sdn.cz

https://sdn.cz· First analyzed 05 May 2026· Updated 05 May 2026

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sdn.cz

Mobile

Sponsored

Hosting Provider

Seznam - II

IP Address

77.75.79.195

Site Location

🇨🇿 Czech Republicvia tld

Server Location

🇨🇿 Prague, Czechia

ASN

AS43037

Server

Nginx

CDN

Varnish

Nameservers

ams.seznam.cz.ans.seznam.cz.

Performance

100

Core Web Vitals

Weight

First Contentful Paint

241 ms10%

Speed Index

313 ms10%

Largest Contentful Paint

—25%

Total Blocking Time

0.0 ms30%

Cumulative Layout Shift

0.00025%

1 requests

0–49

50–89

90–100

Architecture Stack

Monolithic

⚙️ SSR

Infrastructure

Hosting

Seznam - II

CDN

Varnish

Technology Stack

1 Technologies Detected

Web Servers

Nginx

SEO Analysis

F18/100

Meta Tags0/15

Content0/12

Headings0/8

Technical6/25

E-E-A-T0/7

Images0/7

Links0/5

URL5/5

Social0/5

Freshness0/4

Mobile4/4

Indexability3/3

sdn.czsdn.cz

No Title Found

No description available for this page.

Title Length0 chars

Recommended: 50-60 chars

Description Length0 chars

Recommended: 120-160 chars

Issues (5)

• Missing page title — critical for SEO rankings and SERP display
• Missing meta description — important for click-through rates in SERPs
• Very thin content (1 words). Search engines need substantial content for ranking.

13 issues found

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Crawlability

Sitemap

robots.txt

2 rules

Allows all crawlers

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

F22/100

Bot Access

20/25

Machine Read.

2/25

Schema Data

0/25

Citation

0/25

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

code blocks

Text ratio:1%

Words:1

Token eff.:Too Short

Depth:1/5

Structured Data

No Schema

Citation Readiness

Opening Summary

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 (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.

60/100

Passed

Critical

Warnings

Images & Alt Text

20/20

Checks if images have descriptive alt text for screen readers and visually impaired users.

Semantic Structure

0/20

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.

3 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.

50/100

A+

<0.001 g

CO₂e / view

302 B

Page Weight

95%

Cleaner Than

New Visitor

<0.001 g

Returning (cached)

<0.001 g

Annual (10K/mo)

0 g

Emission Segments

Resource Breakdown

HTML

302 B

Green Hosting Not Verified

Seznam - II

5 recommendations

•Carbon footprint recommendation preview...

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Security Score

76%Good

Static / Informational

HTTPS

No WAF

32d

Certificate Details

Type

Domain Validated (DV)

Certificate Authority

Let's Encrypt

Key Algorithm

RSA (4096 bit)

Signature

SHA-256 with RSA

TLS Version

TLSv1.3

HTTP Protocol

HTTP/2

Valid From

09.03.2026

Valid Until

07.06.2026

Subject Alternative Names (4)

*.sdn.cz*.sdn.szn.czsdn.czsdn.szn.cz

SHA-256 Fingerprint

B8:1F:3E:04:5C:C6:A3:F0:0B:6A:51:CB:54:46:3D:98:17:1F:16:9A...

Recommendations

Security recommendation preview

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HTTP Headers

Developer Console

access-control-allow-headers

Accept-Encoding, Accept-Language, Origin, DNT

access-control-allow-methods

HEAD, GET, OPTIONS

access-control-allow-origin

content-length

content-type

text/plain; charset=utf-8

date

Tue, 05 May 2026 09:11:51 GMT

Good Warning Issue

Email Infrastructure

Custom Mail Server

Score

SPF

DKIM

DMARC

Domain Information

sdn.cz

Domain Age

17 years

Created

30.04.2009

Expires

29.04.2027

Last Updated

02.09.2022

Registrar

REG-SEZNAM

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.

32/100

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.

4 recommendations

•Mobile compatibility recommendation preview...

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Typography & Readability

Times New Roman

62/100

Readability

/30

21/30

16px · LH --

Hierarchy

/20

8/20

WCAG

/25

19/25

Performance

/25

14/25

1 font

Heading Font

Times New Roman

Body Font

Times New Roman

Serif16px

Contrast Ratio

Reading Comfort

Single Family

left aligned

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

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

⚠️ Missing font-display: swap — users may see invisible text while fonts load (FOIT).

Buy on MyFonts

Color Palette

6 unique colors

3.87:1 AA Large Light

#ffffff

Background· 99.9%

#7f8284

Other· 0%

#c0b9b1

Primary· 0%

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Website Identity

sdn.cz

17 years old

Location detected: 🇨🇿 Czech Republicvia tld

REG-SEZNAM

Sponsored

Last analyzed: 05 May 2026 at 09:12

Historical Analysis & Change Tracking