What powers 
ostrov.cz?
Last seen Oct 2026 · 21 technologies across 12 categories
Analytics
CDN
JavaScript libraries
Miscellaneous
Programming languages
Security
UI frameworks
Video players
Web frameworks
Web servers
Webmail
Widgets
AI Crawlers
Blocks 2 of 33 AI crawlers we track by name in its robots.txt. Checked Nov 2026.
Training crawlers
- ClaudeBot Blocked
Search and AI assistants
- Amazonbot Blocked
The other 31 AI crawlers we track are not mentioned and stay allowed by default.
- robots.txt found
- llms.txt not found
- ai.txt not found
AI Crawlers
2 of 33 AI crawlers blocked
Audience
- 64% phone
- 36% desktop
Czechia
Where the site's Chrome visitors come from, largest estimated audience first.
Open Page Rank
4.72 / 10 · ranked #301,083 of all domains
112 referring domains · OpenPageRank
Core Web Vitals
| LCP | 1.4 s |
| INP | 75 ms |
| CLS | 0 |
| TTFB | 800 ms |
Real user p75, Chrome UX Report, Sep 2026.
Page
- Language: Czech
- Weight: 7.2 MB · 85 requests
Homepage as crawled by the HTTP Archive, Oct 2026.
Organisation
- Ostrov
- Country: Czech Republic
From Wikidata (CC0).
Infrastructure
- Registered Jun 1998 (28 years) via WEDOS Internet, a.s., renews Oct 2027
- Hosted on DigitalOcean (144.126.244.91)
- DNS: wedos.com
- Email: Microsoft 365
- Email security: SPF (hard fail), no DMARC record, DNSSEC signed
- SSL: Let's Encrypt, RSA 4096, expires Dec 2026
- Common Crawl link graph: rank 1,317,117, 10 hosts
- Verified with: Microsoft 365
DNS records as swept Nov 2026, certificate as seen Nov 2026, registration from the registry's RDAP service. How the web is hosted
Subdomains
| Host | Techs |
|---|---|
| ostrov.cz | 15 |
| www.ostrov.cz | 14 |
| zakazky.ostrov.cz | 6 |
| cykloportal.ostrov.cz | 5 |
| kalendar.ostrov.cz | 3 |
Full technology history →
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Recent changes
- detected YouTube Feb 2026