What powers grcm.cz?
Last seen Aug 2026 · 19 technologies across 12 categories
Analytics
CDN
cdnjs
since Jul 2024
Cloudflare
since Jul 2024
Font scripts
Google Font API
since Jan 2019
JavaScript libraries
jQuery Migrate
since Sep 2024
Modernizr
since Jan 2019
Miscellaneous
Open Graph
since Sep 2022
Webpack
since Jan 2019
Operating systems
Debian
since Sep 2024
Programming languages
PHP
since Sep 2024
Security
HSTS
since Sep 2022
Tag managers
Google Tag Manager
since Sep 2024
UI frameworks
Web frameworks
Nette Framework
since Sep 2024
Web servers
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
- 64% phone
- 36% desktop
Czechia
Where the site's Chrome visitors come from, largest estimated audience first.
Open Page Rank
3.34 / 10 · ranked #1,080,917 of all domains
31 referring domains · OpenPageRank
Core Web Vitals
| LCP | 0.7 s |
| INP | 75 ms |
| CLS | 0 |
| TTFB | 200 ms |
Real user p75, Chrome UX Report, Aug 2026.
Page
- Language: Czech
- Weight: 0.9 MB · 37 requests
- Structured data: JSON-LD, Microdata, OpenGraph
Homepage as crawled by the HTTP Archive, Sep 2026.
Organisation
From the homepage's own structured data (Sep 2026).
Infrastructure
- Hosted on INTERNET-CZ Ktis 2, 384 03 Ktis (193.105.158.197)
- Email: no MX record returned, SPF names Websupport
- Email security: SPF (neutral), DMARC monitor only, DNSSEC signed
- Common Crawl link graph: rank 3,438,075, 5 hosts
DNS records as swept Sep 2026. How the web is hosted
Subdomains
| Host | Techs |
|---|---|
| rezervace.grcm.cz | 13 |
| www.grcm.cz | 12 |
Full technology history →
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Recent changes
- detected PostHog Feb 2026