What powers 
instruct-eric.eu?
Last seen Dec 2022 · 20 technologies across 13 categories
Advertising
Twitter Ads
since Jul 2021
Analytics
Matomo Analytics
since Aug 2020
Authentication
SimpleSAMLphp
since Dec 2022
CDN
cdnjs
since Oct 2021
Cloudflare
since May 2022
JavaScript frameworks
JavaScript libraries
Operating systems
Debian
since Mar 2021
Programming languages
TypeScript
since Dec 2022
Security
UI frameworks
Web servers
Webmail
Microsoft 365
since Aug 2022
Widgets
FullCalendar
since Dec 2022
Twitter
since Apr 2019
AI Crawlers
Blocks 1 of 33 AI crawlers we track by name in its robots.txt. Checked Sep 2026.
Search and AI assistants
- PetalBot Blocked
The other 32 AI crawlers we track are not mentioned and only inherit the catch-all rules that apply to every crawler.
- robots.txt found
- llms.txt not found
- ai.txt not found
AI Crawlers
1 of 33 AI crawlers blocked
Open Page Rank
4.21 / 10 · ranked #451,185 of all domains
84 referring domains · OpenPageRank
Infrastructure
- Hosted on IN2P3 IN2P3 Autonomous System (134.158.151.41)
- DNS: Hover
- Email: Microsoft 365
- Email security: SPF (hard fail), DMARC monitor only
- SSL: Let's Encrypt, RSA 2048, expires Nov 2026
- Common Crawl link graph: rank 2,080,463, 4 hosts
- Verified with: Google, Microsoft 365
DNS records as swept Sep 2026, certificate as seen Sep 2026. How the web is hosted