What powers esff.fr?
Last seen Sep 2026 · 22 technologies across 13 categories
CMS
Databases
MySQL
since May 2020
Font scripts
Google Font API
since Jan 2023
Hosting
IONOS
since Aug 2022
JavaScript libraries
Select2
since Jan 2023
Miscellaneous
Operating systems
Debian
since Jan 2023
Page builders
Divi
since Feb 2024
Performance
Priority Hints
since Feb 2024
Programming languages
PHP
since May 2020
Web servers
Apache HTTP Server
since May 2020
Webmail
Microsoft 365
since Aug 2022
WordPress plugins
Autoptimize
since Feb 2024
Contact Form 7
since Mar 2022
WordPress Super Cache
since Feb 2024
Yoast SEO
since Feb 2024
AI Crawlers
Doesn't mention any of the 33 AI crawlers we track in its robots.txt; all are allowed by default. Checked Sep 2026.
- robots.txt found
- llms.txt not found
- ai.txt not found
AI Crawlers
No AI crawlers blocked
Audience
France
Where the site's Chrome visitors come from, largest estimated audience first.
Open Page Rank
2.95 / 10 · ranked #1,682,247 of all domains
23 referring domains · OpenPageRank
Core Web Vitals
| LCP | 3.6 s |
| INP | 50 ms |
| CLS | 0 |
| TTFB | 3000 ms |
Real user p75, Chrome UX Report, Sep 2026.
Page
- Language: French (France)
- Weight: 3.2 MB · 43 requests
- WordPress theme: divi (child: esff) · all themes
- Structured data: JSON-LD, OpenGraph, Twitter Cards
Homepage as crawled by the HTTP Archive, Oct 2026.
Organisation
- Ecole supérieure de fonderie et de forge
- Founded: 1923
- Country: France
From Wikidata (CC0).
Infrastructure
- Hosted on IONOS (217.160.0.158, IPv6)
- DNS: IONOS
- Email: Microsoft 365
- Email security: SPF (soft fail), no DMARC record
- SSL: Sectigo, RSA 2048, wildcard, expires Mar 2027
- Common Crawl link graph: rank 8,205,048, 3 hosts
- Verified with: Microsoft 365
DNS records as swept Aug 2026, certificate as seen Sep 2026. How the web is hosted
Subdomains
| Host | Techs |
|---|---|
| www.esff.fr | 18 |
| intranet.esff.fr | 10 |