circl.lu

https://circl.lu· First analyzed 04 May 2026· Updated 04 May 2026

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circl.lu

Mobile

Sponsored

Hosting Provider

Circl PUB

IP Address

185.194.93.14

Site Location

🇱🇺 Luxembourgvia tld

Server Location

🇱🇺 Schieren, Luxembourg

ASN

AS197869

Organization

Circl PUB

Server

Apache

Nameservers

ns-c.eurodns.eu.ns-d.eurodns.biz.ns-a.eurodns.com.ns-b.eurodns.org.

Performance

100

Core Web Vitals

Weight

First Contentful Paint

453 ms10%

Speed Index

589 ms10%

Largest Contentful Paint

—25%

Total Blocking Time

0.0 ms30%

Cumulative Layout Shift

0.00025%

220 KB

11 requests

0–49

50–89

90–100

Architecture Stack

Monolithic

⚙️ SSR

Infrastructure

Hosting

Circl PUB

Technology Stack

3 Technologies Detected

CSS Frameworks

Tailwind CSS

Icon Libraries

Font Awesome

Web Servers

Apache

SEO Analysis

D55/100

Meta Tags7/15

Content12/12

Headings3/8

Technical14/25

E-E-A-T0/7

Images2/7

Links5/5

URL5/5

Social0/5

Freshness0/4

Mobile4/4

Indexability3/3

circl.lucircl.lu

CIRCL » CIRCL -- Computer Incident Response Center Luxembourg -- CS...

The Computer Incident Response Center Luxembourg (CIRCL) is a government-driven initiative designed to gather, review, report and respond to computer securit...

Title truncated. Description truncated.

Title Length78 chars

Recommended: 50-60 chars (~478px / 580px)

Description Length353 chars

Recommended: 120-160 chars

Issues (1)

• Title is too long (78 chars, ~478px). Will be truncated in search results.

12 issues found

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Crawlability

Sitemap

Type: standard

809 URLs

robots.txt

2 rules

Allows all crawlers

Local SEO

Local Search Readiness

6/100

Poor

2 13 2

This site doesn't appear to be a local business. Local SEO signals are optional for non-local websites.

Sponsored

AI & LLM Readiness

D40/100

Bot Access

20/25

Machine Read.

14/25

Schema Data

0/25

Citation

6/25

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

navheader/footer

Text ratio:44%

Words:1,197

Token eff.:Optimal

Sections/1K:3.3

Depth:2/5

Structured Data

No Schema

Citation Readiness

Opening Summary24w

Descriptive Headingsavg 2.8w

Canonical URL

Open Graph0/3

Twitter Card0/3

Language Tag

Publish Date

Author Info

Lists

Tables

TL;DR / Summary

About Page Link

Recommendations (9)

AI readiness recommendation preview...

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Sponsored

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

10/20

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

Semantic Structure

15/20

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.

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.

63/100

A+

27 mg

CO₂e / view

219.8 KB

Page Weight

95%

Cleaner Than

New Visitor

31 mg

Returning (cached)

16 mg

Annual (10K/mo)

3.3 kg

Emission Segments

Data Center

6 mg

Network

7 mg

Device

15 mg

Resource Breakdown

Images

37.2 KB

CSS

176.6 KB

HTML

5.9 KB

Green Hosting Not Verified

Circl PUB

3 recommendations

•Carbon footprint recommendation preview...

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Security Score

76%Good

Interactive

HTTPS

No WAF

153d

Certificate Details

Type

Organization Validated (OV)

Certificate Authority

DigiCert Inc

Key Algorithm

RSA (2048 bit)

Signature

SHA-256 with RSA

TLS Version

TLSv1.2

HTTP Protocol

HTTP/1.1

Valid From

20.03.2026

Valid Until

04.10.2026

OCSP Stapling

Enabled

Subject Alternative Names (2)

*.circl.lucircl.lu

SHA-256 Fingerprint

A4:AF:72:23:19:F0:2C:C2:75:3C:FB:67:04:8F:2A:D0:BB:B0:86:86...

Top Recommendations

Security recommendation preview

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HTTP Headers

Developer Console

accept-ranges

bytes

connection

Keep-Alive

content-encoding

📦 Gzip(gzip)

content-length

5732

content-security-policy

default-src 'self' 'unsafe-inline' 'unsafe-eval' circl.lu ww...

content-type

text/html

Good Warning Issue

Email Infrastructure

Custom Mail Server

Score

SPF

DKIM

DMARC

DMARC Policy

None (Monitor Only)

MX Records (1)

cppy.circl.lu

Domain Information

circl.lu

DNSSEC

Not Enabled

Privacy & Compliance

Cookie Consent Banner

GDPR Indicators

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.

49/100

Not 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

2 recommendations

•Mobile compatibility recommendation preview...

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Typography & Readability

Raleway

WCAG Partial

59/100

Readability

/30

16/30

15px · LH 1.33

Hierarchy

/20

11/20

1.67x ratio

WCAG

/25

17/25

1.67:1 min contrast

Performance

/25

15/25

1 font · 2 req

Heading Font

Raleway

Sans25px

Body Font

Raleway

Sans15px

Contrast Ratio

1.67:1

22 issues

Reading Comfort

~48 CPL

Optimal (45–75)

25px

15px

⚠️ Small text: 15px may strain on mobile. Use ≥16px for WCAG compliance.

⚠️ Tight line spacing (1.33). Increase to 1.4–1.6 for better readability.

✅ Optimal line length: ~48 chars/line (ideal 45–75 CPL).

❌ Very complex text: Flesch score 0/100. Consider shorter sentences and simpler words.

⚠️ Partial contrast: 22 elements below WCAG AA threshold (min 1.7:1).

⚠️ Minor heading issue: 1 level skip(s) detected. Maintain sequential order for screen readers.

Buy on MyFontsFlesch 0

Color Palette

6 unique colors

6.23:1 AA Light

#ffffff

Background· 76%

#685d6c

Other· 0.6%

#446d7f

Primary· 13.199999999999998%

Business & Marketing Stack

1 Tools Detected

Growing

Behavior Analytics

Google AnalyticsFree

User behavior and product analytics

Sponsored

Scripts & Styles

2 Resources

Scripts

Styles

Async

Defer

Top Script Sources

Website Identity

circl.lu

Location detected: 🇱🇺 Luxembourgvia tld

Social Profiles

X (Twitter)GitHub

Sponsored

Last analyzed: 04 May 2026 at 19:04

Historical Analysis & Change Tracking