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eru.cz

https://eru.cz· First analyzed 22 May 2026· Updated 22 May 2026
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eru.cz
Desktop screenshot of eru.cz
Mobile screenshot of eru.cz
Mobile

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Hosting Provider

Internet for school

IP Address

194.228.82.14

Site Location

🇨🇿 Czech Republicvia tld

Server Location

🇨🇿 Prague, Czechia

ASN

AS5610

Organization

Internet for school

Server

Apache

Nameservers

ns2.ignum.cz.ns1.ignum.com.

Performance

100

Core Web Vitals

Weight

First Contentful Paint
622 ms10%
Speed Index
809 ms10%
Largest Contentful Paint
—25%
Total Blocking Time
0.0 ms30%
Cumulative Layout Shift
0.00025%
910 KB
180 requests

Image Optimization

Lazy Load
0–49
50–89
90–100

Architecture Stack

Monolithic
⚙️ SSR
Drupal

Technology Stack

12 Technologies Detected

Libraries

3
jQuery
jQuery UI
Moment.js

CSS Frameworks

2
Bootstrap
Tailwind CSS

UI Components

1
Slick Carousel

Other

1
Modernizr

Icon Libraries

1
Font Awesome

Fonts

1
Google Fonts

Analytics

1
Google Analytics

Tag Managers

1
Google Tag Manager

Web Servers

1
Apache

SEO Analysis

C67/100
19
5
2
Meta Tags7/15
Content11/12
Headings8/8
Technical18/25
E-E-A-T0/7
Images2/7
Links5/5
URL5/5
Social4/5
Freshness0/4
Mobile4/4
Indexability3/3
E
eru.czeru.cz

Energetický regulační úřad | eru.gov.cz

No description available for this page.

Title Length39 chars

Recommended: 50-60 chars (~230px / 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 (17/18) — critical for accessibility and SEO

7 issues found

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Crawlability

Sitemap

Type: index

5 URLs

5 sub-sitemaps

robots.txt

45 rules

Local SEO

Local Search Readiness

10/100
Poor
4 11 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

D46/100
Bot Access
20/25
Machine Read.
11/25
Schema Data
0/25
Citation
15/25

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
nav
Text ratio:6%
Words:1,393
Token eff.:Optimal
Sections/1K:6.5
Depth:1/5

Structured Data

No Schema

Citation Readiness

Opening Summary38w
Descriptive Headingsavg 4.5w
Canonical URL
Open Graph2/3
Twitter Card2/3
Language Tag
Publish Date
Author Info
Lists
Tables
TL;DR / Summary
About Page Link
Recommendations (10)
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
83/100
14
Passed
3
Critical
1
Warnings
Images & Alt Text
18/20
Checks if images have descriptive alt text for screen readers and visually impaired users.
Semantic Structure
17/20
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
9/15
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.
53/100
B
113 mg
CO₂e / view
909.9 KB
Page Weight
80%
Cleaner Than
New Visitor
129 mg
vs
Returning (cached)
64 mg
Annual (10K/mo)
13.5 kg
Emission Segments
Data Center
25 mg
Network
27 mg
Device
60 mg
Resource Breakdown
JavaScript
594.1 KB
Images
109.0 KB
CSS
188.6 KB
Fonts
987 B
HTML
17.2 KB
Green Hosting Not Verified
Internet for school
4 recommendations
  • •Carbon footprint recommendation preview...
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A

Security Score

81%Very Good
Interactive

HTTPS

No WAF

86d

Certificate Details

Type

Domain Validated (DV)

Certificate Authority

Let's Encrypt

Key Algorithm

ECDSA (secp384r1) (384 bit)

Signature

ECDSA with SHA-384

TLS Version

TLSv1.3

HTTP Protocol

HTTP/2

Valid From

18.05.2026

Valid Until

16.08.2026

Subject Alternative Names (2)

eru.gov.czwww.eru.gov.cz

SHA-256 Fingerprint

D4:18:C6:D7:24:E1:F2:FA:FB:9F:72:6B:41:18:62:90:AC:20:71:C4...

Top Recommendations

Security recommendation preview

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HTTP Headers

Developer Console

access-control-allow-origin
*
cache-control
🟡 1 Hours(max-age=3600, public)
content-encoding
📦 Gzip(gzip)
content-language
cs
content-length
17319
content-security-policy
default-src 'unsafe-inline' 'self' data: *.eru.cz *.eru.gov....
Good Warning Issue

Email Infrastructure

Custom Mail Server

Score

95

SPF
DKIM
DMARC

DMARC Policy

None (Monitor Only)

MX Records (2)

relay.eru.cz
mail.eru.cz

Domain Information

eru.cz

Domain Age
25y 5m

Created

12.12.2000

Expires

12.12.2027

Last Updated

08.11.2022

Registrar

REG-WEBGLOBE

DNSSEC
Not Enabled

Privacy & Compliance

Cookiebot

Cookie Consent Banner
Cookiebot
Privacy Policy
Terms of Service

GDPR Indicators

Cookie consent banner detected
CMP: Cookiebot
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
69/100
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, viewport-fit=cover
1 recommendation
  • •Mobile compatibility recommendation preview...
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Typography & Readability

Roboto

WCAG Partial
72/100
Readability
/30
20/30

16px · LH 1.50

Hierarchy
/20
17/20

2.5x ratio · ✓ H1→H6

WCAG
/25
17/25

1.06:1 min contrast

Performance
/25
18/25

System fonts

Heading Font

Roboto

Sans40px

Body Font

Roboto

Sans16px

Contrast Ratio

1.06:1

8 issues

Reading Comfort

~36 CPL

Narrow lines
40px
h1
40px
h2
20px
h3
16px
p

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

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

❌ Very complex text: Flesch score 6/100. Consider shorter sentences and simpler words.

⚠️ Partial contrast: 8 elements below WCAG AA threshold (min 1.1:1).

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

✅ Strong hierarchy: Headlines are 2.5x larger than body text.

GGoogle FontsFlesch 6

Color Palette

7 unique colors
5.99:1 AA Light
#ffffff
Background· 31.3%
#636365
Other· 9.700000000000001%
#596387
Secondary· 25.3%
#253160
Primary· 19.1%
#d32e26
Primary· 5.1%

Business & Marketing Stack

3 Tools Detected

Advanced

Behavior Analytics

2
Google Tag ManagerFree
Google AnalyticsFree

User behavior and product analytics

Privacy & Cookies

1
CookiebotMid-Market

Cookie consent and privacy compliance tools

2

Categories

3

Total Tools

0

Enterprise

1

Mid-Market

Assessment: Well-developed marketing technology stack

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Scripts & Styles

30 Resources

20
Scripts
10
Styles
0
Async
2
Defer

Top Script Sources

local(20)

Website Identity

eru.cz

[email protected]
25 years old
Location detected: 🇨🇿 Czech Republicvia tld
REG-WEBGLOBEcs

Social Profiles

FacebookLinkedIn

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Last analyzed: 22 May 2026 at 05:26

Historical Analysis & Change Tracking

eru.cz Technology Stack - Built With jQuery, jQuery UI, Moment.js, Slick Carousel, Modernizr | StackOptic | StackOptic