7/10) — critical for accessibility and SEO

14 issues found

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Local SEO

Local Search Readiness

0/100
Poor
15 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

F34/100
Bot Access
20/25
Machine Read.
10/25
Schema Data
0/25
Citation
4/25

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:48%
Words:439
Token eff.:Optimal

Structured Data

No Schema

Citation Readiness

Opening Summary43w
Descriptive Headings
Canonical URL
Open Graph0/3
Twitter Card0/3
Language Tag
Publish Date
Author Info
Lists
Tables
TL;DR / Summary
About Page Link
Recommendations (11)
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.
D
58/100
6
Passed
5
Critical
1
Warnings
Images & Alt Text
20/20
Checks if images have descriptive alt text for screen readers and visually impaired users.
Semantic Structure
3/20
Evaluates proper use of HTML5 semantic elements (header, nav, main, footer) and heading hierarchy.
Forms & Inputs
10/15
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.
4 recommendations
  • •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.
54/100
A+
31 mg
CO₂e / view
246.9 KB
Page Weight
95%
Cleaner Than
New Visitor
35 mg
vs
Returning (cached)
18 mg
Annual (10K/mo)
3.7 kg
Emission Segments
Data Center
7 mg
Network
7 mg
Device
16 mg
Resource Breakdown
Images
242.9 KB
CSS
715 B
HTML
3.4 KB
Green Hosting Not Verified
Web4U s.r.o
4 recommendations
  • •Carbon footprint recommendation preview...
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F

Security Score

21%Critical
Interactive

HTTPS

No WAF

89d

Certificate Details

Type

Domain Validated (DV)

Certificate Authority

Let's Encrypt

Key Algorithm

RSA (2048 bit)

Signature

SHA-256 with RSA

TLS Version

TLSv1.3

HTTP Protocol

HTTP/2

Valid From

01.06.2026

Valid Until

30.08.2026

Subject Alternative Names (2)

czsk.netwww.czsk.net

SHA-256 Fingerprint

8B:0F:09:28:AF:28:27:24:CE:4C:5B:03:A9:4A:CC:47:B9:73:0D:4F...

Top Recommendations

Security recommendation preview

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HTTP Headers

Developer Console

content-encoding
📦 Gzip(gzip)
content-type
text/html
date
Tue, 02 Jun 2026 20:46:55 GMT
server
openresty
x-w4u-upstream
http://data27_php4
Good Warning Issue

Email Infrastructure

Custom Mail Server

Score

20

SPF
DKIM
DMARC

MX Records (2)

mx2.mailchannels.net
mx1.mailchannels.net

Domain Information

czsk.net

Domain Age
24y 8m

Created

21.09.2001

Expires

21.09.2026

Last Updated

07.08.2025

Registrar

COREhub, S.R.L.

DNSSEC
Not Enabled

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
27/100
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.
5 recommendations
  • •Mobile compatibility recommendation preview...
Upgrade to view recommendations

Typography & Readability

Times New Roman

WCAG Partial
60/100
Readability
/30
22/30

16px · LH --

Hierarchy
/20
7/20
WCAG
/25
17/25

2.09:1 min contrast

Performance
/25
14/25

1 font

Heading Font

Times New Roman

Body Font

Times New Roman

Serif16px

Contrast Ratio

2.09:1

28 issues

Reading Comfort

~70 CPL

Optimal (45–75)
16px
p

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

✅ Optimal line length: ~70 chars/line (ideal 45–75 CPL).

❌ Very complex text: Flesch score 13/100. Consider shorter sentences and simpler words.

⚠️ Partial contrast: 28 elements below WCAG AA threshold (min 2.1:1).

⚠️ Text justify detected: Justified text creates uneven word spacing, hurting readability on web.

✅ Lean font stack: 1 font families keeps load times fast.

Buy on MyFontsFlesch 13

Color Palette

8 unique colors
Light
#ffffff
Background· 71.60000000000001%
#8c000b
Primary· 9.5%
#00ccff
Accent· 8.5%
#f3e9e9
Secondary· 3.3%
#99afbf
Secondary· 3%
#7e3740
Secondary· 2.6%
#2cd3f9
Accent· 1.2%
#ac0115
Accent· 0.5%

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Scripts & Styles

1 Resources

0
Scripts
1
Styles
0
Async
0
Defer

Top Script Sources

Website Identity

czsk.net

24 years old
Location detected: 🇨🇿 Czech Republicvia ip
COREhub, S.R.L.

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Last analyzed: 02 Jun 2026 at 20:47

Historical Analysis & Change Tracking

czsk.net Technology Stack - Built With OpenResty | StackOptic | StackOptic