What powers 
cr-sei.cz?
Last seen Jun 2024 · 14 technologies across 10 categories
CMS
Databases
MySQL
since Mar 2020
Font scripts
Font Awesome
since Mar 2020
Google Font API
since Mar 2020
JavaScript libraries
Miscellaneous
Open Graph
since Sep 2022
RSS
since Dec 2022
Performance
Priority Hints
since Aug 2023
Programming languages
PHP
since Mar 2020
UI frameworks
Bootstrap
since Mar 2020
Web servers
Nginx
since Mar 2020
Webmail
Microsoft 365
since Aug 2022
AI Crawlers
No robots.txt, so all AI crawlers are allowed by default. Checked Sep 2026.
- robots.txt not found
- llms.txt not found
- ai.txt not found
AI Crawlers
No robots.txt, all AI crawlers allowed
Open Page Rank
5.45 / 10 · ranked #165,451 of all domains
137 referring domains · OpenPageRank
Infrastructure
- Hosted on Websupport (37.9.175.164, IPv6)
- DNS: ignum.com
- Email: Microsoft 365
- Email security: SPF (hard fail), DMARC quarantine, DNSSEC signed
- SSL: Let's Encrypt, RSA 4096, expires Nov 2026
- Common Crawl link graph: rank 14,213,875, 2 hosts
- Verified with: Microsoft 365
DNS records as swept Sep 2026, certificate as seen Sep 2026. How the web is hosted