What powers s4e.jp?
Last seen Oct 2026 · 16 technologies across 14 categories
Affiliate programs
Amazon Associates
since Feb 2025
Analytics
Google Analytics
since Mar 2019
Font scripts
Google Font API
since Apr 2025
JavaScript frameworks
JavaScript graphics
JavaScript libraries
Miscellaneous
Open Graph
since Sep 2022
Operating systems
Ubuntu
since Jan 2024
Programming languages
PHP
since Jan 2019
Security
HSTS
since Jan 2024
UI frameworks
Video players
YouTube
since Apr 2025
Web frameworks
CakePHP
since Aug 2021
Web servers
Nginx
since Sep 2025
AI Crawlers
Blocks all crawlers by default in robots.txt (User-agent: *). Checked Nov 2026.
- robots.txt found
- llms.txt not found
- ai.txt not found
- Nov 2026 * added to robots.txt
- Nov 2026 chatgpt-user removed from robots.txt
- Nov 2026 claudebot removed from robots.txt
- Nov 2026 gptbot removed from robots.txt
- Nov 2026 oai-searchbot removed from robots.txt
AI Crawlers
All crawlers blocked
Audience
- 95% desktop
- 5% phone
Japan
Where the site's Chrome visitors come from, largest estimated audience first.
Open Page Rank
3.36 / 10 · ranked #1,054,044 of all domains
20 referring domains · OpenPageRank
Core Web Vitals
| LCP | 0.4 s |
| INP | 25 ms |
| CLS | 0 |
| TTFB | 300 ms |
Real user p75, Chrome UX Report, Sep 2026.
Page
- Language: Japanese
- Weight: 0.5 MB · 8 requests
Homepage as crawled by the HTTP Archive, Oct 2026.
Infrastructure
- Hosted on Sakura Internet (153.127.198.66)
- Email: Sakura Internet
- Email security: SPF (soft fail), DMARC monitor only
- SSL: JPRS, RSA 2048, wildcard, expires Feb 2027
- Common Crawl link graph: rank 11,447,023, 4 hosts
DNS records as swept Nov 2026, certificate as seen Nov 2026. How the web is hosted
Subdomains
| Host | Techs |
|---|---|
| rst-web.s4e.jp | 14 |
| www.s4e.jp | 11 |
| rst-cbt.s4e.jp | 4 |