What powers gtr.cz?
Last seen Sep 2026 · 31 technologies across 16 categories
Analytics
Caching
CDN
CMS
Databases
Font scripts
JavaScript libraries
Maps
Miscellaneous
Performance
Programming languages
Tag managers
UI frameworks
Video players
Web servers
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 Sep 2026.
- robots.txt found
- llms.txt found
- ai.txt not found
AI Crawlers
No AI crawlers blocked
Standards: llms.txt
Audience
- 77% phone
- 23% desktop
Czechia
Where the site's Chrome visitors come from, largest estimated audience first.
Open Page Rank
2.88 / 10 · ranked #1,814,587 of all domains
16 referring domains · OpenPageRank
Core Web Vitals
| LCP | 1 s |
| INP | 100 ms |
| CLS | 0 |
Real user p75, Chrome UX Report, Aug 2026.
Page
- Language: Czech
- Weight: 22.4 MB · 71 requests
- WordPress theme: gtrcz · all themes
- Structured data: JSON-LD, OpenGraph, Twitter Cards
Homepage as crawled by the HTTP Archive, Sep 2026.
Organisation
- GTR.cz - Gymnázium Třebíč (Gymnázium Třebíč on Wikidata)
- Founded: 1871
- Country: Czech Republic
- Profiles: Facebook, X, Instagram, YouTube
From the homepage's own structured data (Sep 2026) and Wikidata (CC0).
Infrastructure
- Hosted on CASABLANCA-AS Internet & Collocation Provider (217.11.249.147, IPv6)
- DNS: web4u.cz
- Email: no MX record returned, SPF names Microsoft 365
- Email security: SPF (hard fail), DNSSEC signed
- SSL: Let's Encrypt, ECDSA P256, expires Nov 2026
- Common Crawl link graph: rank 13,140,150, 3 hosts
- Verified with: Google, Microsoft 365
DNS records as swept Sep 2026, certificate as seen Sep 2026. How the web is hosted
Subdomains
| Host | Techs |
|---|---|
| studuj.gtr.cz | 23 |
| www.gtr.cz | 18 |
| 150.gtr.cz | 15 |
| gtr.cz | 14 |