What powers speleo.cz?
Last seen Aug 2026 · 9 technologies across 6 categories
JavaScript libraries
Miscellaneous
Open Graph
since Sep 2022
Operating systems
Windows Server
since Jul 2020
Security
HSTS
since Sep 2022
Web frameworks
Web servers
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 Sep 2026.
- robots.txt found
- llms.txt not found
- ai.txt not found
AI Crawlers
No AI crawlers blocked
Audience
- 77% phone
- 23% desktop
Czechia
Where the site's Chrome visitors come from, largest estimated audience first.
Open Page Rank
4.58 / 10 · ranked #390,127 of all domains
79 referring domains · OpenPageRank
Core Web Vitals
| LCP | 0.8 s |
| INP | 275 ms |
| CLS | 0 |
| TTFB | 300 ms |
Real user p75, Chrome UX Report, Aug 2026.
Page
- Language: Czech
- Weight: 2.7 MB · 45 requests
- Structured data: OpenGraph
Homepage as crawled by the HTTP Archive, Sep 2026.
Organisation
- Czech Speleological Society
- Founded: 1990
- Country: Czech Republic
From Wikidata (CC0).
Infrastructure
- Hosted on ZONER-AS (217.198.119.76)
- DNS: grdns.cz
- Email: Google Workspace
- Email security: SPF (soft fail), no DMARC record, DNSSEC signed
- SSL: Let's Encrypt, RSA 3072, expires Nov 2026
- Common Crawl link graph: rank 742,163, 27 hosts
- Verified with: Google
DNS records as swept Sep 2026, certificate as seen Sep 2026. How the web is hosted
Subdomains
| Host | Techs |
|---|---|
| www.speleo.cz | 7 |
| audy.speleo.cz | 2 |