What powers 
ens.fr?
Last seen Aug 2026 · 139 technologies across 38 categories
Accessibility
Advertising
Analytics
Authentication
Caching
CDN
CMS
Cookie compliance
CRM
Databases
Ecommerce
Font Scripts
Hosting
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JavaScript Frameworks
JavaScript graphics
JavaScript libraries
Maps
Miscellaneous
Mobile frameworks
Operating systems
Page builders
Performance
Programming languages
Rich text editors
Security
Tag managers
UI frameworks
Video players
Web frameworks
Web Mail
Web server extensions
Web Servers
Webmail
Widgets
Wikis
WordPress plugins
WordPress themes
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 Sep 2026.
- robots.txt found
- llms.txt not found
- ai.txt not found
Top backlinks
Top links pointing at the site, one per source domain, strongest first. The anchor text opens the page carrying the link.
AI Crawlers
No AI crawlers blocked
Audience
- 54% phone
- 43% desktop
- 3% tablet
France
India
United States
Algeria
Morocco
Canada
Where the site's Chrome visitors come from, largest estimated audience first.
Open Page Rank
8.27 / 10 · ranked #4,291 of all domains
4,265 referring domains · OpenPageRank
Core Web Vitals
| LCP | 1.8 s |
| INP | 75 ms |
| CLS | 0 |
| TTFB | 900 ms |
Real user p75, Chrome UX Report, Aug 2026.
Page
- Language: English (United States)
- Weight: 0.9 MB · 18 requests
- WordPress theme: gateway · all themes
Homepage as crawled by the HTTP Archive, Sep 2026.
Similar sites
sparceurope.org 5 shared
obs-mip.fr 6 sharedpolytechnique.fr 5 shared
lbi.org 3 shared- ac-guyane.fr 3 shared
- limoges.fr 3 shared
- karlstad.se 4 shared
- nfe.go.th 4 shared
Closest technology stacks among the highest-authority sites we track; "shared" counts the distinctive technologies in common.
Organisation
- Département de physique (ENS - PSL) (Institut des textes et manuscrits modernes on Wikidata)
- Founded: 1968
- Country: France
- Profiles: Facebook
From the homepage's own structured data (Sep 2026) and Wikidata (CC0).
Infrastructure
- Registered Dec 1994 (31 years) via GIP RENATER, renews Dec 2026
- Hosted on FR-RENATER Reseau National de telecommunications pour la Technologie (129.199.166.211)
- DNS: lri.fr
- Email: renater.fr
- Email security: SPF (neutral), DMARC monitor only
- SSL: HARICA, ECDSA P256, expires Sep 2026
- Common Crawl link graph: rank 10,604, 537 hosts
- Verified with: Apple Business, Google, Microsoft 365
DNS records as swept Sep 2026, certificate as seen Sep 2026, registration from the registry's RDAP service. How the web is hosted
Subdomains
| Host | Techs |
|---|---|
| www.math.ens.fr | 27 |
| cmh.ens.fr | 24 |
| www.cmh.ens.fr | 23 |
| www.lmd.ens.fr | 23 |
| www.geosciences.ens.fr | 21 |
| www.cineclub.ens.fr | 20 |
| www.fondation.ens.fr | 20 |
| www.geologie.ens.fr | 20 |
| cloud.dma.ens.fr | 19 |
| cloud.eleves.ens.fr | 19 |
| www.chimie.ens.fr | 19 |
| philosophie.ens.fr | 18 |
| phorum.ens.fr | 17 |
| caphes.ens.fr | 16 |
| cm2.ens.fr | 16 |
| cognition.ens.fr | 16 |
| documents.ens.fr | 16 |
| www.documents.ens.fr | 16 |
| bds.ens.fr | 15 |
| economie.ens.fr | 15 |
| lnc2.dec.ens.fr | 15 |
| lscp.dec.ens.fr | 15 |
| lsp.dec.ens.fr | 15 |
| www.antiquite.ens.fr | 15 |
Full technology history →
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