What powers sumcak.cz?
Last seen Oct 2026 · 20 technologies across 14 categories
Analytics
CMS
Databases
Font scripts
JavaScript frameworks
JavaScript libraries
Miscellaneous
Mobile frameworks
Page builders
Performance
Programming languages
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 Oct 2026.
- robots.txt found
- llms.txt not found
- ai.txt not found
AI Crawlers
No AI crawlers blocked
Audience
- 93% phone
- 7% tablet
Czechia
Where the site's Chrome visitors come from, largest estimated audience first.
Open Page Rank
1.88 / 10 · ranked #3,932,706 of all domains
7 referring domains · OpenPageRank
Core Web Vitals
| LCP | 2 s |
| INP | 125 ms |
| CLS | 0.35 |
| TTFB | 1300 ms |
Real user p75, Chrome UX Report, Sep 2026.
Page
- Language: Czech (Czechia)
- Weight: 10.5 MB · 77 requests
- WordPress theme: divi (child: sumcak) · all themes
Homepage as crawled by the HTTP Archive, Oct 2026.
Infrastructure
- Hosted on IGNUM-AS Czech Republic (62.109.150.217, IPv6)
- DNS: onebit.cz
- Email: onebit.cz
- Email security: no SPF record, DMARC monitor only, DNSSEC signed
- SSL: Let's Encrypt, RSA 2048, expires Dec 2026
- Common Crawl link graph: rank 15,238,267, 2 hosts
DNS records as swept Oct 2026, certificate as seen Oct 2026. How the web is hosted
Full technology history →
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Recent changes
- detected HTTP/3 Apr 2026