What powers virtualis.cz?
Last seen Aug 2026 · 14 technologies across 10 categories
Analytics
Google Analytics
since Jan 2023
Font scripts
Font Awesome
since Jan 2023
JavaScript libraries
Miscellaneous
PWA
since Jan 2023
Operating systems
Debian
since Jan 2023
Performance
Priority Hints
since Feb 2026
Programming languages
PHP
since Jan 2023
Tag managers
Google Tag Manager
since Nov 2023
UI frameworks
Web servers
AI Crawlers
Doesn't mention any of the 33 AI crawlers we track in its robots.txt; all are allowed by default. Checked Sep 2026.
- robots.txt found
- llms.txt not checked
- ai.txt not checked
Top backlinks
Top links pointing at the site, one per source domain, strongest first. The anchor text opens the page carrying the link.
AI Crawlers
No AI crawlers blocked
Open Page Rank
5.30 / 10 · ranked #198,041 of all domains
48 referring domains · OpenPageRank
Infrastructure
- Hosted on WEB4U (81.91.84.215)
- DNS: web4u.cz
- Email: virtualis.cz
- Email security: SPF (soft fail), no DMARC record
- SSL: Let's Encrypt, RSA 2048, expires Oct 2026
- Common Crawl link graph: rank 16,695,022, 4 hosts
- Verified with: Google
DNS records as swept Sep 2026, certificate as seen Sep 2026. How the web is hosted
Full technology history →
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Recent changes
- dropped Google Font API Mar 2026
- dropped reCAPTCHA Mar 2026