What powers 
optimweb.cz?
Last seen Sep 2026 · 14 technologies across 9 categories
Analytics
Google Analytics
since Apr 2024
CDN
Cloudflare
since Apr 2024
Google Hosted Libraries
since Apr 2024
Font scripts
Google Font API
since Apr 2024
JavaScript libraries
Miscellaneous
HTTP/3
since Apr 2024
Open Graph
since Apr 2024
Programming languages
PHP
since Apr 2024
Security
HSTS
since Sep 2026
Tag managers
Google Tag Manager
since Apr 2024
Web frameworks
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 Nov 2026.
- robots.txt found
- llms.txt not found
- ai.txt not found
- Oct 2026 *: Restricted (was Allowed)
AI Crawlers
No AI crawlers blocked
Open Page Rank
3.55 / 10 · ranked #840,253 of all domains
19 referring domains · OpenPageRank
Infrastructure
- Hosted on Cloudflare (104.21.90.35, IPv6)
- DNS: Cloudflare DNS
- Email: jed.cz
- Email security: SPF (soft fail), DMARC quarantine, DNSSEC signed
- SSL: Google Trust Services, ECDSA P256, wildcard, expires Dec 2026
- Common Crawl link graph: rank 11,114,662, 3 hosts
- Verified with: Google
DNS records as swept Nov 2026, certificate as seen Nov 2026. How the web is hosted
Full technology history →
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Recent changes
- detected HSTS Sep 2026