What powers 
jacz.cz?
Last seen Sep 2026 · 18 technologies across 12 categories
Analytics
Google Analytics
since Apr 2019
CDN
CMS
Joomla
since Apr 2019
Font scripts
Google Font API
since Dec 2020
JavaScript frameworks
JavaScript libraries
Miscellaneous
RSS
since Dec 2022
Programming languages
Security
HSTS
since Aug 2025
Tag managers
Google Tag Manager
since Dec 2020
UI frameworks
Web servers
AI Crawlers
No robots.txt, so all AI crawlers are allowed by default. Checked Oct 2026.
- robots.txt not found
- llms.txt not found
- ai.txt not found
AI Crawlers
No robots.txt, all AI crawlers allowed
Audience
- 63% phone
- 37% desktop
Czechia
Where the site's Chrome visitors come from, largest estimated audience first.
Open Page Rank
3.96 / 10 · ranked #598,197 of all domains
27 referring domains · OpenPageRank
Core Web Vitals
| LCP | 3.6 s |
| CLS | 0 |
| TTFB | 3300 ms |
Real user p75, Chrome UX Report, Aug 2026.
Page
- Weight: 1.4 MB · 33 requests
Homepage as crawled by the HTTP Archive, Sep 2026.
Infrastructure
- Hosted on TMOBILE- (46.13.15.200, IPv6)
- DNS: Cloudflare DNS
- Email: jacz.cz
- Email security: SPF (hard fail), DMARC quarantine, DNSSEC signed
- SSL: Let's Encrypt, ECDSA P384, wildcard, expires Dec 2026
- Common Crawl link graph: rank 3,033,077, 10 hosts
DNS records as swept Oct 2026, certificate as seen Oct 2026. How the web is hosted
Subdomains
| Host | Techs |
|---|---|
| asja.jacz.cz | 16 |
| www.jacz.cz | 13 |