What powers 
iszl.ch?
Last seen Sep 2026 · 41 technologies across 24 categories
Analytics
Authentication
Caching
CDN
CMS
Cookie compliance
Databases
Editors
Font scripts
Issue trackers
JavaScript frameworks
JavaScript graphics
JavaScript libraries
Miscellaneous
PaaS
Performance
Programming languages
Security
SEO
Tag managers
UI frameworks
Webmail
WordPress plugins
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
- Oct 2026 *: Restricted (was Allowed)
AI Crawlers
No AI crawlers blocked
Standards: llms.txt
Audience
- 65% desktop
- 35% phone
Switzerland
Where the site's Chrome visitors come from, largest estimated audience first.
Open Page Rank
3.65 / 10 · ranked #789,139 of all domains
28 referring domains · OpenPageRank
Core Web Vitals
| LCP | 2.3 s |
| INP | 75 ms |
| CLS | 0 |
| TTFB | 1000 ms |
Real user p75, Chrome UX Report, Aug 2026.
Page
- Language: English (United Kingdom)
- CDN: Cloudflare
- Weight: 3.3 MB · 77 requests
- WordPress theme: international-school-of-zug-and-luzern-2024-iszl · all themes
- Structured data: JSON-LD, OpenGraph, Twitter Cards
Homepage as crawled by the HTTP Archive, Sep 2026.
Organisation
- International School of Zug and Luzern
- Founded: 1961
- Country: Switzerland
- Profiles: Facebook, Instagram, YouTube
From the homepage's own structured data (Sep 2026) and Wikidata (CC0).
Infrastructure
- Hosted on Cloudflare (162.159.134.42)
- DNS: swizzonic.ch
- Email: Google Workspace
- Email security: SPF (hard fail), DMARC reject, DNSSEC signed, BIMI
- SSL: Let's Encrypt, ECDSA P256, expires Jan 2027
- Common Crawl link graph: rank 221,488, 6 hosts
- Verified with: Apple Business, Google, Jamf, LinkedIn, Microsoft 365
DNS records as swept Oct 2026, certificate as seen Oct 2026. How the web is hosted
Subdomains
| Host | Techs |
|---|---|
| www.iszl.ch | 28 |
| portal.iszl.ch | 21 |
Full technology history →
Report an incorrect detection
Recent changes
- dropped Tailwind CSS Aug 2026
- detected Linkedin Insight Tag Jun 2026
- detected HSTS May 2026
- dropped Site Kit Mar 2026
- dropped Twitter Emoji (Twemoji) Feb 2026
- detected Priority Hints Jan 2026
- detected WP Rocket Jan 2026
- detected Site Kit Dec 2025
- detected Twitter Emoji (Twemoji) Dec 2025