What powers rfc.jp?
Last seen Jun 2026 · 14 technologies across 11 categories
Advertising
Twitter Ads
since Jul 2021
Analytics
CDN
Cloudflare
since Mar 2025
Google Hosted Libraries
since Feb 2022
Font scripts
JavaScript libraries
Miscellaneous
Open Graph
since Sep 2022
Programming languages
Security
Cloudflare Bot Management
since Mar 2025
HSTS
since Sep 2022
Video players
YouTube
since Jan 2019
Web servers
Apache HTTP Server
since Jan 2019
Widgets
Twitter
since Jan 2019
Top backlinks
Top links pointing at the site, one per source domain, strongest first. The anchor text opens the page carrying the link.
Audience
- 80% phone
- 18% desktop
- 1% tablet
Japan
Countries where the site has Chrome traffic, strongest markets first.
Open Page Rank
5.29 / 10 · ranked #210,532 of all domains
124 referring domains · OpenPageRank
Core Web Vitals
| LCP | 1.1 s |
| INP | 175 ms |
| CLS | 0 |
| TTFB | 400 ms |
Real user p75, Chrome UX Report, Jun 2026.
Page
- Language: Japanese
- Weight: 19.0 MB · 119 requests
- Structured data: OpenGraph
Homepage as crawled by the HTTP Archive, Jul 2026.
Subdomains
| Host | Techs |
|---|---|
| www.rfc.jp | 10 |
| rfc.jp | 9 |
| www1.rfc.jp | 8 |
Full technology history →
Report an incorrect detection
Recent changes
- detected Cloudflare May 2026
- detected Cloudflare Bot Management May 2026
- dropped Cloudflare Nov 2025
- dropped Cloudflare Bot Management Nov 2025