What powers vanleeuwen.cz?
Last seen Sep 2026 · 18 technologies across 12 categories
Advertising
Adform
since May 2025
Analytics
Google Analytics
since Sep 2024
Linkedin Insight Tag
since Sep 2024
CDN
CMS
Kentico CMS
since Sep 2024
JavaScript libraries
Miscellaneous
Open Graph
since Sep 2024
Operating systems
Windows Server
since Sep 2024
Security
Cloudflare Bot Management
since Oct 2024
Tag managers
Google Tag Manager
since Sep 2024
Web frameworks
Web servers
Webmail
Microsoft 365
since Sep 2024
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 found
- ai.txt not found
AI Crawlers
No AI crawlers blocked
Audience
Czechia
Where the site's Chrome visitors come from, largest estimated audience first.
Open Page Rank
0.74 / 10 · ranked #18,251,772 of all domains
1 referring domains · OpenPageRank
Core Web Vitals
| LCP | 1 s |
| INP | 100 ms |
| CLS | 0 |
| TTFB | 400 ms |
Real user p75, Chrome UX Report, Sep 2026.
Page
- Weight: 7.6 MB · 92 requests
- Structured data: OpenGraph
Homepage as crawled by the HTTP Archive, Oct 2026.
Infrastructure
- Hosted on MASTER-AS Czech Republic www.master.cz (77.93.192.91)
- Email: no MX record returned, SPF names Microsoft 365
- Email security: SPF (hard fail), DMARC reject, DNSSEC signed
- SSL: Sectigo, RSA 2048, expires Dec 2026
- Common Crawl link graph: rank 37,621,092, 2 hosts
- Verified with: Google, KnowBe4, Microsoft 365
DNS records as swept Aug 2026, certificate as seen Sep 2026. How the web is hosted