What powers sstrnb.cz?
Last seen Sep 2026 · 26 technologies across 14 categories
CDN
cdnjs
since Dec 2024
Cloudflare
since Dec 2024
jQuery CDN
since Dec 2024
jsDelivr
since Dec 2024
Unpkg
since Dec 2024
Editors
Microsoft Word
since Jun 2020
Font scripts
Google Font API
since Feb 2024
Typekit
since Dec 2024
JavaScript frameworks
JavaScript libraries
LMS
Moodle
since Jun 2020
Miscellaneous
Operating systems
Ubuntu
since Jun 2020
Programming languages
PHP
since Jun 2020
Security
reCAPTCHA
since Dec 2024
Tag managers
Google Tag Manager
since Dec 2024
Web frameworks
Web servers
Apache HTTP Server
since Jun 2020
Nginx
since Dec 2024
Webmail
Microsoft 365
since Feb 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
- 82% phone
- 18% desktop
Czechia
Where the site's Chrome visitors come from, largest estimated audience first.
Open Page Rank
2.53 / 10 · ranked #2,445,839 of all domains
14 referring domains · OpenPageRank
Core Web Vitals
| LCP | 1.1 s |
| INP | 100 ms |
| CLS | 0 |
| TTFB | 300 ms |
Real user p75, Chrome UX Report, Aug 2026.
Page
- Language: Czech
- Weight: 2.0 MB · 70 requests
- Structured data: OpenGraph, Twitter Cards
Homepage as crawled by the HTTP Archive, Sep 2026.
Infrastructure
- Hosted on ACTIVE24-AS www.active24.cz (81.95.99.217, IPv6)
- Email: no MX record returned, SPF names Microsoft 365
- Email security: SPF (soft fail), DNSSEC signed
- SSL: Let's Encrypt, ECDSA P256, expires Nov 2026
- Common Crawl link graph: rank 12,826,403, 2 hosts
- Verified with: Microsoft 365
DNS records as swept Sep 2026, certificate as seen Sep 2026. How the web is hosted
Subdomains
| Host | Techs |
|---|---|
| www.sstrnb.cz | 20 |
| vyuka.sstrnb.cz | 8 |
Full technology history →
Report an incorrect detection
Recent changes
- detected HTTP/3 Sep 2026
- dropped Cloudflare Bot Management Nov 2025