What does StackOptic analyze?

StackOptic runs 18 analysis modules on any public website from a single URL. It detects 7,000+ technologies (CMS, frameworks, analytics, payments, CDN, hosting), evaluates SSL certificates and HTTP security headers with grades from A+ to F, measures Core Web Vitals (LCP, CLS, TBT, FCP), audits SEO meta tags and structured data, checks email security (SPF, DKIM, DMARC), analyzes AI & LLM readiness including bot access and llms.txt validation, extracts color palettes and typography, estimates carbon footprint, and generates permanent shareable reports.

Does it work on sites behind Cloudflare or bot protection?

Yes. StackOptic uses a real browser engine that loads pages exactly like a human visitor — executing JavaScript, rendering CSS, and handling redirects. This allows it to bypass Cloudflare, LiteSpeed, Sucuri, and other bot protection systems where traditional crawlers and HTTP-only tools fail.

What do I get on the free plan?

The free plan includes 5 analyses per day with access to all 18 modules, full scores, technology detection, and security grades. Every report is permanently accessible via a unique shareable URL — no login required to view. No credit card needed. AI-powered insights, re-analysis, PDF/JSON export, and comparison features are available on Pro ($24/mo) and Agency ($99/mo) plans.

What is AI & LLM readiness analysis?

This module evaluates how visible and citable your website is to AI search engines like ChatGPT, Perplexity, Google AI Overviews, and Claude. It audits access permissions for 8 major AI bots, validates llms.txt and llms-full.txt files, scores citation-ready content structure, and analyzes structured data (JSON-LD) for GEO readiness — helping you rank in the next generation of search.

How long does an analysis take?

Most analyses complete in under 10 seconds. StackOptic runs all 18 modules in parallel using a real browser session, so you get technology detection, security audit, performance metrics, SEO analysis, and AI readiness scoring simultaneously.

How accurate are the results?

Detection is based on real browser execution — DOM inspection, JavaScript runtime analysis, HTTP headers, and DNS records. With 7,000+ technology signatures and Lighthouse-calibrated performance scoring, StackOptic achieves high accuracy for mainstream technologies.

What security checks are performed?

The security module evaluates SSL/TLS certificates, 12+ HTTP security headers (HSTS, CSP, X-Frame-Options, Permissions-Policy, Referrer-Policy), HTTPS enforcement, and email authentication (SPF, DKIM, DMARC). Each site receives a letter grade from A+ to F with specific remediation steps.

Do you store the websites I analyze?

StackOptic only stores publicly available information that any visitor to a website would see — HTML content, HTTP headers, DNS records, and screenshots. We do not access private data, log in to websites, or perform any intrusive testing.

Back to Search

public.lu

https://public.lu· First analyzed 15 Feb 2026· Updated 15 Feb 2026

Export

public.lu

Mobile

Sponsored

Hosting Provider

Public Services

IP Address

185.106.24.133

Server Location

🇱🇺 Luxembourg, Luxembourg

ASN

AS25094

Organization

Public Services

Server

Apache

Nameservers

ns1.etat.lu.ns3.etat.lu.ns2.etat.lu.

Performance

Page Speed

514 KB

24 requests

Image Optimization

Responsive

0–49

50–89

90–100

Architecture Stack

Monolithic

⚙️ SSR

Adobe Experience Manager

Progressive Web App

Web ManifestApple Touch IconTheme Color

Technology Stack

2 Technologies Detected

CSS Frameworks

Tailwind CSS

Web Servers

Apache

SEO Analysis

D52/100

public.lupublic.lu

etat.lu - L'annuaire des sites publics luxembourgeois

L'annuaire des sites publics luxembourgeois

Title Length53 chars

Recommended: 50-60 chars

Description Length43 chars

Recommended: 120-160 chars

Issues (1)

• Missing H1 tag - every page should have one H1

6 issues found

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Sponsored

Security Score

31%Critical

Interactive

HTTPS

No WAF

205d

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

08.09.2025

Valid Until

08.09.2026

OCSP Stapling

Enabled

Subject Alternative Names (2)

*.public.lupublic.lu

SHA-256 Fingerprint

A3:4D:38:87:00:B6:8B:19:71:C3:BE:75:27:AD:74:98:D1:89:D5:5E...

Top Recommendations

Security recommendation preview

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HTTP Headers

Developer Console

date

Sun, 15 Feb 2026 04:21:49 GMT

server

Apache

accept-ranges

bytes

vary

Accept-Encoding

content-encoding

📦 Gzip(gzip)

x-frame-options

DENY

Good Warning Issue

Email Infrastructure

Custom Mail Server

Score

SPF

DKIM

DMARC

DMARC Policy

Reject (Strictest)

MX Records (4)

incoming-3.mail.etat.lu

incoming-4.mail.etat.lu

incoming-1.mail.etat.lu

incoming-2.mail.etat.lu

Domain Information

public.lu

DNSSEC

Not Enabled

Typography & Readability

Helvetica + Times new roman

53/100

Readability

/30

32/40

14px · LH 1.40

Hierarchy

/20

18/25

2.86x ratio

WCAG

/25

5/15

Contrast: undefined

Performance

/25

13/20

2 fonts

Heading Font

Helvetica

Sans40px

Body Font

Times new roman

Serif14px

Contrast Ratio

Reading Comfort

~79 CPL

Optimal (45–75)

40px

22px

14px

⚠️ Small text: 14px may be hard to read on mobile. Consider 16px+.

✅ Optimal line spacing: 1.40 ratio ensures comfortable reading.

✅ Strong hierarchy: Headlines are 2.9x larger than body text.

✅ Good performance: Using 2 font families keeps load times fast.

⚠️ Risky: Text appears on background images without overlay protection.

✅ Optimal line length: ~79 characters per line is comfortable to read.

Buy on MyFonts

Business & Marketing Stack

1 Tools Detected

Growing

Behavior Analytics

Google AnalyticsFree

User behavior and product analytics

Sponsored

Scripts & Styles

6 Resources

Scripts

Styles

Async

Defer

Top Script Sources

local(2)cdn.public.lu(1)

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Last analyzed: 15 Feb 2026 at 04:22

Historical Analysis & Change Tracking