What powers 
esi.nl?
Last seen Mar 2026 · 14 technologies across 10 categories
Analytics
Piwik PRO Core
since Jun 2023
Databases
Firebase
since Sep 2022
JavaScript frameworks
JavaScript libraries
Miscellaneous
Programming languages
Node.js
since Aug 2022
Security
HSTS
since Sep 2022
UI frameworks
Vuetify
since Aug 2022
Webmail
Microsoft 365
since Sep 2024
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 found
- ai.txt not found
AI Crawlers
No AI crawlers blocked
Standards: llms.txt
Open Page Rank
4.37 / 10 · ranked #422,727 of all domains
50 referring domains · OpenPageRank
Infrastructure
- Hosted on COMSENSO (185.38.232.172, IPv6)
- DNS: surfnet.nl
- Email: Microsoft 365
- Email security: no SPF record, no DMARC record
- SSL: HARICA, RSA 4096, expires Feb 2027
- Common Crawl link graph: rank 2,239,073, 9 hosts
DNS records as swept Sep 2026, certificate as seen Sep 2026. How the web is hosted