What powers sssi.cz?
Last seen Aug 2026 · 33 technologies across 16 categories
CDN
CMS
Databases
Font scripts
JavaScript frameworks
JavaScript libraries
Miscellaneous
Performance
Programming languages
Search engines
UI frameworks
Web frameworks
Web servers
Webmail
WordPress plugins
WordPress themes
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
Czechia
Where the site's Chrome visitors come from, largest estimated audience first.
Open Page Rank
1.97 / 10 · ranked #3,672,532 of all domains
9 referring domains · OpenPageRank
Core Web Vitals
| LCP | 2.9 s |
| INP | 175 ms |
| CLS | 0 |
| TTFB | 1700 ms |
Real user p75, Chrome UX Report, Aug 2026.
Page
- Language: Czech
- Weight: 4.1 MB · 88 requests
- WordPress theme: twentytwentyone · all themes
- Structured data: JSON-LD, OpenGraph, Twitter Cards
Homepage as crawled by the HTTP Archive, Sep 2026.
Organisation
- SŠSI - Střední škola spojů a informatiky
From the homepage's own structured data (Sep 2026).
Infrastructure
- Hosted on INTERNET-CZ Ktis 2, 384 03 Ktis (80.211.202.249)
- Email: no MX record returned, SPF names Microsoft 365
- Email security: SPF (hard fail), DNSSEC signed
- SSL: Let's Encrypt, RSA 2048, expires Nov 2026
- Common Crawl link graph: rank 12,914,990, 2 hosts
- Verified with: Google
DNS records as swept Sep 2026, certificate as seen Sep 2026. How the web is hosted
Subdomains
| Host | Techs |
|---|---|
| sssi.cz | 24 |
| www.sssi.cz | 13 |
Full technology history →
Report an incorrect detection
Recent changes
- detected Twitter Emoji (Twemoji) Dec 2025
- detected Microsoft 365 Oct 2025