What powers sip21c.org?
Last seen Jun 2026 · 2 technologies across 2 categories
Security
HSTS
since Sep 2022
Web servers
Apache HTTP Server
since Aug 2018
Audience
- 61% phone
- 39% desktop
Japan
Countries where the site has Chrome traffic, strongest markets first.
Open Page Rank
3.76 / 10 · ranked #733,617 of all domains
56 referring domains · OpenPageRank
Core Web Vitals
| LCP | 0.6 s |
| CLS | 0 |
| TTFB | 300 ms |
Real user p75, Chrome UX Report, Jun 2026.
Page
- Language: Japanese
- Weight: 0.1 MB · 6 requests
Homepage as crawled by the HTTP Archive, Jul 2026.