What powers ders.cz?
Last seen Apr 2026 · 15 technologies across 10 categories
CDN
jsDelivr
since Mar 2024
JavaScript libraries
Operating systems
AlmaLinux
since Aug 2025
Programming languages
Java
since Mar 2023
Rich text editors
Monaco Editor
since Mar 2026
Security
HSTS
since Mar 2023
UI frameworks
Web server extensions
mod_fastcgi
since Aug 2025
Web servers
Nginx
since Mar 2023
Webmail
Google Workspace
since Mar 2023
AI Crawlers
Blocks all crawlers by default in robots.txt (User-agent: *). Checked Sep 2026.
- robots.txt found
- llms.txt not checked
- ai.txt not checked
AI Crawlers
All crawlers blocked
Audience
Czechia
Where the site's Chrome visitors come from, largest estimated audience first.
Open Page Rank
3.13 / 10 · ranked #1,370,962 of all domains
11 referring domains · OpenPageRank
Core Web Vitals
| LCP | 0.3 s |
| INP | 25 ms |
| CLS | 0 |
| TTFB | 100 ms |
Real user p75, Chrome UX Report, Aug 2026.
Organisation
- Ders (Czechia)
- Founded: 1999
- Country: Czech Republic
From Wikidata (CC0).
Infrastructure
- Hosted on O2-CZECH-REPUBLIC (90.176.150.92)
- DNS: regzone.cz
- Email: no MX record returned
- Email security: DNSSEC signed, CAA
- SSL: Let's Encrypt, RSA 2048, wildcard, expires Nov 2026
- Common Crawl link graph: rank 2,974,424, 12 hosts
DNS records as swept Sep 2026, certificate as seen Sep 2026. How the web is hosted
Subdomains
| Host | Techs |
|---|---|
| kissos-lbc.ders.cz | 10 |
| sitkhk.ders.cz | 7 |
| signer.ders.cz | 5 |
| jira.ders.cz | 4 |
| sso.ders.cz | 4 |
| wiki.ders.cz | 4 |