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

Livefyre v1.9.4
since Apr 2025

CRM

Salesforce
since Aug 2022

Email

MailChimp
since Aug 2022

Font scripts

Google Font API
since Apr 2021

JavaScript frameworks

Angular v19.2.18
since Mar 2026
Zone.js
since Mar 2026

JavaScript libraries

jQuery v3.3.1
since Sep 2020
jQuery Migrate v1.4.1
since Jun 2023
Lightbox
since Sep 2020
Swiper
since Jun 2023

Maps

Leaflet v1.9.4
since Apr 2025

Miscellaneous

Open Graph
since Jun 2023
Popper v1.16.0
since Jun 2023
PWA
since Jun 2023

Operating systems

Windows Server
since Jan 2019

Programming languages

PHP
since Sep 2020
TypeScript
since Mar 2026

Security

HSTS
since Mar 2026
reCAPTCHA
since Jan 2019

Social logins

Google Sign-in
since Apr 2021

UI frameworks

Bootstrap v4.4.1
since Jun 2023

Web servers

Apache HTTP Server
since Sep 2020
IIS v10.0
since Jan 2019

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

See who blocks each AI crawler across the web

AI Crawlers

No AI crawlers blocked

Full breakdown

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

LCP2.2 s
INP75 ms
CLS0
TTFB900 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

HostTechs
osek.cz 18
www.osek.cz 17
portal.osek.cz 9
historie.osek.cz 7

Full technology history →
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