What powers carbrain4.jp?
Last seen Sep 2026 · 15 technologies across 12 categories
Hosting
Xserver
since Oct 2024
JavaScript frameworks
Stimulus
since Oct 2024
JavaScript graphics
JavaScript libraries
Miscellaneous
Webpack
since Oct 2024
Operating systems
Ubuntu
since Oct 2024
Performance
Turbolinks
since Oct 2024
Programming languages
Ruby
since Oct 2024
Security
HSTS
since Oct 2024
UI frameworks
CoreUI
since Oct 2024
Web frameworks
Ruby on Rails
since Oct 2024
Web servers
AI Crawlers
Blocks all crawlers by default in robots.txt (User-agent: *). Checked Oct 2026.
- robots.txt found
- llms.txt not checked
- ai.txt not checked
AI Crawlers
All crawlers blocked
Audience
- 100% desktop
Japan
Where the site's Chrome visitors come from, largest estimated audience first.
Core Web Vitals
| LCP | 2.4 s |
| CLS | 0 |
| TTFB | 2000 ms |
Real user p75, Chrome UX Report, Sep 2026.
Infrastructure
- Hosted on Amazon Web Services (54.64.165.35)
- Email: carbrain4.jp
- Email security: SPF (soft fail), no DMARC record
- SSL: Amazon Trust Services, RSA 2048, expires Jan 2027
DNS records as swept Oct 2026, certificate as seen Oct 2026. How the web is hosted