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blb-karlsruhe.de

https://blb-karlsruhe.de· First analyzed 15 May 2026· Updated 15 May 2026
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blb-karlsruhe.de
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Mobile

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Hosting Provider

BLB Karlsruhe

IP Address

193.197.86.221

Site Location

🇩🇪 Germanyvia tld

Server Location

🇩🇪 Mannheim, Germany

ASN

AS553

Organization

BLB Karlsruhe

Server

Apache

Nameservers

dns5.belwue.de.dns1.blb-karlsruhe.de.dns1.belwue.de.dns3.belwue.de.

Performance

99

Core Web Vitals

Weight

First Contentful Paint
816 ms10%
Speed Index
1.1 s10%
Largest Contentful Paint
—25%
Total Blocking Time
0.0 ms30%
Cumulative Layout Shift
0.00025%
4.2 MB
34 requests
0–49
50–89
90–100

Architecture Stack

Monolithic
⚙️ SSR
TYPO3

Technology Stack

4 Technologies Detected

Libraries

1
jQuery

UI Components

1
Swiper

CSS Frameworks

1
Tailwind CSS

Web Servers

1
Apachev2.4.41

SEO Analysis

D52/100
14
9
2
Meta Tags4/15
Content12/12
Headings3/8
Technical13/25
E-E-A-T0/7
Images2/7
Links5/5
URL5/5
Social1/5
Freshness0/4
Mobile4/4
Indexability3/3
B
blb-karlsruhe.deblb-karlsruhe.de

BLB: Home

No description available for this page.

Title Length9 chars

Recommended: 50-60 chars (~56px / 580px)

Description Length0 chars

Recommended: 120-160 chars

Issues (2)

  • • Missing meta description — important for click-through rates in SERPs
  • • Missing H1 tag — every page should have exactly one H1

11 issues found

Upgrade to view details

Crawlability

Sitemap
robots.txt

12 rules

Local SEO

Local Search Readiness

3/100
Poor
1 14 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

F36/100
Bot Access
20/25
Machine Read.
8/25
Schema Data
0/25
Citation
8/25

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:8%
Words:2,287
Token eff.:Optimal
Depth:1/5

Structured Data

No Schema

Citation Readiness

Opening Summary1779w
Descriptive Headingsavg 3.8w
Canonical URL
Open Graph1/3
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
65/100
7
Passed
4
Critical
2
Warnings
Images & Alt Text
20/20
Checks if images have descriptive alt text for screen readers and visually impaired users.
Semantic Structure
11/20
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
0/15
Checks correct use of WAI-ARIA attributes (roles, states, properties) for assistive technologies.
4 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.
21/100
F
526 mg
CO₂e / view
4.2 MB
Page Weight
15%
Cleaner Than
New Visitor
602 mg
vs
Returning (cached)
301 mg
Annual (10K/mo)
63.2 kg
Emission Segments
Data Center
118 mg
Network
126 mg
Device
283 mg
Resource Breakdown
JavaScript
333.4 KB
Images
3.2 MB
CSS
634.5 KB
HTML
29.0 KB
Green Hosting Not Verified
BLB Karlsruhe
6 recommendations
  • •Carbon footprint recommendation preview...
Upgrade to view recommendations
D

Security Score

46%Poor
Interactive

HTTPS

No WAF

168d

Certificate Details

Type

Organization Validated (OV)

Certificate Authority

Hellenic Academic and Research Institutions CA

Key Algorithm

RSA (4096 bit)

Signature

SHA-256 with RSA

TLS Version

TLSv1.3

HTTP Protocol

HTTP/1.1

Valid From

31.10.2025

Valid Until

31.10.2026

OCSP Stapling

Enabled

Subject Alternative Names (2)

blb-karlsruhe.dewww.blb-karlsruhe.de

SHA-256 Fingerprint

0F:5A:8F:49:A1:94:35:A8:36:27:90:84:8B:12:85:FD:83:BF:7D:98...

Top Recommendations

Security recommendation preview

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HTTP Headers

Developer Console

cache-control
🟡 0s(max-age=0)
connection
Keep-Alive
content-encoding
📦 Gzip(gzip)
content-language
de
content-length
29427
content-type
text/html; charset=utf-8
Good Warning Issue

Email Infrastructure

Custom Mail Server

Score

75

SPF
DKIM
DMARC

DMARC Policy

Reject (Strictest)

MX Records (4)

mx2.belwue.de
mx4.belwue.de
mx1.belwue.de
mx3.belwue.de

Domain Information

blb-karlsruhe.de

Last Updated

09.03.2026

DNSSEC
Not Enabled

Privacy & Compliance

Cookie Consent Banner
Privacy Policy
Terms of Service

GDPR Indicators

Privacy policy page linked

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.
D
51/100
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, minimum-scale=1.0, maximum-scale=1.0, user-scalable=1
4 recommendations
  • •Mobile compatibility recommendation preview...
Upgrade to view recommendations

Typography & Readability

Lato

WCAG AA
62/100
Readability
/30
20/30

18px · LH 1.39

Hierarchy
/20
8/20
WCAG
/25
19/25

6.49:1 min contrast

Performance
/25
15/25

1 font · 3 req

Heading Font

Lato

Sans

Body Font

Lato

Sans18px

Contrast Ratio

6.49:1

WCAG AA (≥4.5:1)

Reading Comfort

~40 CPL

Narrow lines
24px
h2
24px
h3
16px
h4
18px
p

✅ Excellent readability: 18px body text is ideal for all devices.

⚠️ Tight line spacing (1.39). Increase to 1.4–1.6 for better readability.

❌ Very complex text: Flesch score 19/100. Consider shorter sentences and simpler words.

✅ WCAG AA contrast: All text meets 4.5:1 ratio (min 6.5:1).

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

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

Buy on MyFontsFlesch 19

Color Palette

8 unique colors
8.08:1 AAA Light
#ffffff
Background· 25.400000000000002%
#4e514a
Other· 3.8%
#76afa8
Primary· 11.6%
#869e93
Secondary· 4.6%
#90b3ae
Secondary· 2.8%

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

9 Resources

6
Scripts
3
Styles
0
Async
1
Defer

Top Script Sources

local(6)

Website Identity

blb-karlsruhe.de

Location detected: 🇩🇪 Germanyvia tld
de-DE

Social Profiles

FacebookInstagram

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Last analyzed: 15 May 2026 at 18:43

Historical Analysis & Change Tracking