What powers alerte-prefecture.fr?
Last seen Oct 2026 · 19 technologies across 9 categories
Analytics
Cloudflare Browser Insights
since Jul 2026
Google Analytics
since Jul 2026
Microsoft Clarity
since Sep 2026
CDN
Cloudflare
since Jul 2026
Issue trackers
Sentry
since Oct 2026
JavaScript frameworks
JavaScript libraries
Miscellaneous
Performance
Cloudflare Rocket Loader
since Jul 2026
Priority Hints
since Jul 2026
Programming languages
Node.js
since Jul 2026
UI frameworks
Radix UI
since Jul 2026
Tailwind CSS
since Jul 2026
AI Crawlers
Doesn't name any of the 33 AI crawlers we track in its robots.txt. Catch-all rules (User-agent: *) restrict some paths for every crawler, AI or not. Checked Oct 2026.
- robots.txt found
- llms.txt not found
- ai.txt not found
- Sep 2026 bytespider removed from robots.txt
- Sep 2026 amazonbot removed from robots.txt
- Sep 2026 applebot-extended removed from robots.txt
- Sep 2026 meta-externalagent removed from robots.txt
- Sep 2026 ccbot removed from robots.txt
- Sep 2026 claudebot removed from robots.txt
AI Crawlers
No AI crawlers blocked
Audience
- 66% phone
- 34% desktop
France
Where the site's Chrome visitors come from, largest estimated audience first.
Core Web Vitals
| LCP | 1.4 s |
| INP | 150 ms |
| CLS | 0.55 |
| TTFB | 400 ms |
Real user p75, Chrome UX Report, Sep 2026.
Page
- Language: French
- CDN: Cloudflare
- Weight: 1.3 MB · 71 requests
- Structured data: JSON-LD, OpenGraph, Twitter Cards
Homepage as crawled by the HTTP Archive, Oct 2026.
Organisation
- Alerte Préfecture
From the homepage's own structured data (Oct 2026).
Infrastructure
- Hosted on Cloudflare (104.21.87.251, IPv6)
- DNS: Cloudflare DNS
- Email: Cloudflare Email Routing
- Email security: SPF (soft fail), DMARC monitor only
- SSL: Google Trust Services, ECDSA P256, wildcard, expires Jan 2027
- Verified with: Brevo, Firebase, Google
DNS records as swept Oct 2026, certificate as seen Oct 2026. How the web is hosted
Full technology history →
Report an incorrect detection
Recent changes
- detected core-js Oct 2026
- detected Facebook Pixel Oct 2026
- detected Sentry Oct 2026
- dropped HSTS Sep 2026
- detected Microsoft Clarity Sep 2026
- dropped Vercel Sep 2026
- dropped Vercel Analytics Sep 2026