What powers 
ens.fr?
Last seen Sep 2026 · 141 technologies across 38 categories
Accessibility
Advertising
Analytics
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Caching
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CMS
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Miscellaneous
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Performance
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Rich text editors
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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
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
- 48% desktop
- 48% phone
- 4% tablet
France
United Kingdom
India
Germany
Canada
United States
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, Sep 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 sharedpolytechnique.fr 5 shared
lbi.org 3 shared- ac-guyane.fr 3 shared
aubervilliers.fr 3 shared
- aveyron.fr 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: no SPF record, no DMARC record
- SSL: HARICA, ECDSA P256, expires Apr 2027
- Common Crawl link graph: rank 10,604, 537 hosts
DNS records as swept Oct 2026, certificate as seen Oct 2026, registration from the registry's RDAP service. How the web is hosted
Subdomains
| Host | Techs |
|---|---|
| www.math.ens.fr | 27 |
| www.chimie.ens.fr | 25 |
| 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 |
| 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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