What powers cas.cz?
Last seen Aug 2026 · 246 technologies across 42 categories
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AI Crawlers
No robots.txt, so all AI crawlers are allowed by default. Checked Sep 2026.
- robots.txt not found
- llms.txt not found
- ai.txt not found
- Sep 2026 * removed from robots.txt
- Sep 2026 robots.txt removed
- Aug 2026 *: Blocked (was Restricted)
- Aug 2026 *: Restricted (was Blocked)
AI Crawlers
No robots.txt, all AI crawlers allowed
Audience
- 59% desktop
- 41% phone
Czechia
United States
Germany
Vietnam
Ukraine
Austria
Where the site's Chrome visitors come from, largest estimated audience first.
Open Page Rank
8.33 / 10 · ranked #3,672 of all domains
4,620 referring domains · OpenPageRank
Core Web Vitals
| LCP | 0.5 s |
| INP | 50 ms |
| CLS | 0 |
| TTFB | 200 ms |
Real user p75, Chrome UX Report, Aug 2026.
Page
- Language: Czech
- Weight: 2.0 MB · 75 requests
Homepage as crawled by the HTTP Archive, Sep 2026.
Similar sites
Closest technology stacks among the highest-authority sites we track; "shared" counts the distinctive technologies in common.
Organisation
- Fyziologický ústav AV ČR (Ondřejov Observatory on Wikidata)
- Founded: 1898
- Country: Czech Republic
From the homepage's own structured data (Sep 2026) and Wikidata (CC0).
Infrastructure
- Registered Oct 1996 (29 years), renews Oct 2034
- Hosted on CESNET2 (147.231.163.240)
- Email: Microsoft 365
- Email security: no SPF record, no DMARC record, DNSSEC signed
- SSL: HARICA, RSA 2048, expires Oct 2026
- Common Crawl link graph: rank 5,976, 1,176 hosts
DNS records as swept Sep 2026, certificate as seen Sep 2026, registration from the registry's RDAP service. How the web is hosted
Subdomains
| Host | Techs |
|---|---|
| lib.cas.cz | 36 |
| www.iem.cas.cz | 27 |
| clb.ucl.cas.cz | 25 |
| www.ig.cas.cz | 23 |
| www.ih.cas.cz | 23 |
| pm.ueb.cas.cz | 22 |
| ucl.cas.cz | 22 |
| ujc.cas.cz | 22 |
| langdpt.cas.cz | 21 |
| www.iic.cas.cz | 21 |
| techtransfer.cas.cz | 20 |
| www.ufa.cas.cz | 20 |
| cms.flu.cas.cz | 19 |
| lhr.ueb.cas.cz | 19 |
| mbu.cas.cz | 19 |
| www.img.cas.cz | 19 |
| data.ucl.cas.cz | 18 |
| labgis.ibot.cas.cz | 18 |
| www.pametnimista.usd.cas.cz | 18 |
| www.ucl.cas.cz | 18 |
| applebreeding.ueb.cas.cz | 17 |
| openscience.lib.cas.cz | 17 |
| www.it.cas.cz | 17 |
| aror.orient.cas.cz | 16 |
Full technology history →
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Recent changes
- dropped Knockout.js Aug 2026
- dropped Polyfill Jul 2026
- dropped Preact Jul 2026
- dropped WPForms Jul 2026
- detected Bootstrap Icons May 2026
- dropped Express May 2026
- detected Apple iCloud Mail Apr 2026
- detected All in One SEO Feb 2026
- dropped Slider Revolution Feb 2026
- detected Astra Jan 2026
- dropped Glider.js Jan 2026
- dropped Microsoft Advertising Jan 2026
- dropped Plyr Jan 2026
- detected Redis Jan 2026
- detected Redis Object Cache Jan 2026
- dropped Vimeo Jan 2026
- dropped JavaServer Faces Nov 2025
- detected Glider.js Oct 2025
- detected Plyr Oct 2025
- detected Vimeo Oct 2025