What powers black-jack-21.com?
Last seen May 2026 · 20 technologies across 12 categories
Analytics
Cloudflare Browser Insights
since Dec 2025
Google Analytics
since Dec 2022
CDN
Cloudflare
since Dec 2025
CMS
Databases
MySQL
since Oct 2022
JavaScript libraries
jQuery Migrate
since Oct 2022
Swiper
since Oct 2022
Miscellaneous
Page builders
Performance
LazySizes
since Oct 2022
Programming languages
PHP
since Oct 2022
Security
HSTS
since Sep 2024
Tag managers
Google Tag Manager
since Jul 2025
WordPress plugins
Autoptimize
since Oct 2022
RankMath SEO
since Nov 2022
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 checked
- ai.txt not checked
AI Crawlers
No AI crawlers blocked
Open Page Rank
2.33 / 10 · ranked #2,822,398 of all domains
36 referring domains · OpenPageRank
Infrastructure
- Hosted on Cloudflare (104.21.28.183, IPv6)
- DNS: Cloudflare DNS
- Email: best-hosting.cz
- Email security: SPF (hard fail), no DMARC record
- SSL: Google Trust Services, ECDSA P256, wildcard, expires Oct 2026
- Common Crawl link graph: rank 11,408,659, 2 hosts
- Verified with: Google
DNS records as swept Sep 2026, certificate as seen Sep 2026. How the web is hosted
Full technology history →
Report an incorrect detection
Recent changes
- dropped Priority Hints May 2026
- dropped Font Awesome Apr 2026
- dropped Apache HTTP Server Jan 2026
- dropped Ubuntu Jan 2026
- detected Cloudflare Dec 2025
- detected Cloudflare Browser Insights Dec 2025
- detected HTTP/3 Dec 2025