What powers kostka-skola.cz?
Last seen Sep 2026 · 13 technologies across 8 categories
Font scripts
Google Font API
since Apr 2019
JavaScript libraries
Miscellaneous
HTTP/3
since Feb 2023
Open Graph
since Sep 2024
Operating systems
Ubuntu
since Oct 2024
Programming languages
Security
HSTS
since Sep 2022
Web servers
Webmail
Microsoft 365
since Aug 2022
AI Crawlers
robots.txt could not be read at the last check (Sep 2026), so its policy is unknown.
- robots.txt not checked
- llms.txt not checked
- ai.txt not checked
AI Crawlers
Policy unknown
Audience
- 82% phone
- 18% desktop
Czechia
Where the site's Chrome visitors come from, largest estimated audience first.
Open Page Rank
2.60 / 10 · ranked #2,323,787 of all domains
12 referring domains · OpenPageRank
Core Web Vitals
| LCP | 0.7 s |
| INP | 300 ms |
| CLS | 0 |
| TTFB | 300 ms |
Real user p75, Chrome UX Report, Aug 2026.
Page
- Language: Czech
- Weight: 1.8 MB · 61 requests
- Structured data: JSON-LD, OpenGraph
Homepage as crawled by the HTTP Archive, Sep 2026.
Infrastructure
- Hosted on CASABLANCA-AS Internet & Collocation Provider (217.11.242.62, IPv6)
- Email: no MX record returned, SPF names Microsoft 365
- Email security: SPF (hard fail), DMARC quarantine, DNSSEC signed
- Common Crawl link graph: rank 8,520,121, 5 hosts
- Verified with: Adobe
DNS records as swept Aug 2026. How the web is hosted
Subdomains
| Host | Techs |
|---|---|
| kostka-skola.cz | 6 |
| print.kostka-skola.cz | 6 |
| www.kostka-skola.cz | 6 |
| jidelna.kostka-skola.cz | 4 |
| safeq.kostka-skola.cz | 3 |
Full technology history →
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Recent changes
- dropped Bootstrap Dec 2025
- dropped Google Code Prettify Dec 2025
- dropped Google Maps Dec 2025
- dropped Microsoft Word Dec 2025
- dropped OWL Carousel Dec 2025