What powers herz.cz?
Last seen Oct 2026 · 18 technologies across 11 categories
Analytics
CDN
Font scripts
JavaScript libraries
Miscellaneous
Programming languages
Security
Tag managers
UI frameworks
Web servers
Webmail
AI Crawlers
Blocks 8 of 33 AI crawlers we track by name in its robots.txt. Checked Oct 2026.
Training crawlers
- Applebot-Extended Blocked
- Bytespider Blocked
- CCBot Blocked
- ClaudeBot Blocked
- Google-Extended Blocked
- GPTBot Blocked
- meta-externalagent Blocked
Search and AI assistants
- Amazonbot Blocked
The other 25 AI crawlers we track are not mentioned and only inherit the catch-all rules that apply to every crawler.
- robots.txt found
- llms.txt found
- ai.txt not found
Content Signals:
search=yes ai-train=no declared in robots.txt
- Sep 2026 applebot-extended added to robots.txt
- Sep 2026 bytespider added to robots.txt
- Sep 2026 amazonbot added to robots.txt
- Sep 2026 meta-externalagent added to robots.txt
- Sep 2026 robots.txt appeared
- Sep 2026 * added to robots.txt
AI Crawlers
8 of 33 AI crawlers blocked
Standards: llms.txt, Content Signals
Audience
- 53% desktop
- 47% phone
Czechia
Where the site's Chrome visitors come from, largest estimated audience first.
Open Page Rank
3.14 / 10 · ranked #1,362,477 of all domains
22 referring domains · OpenPageRank
Core Web Vitals
| LCP | 1.6 s |
| INP | 75 ms |
| CLS | 0 |
| TTFB | 1200 ms |
Real user p75, Chrome UX Report, Sep 2026.
Page
- Language: Czech
- Weight: 12.1 MB · 85 requests
- Structured data: OpenGraph, Twitter Cards
Homepage as crawled by the HTTP Archive, Oct 2026.
Infrastructure
- Hosted on MASTER-AS Czech Republic www.master.cz (176.227.168.132)
- DNS: web4u.cz
- Email: Microsoft 365
- Email security: SPF (hard fail), no DMARC record, DNSSEC signed
- SSL: Let's Encrypt, RSA 4096, expires Dec 2026
- Common Crawl link graph: rank 17,897,643, 3 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
- dropped DataTables Oct 2026