What powers 
osek.cz?
Last seen Aug 2026 · 29 technologies across 19 categories
Analytics
Google Analytics
since Jun 2020
CDN
cdnjs
since Jun 2023
Cloudflare
since Jun 2023
CMS
Drupal
since Sep 2020
Comment systems
CRM
Salesforce
since Aug 2022
MailChimp
since Aug 2022
Font scripts
Google Font API
since Apr 2021
JavaScript frameworks
JavaScript libraries
Maps
Miscellaneous
Operating systems
Windows Server
since Jan 2019
Programming languages
PHP
since Sep 2020
TypeScript
since Mar 2026
Security
Social logins
Google Sign-in
since Apr 2021
UI frameworks
Web servers
Apache HTTP Server
since Sep 2020
Webmail
Microsoft 365
since Aug 2022
Widgets
Google Plus
since Sep 2020
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 Sep 2026.
- robots.txt found
- llms.txt not found
- ai.txt not found
AI Crawlers
No AI crawlers blocked
Audience
- 85% phone
- 15% desktop
Czechia
Where the site's Chrome visitors come from, largest estimated audience first.
Open Page Rank
3.81 / 10 · ranked #712,238 of all domains
48 referring domains · OpenPageRank
Core Web Vitals
| LCP | 2.2 s |
| INP | 75 ms |
| CLS | 0 |
| TTFB | 900 ms |
Real user p75, Chrome UX Report, Aug 2026.
Page
- Language: Czech
- Weight: 3.0 MB · 89 requests
- Structured data: OpenGraph
Homepage as crawled by the HTTP Archive, Sep 2026.
Organisation
- Osek
- Country: Czech Republic
From Wikidata (CC0).
Infrastructure
- Hosted on SUPERNETWORK _ (88.86.103.135, IPv6)
- DNS: forpsi.cz
- Email: Microsoft 365
- Email security: SPF, no DMARC record, DNSSEC signed
- SSL: Let's Encrypt, RSA 2048, expires Oct 2026
- Common Crawl link graph: rank 1,281,621, 5 hosts
- Verified with: Microsoft 365
DNS records as swept Sep 2026, certificate as seen Sep 2026. How the web is hosted
Subdomains
| Host | Techs |
|---|---|
| osek.cz | 18 |
| www.osek.cz | 17 |
| portal.osek.cz | 9 |
| historie.osek.cz | 7 |