What powers r401.net?
Last seen Jun 2026 · 23 technologies across 14 categories
Advertising
i-mobile
since Feb 2022
Twitter Ads
since Jul 2021
Analytics
Google Analytics
since Aug 2018
CDN
Cloudflare
since Mar 2025
Font scripts
Glyphicons
since Aug 2018
Google Font API
since Mar 2020
Hosting
Sakura Internet
since Aug 2022
JavaScript frameworks
JavaScript libraries
Miscellaneous
Open Graph
since Sep 2022
RSS
since Dec 2022
Performance
Turbo
since Jun 2022
Programming languages
Security
Cloudflare Bot Management
since Mar 2025
HSTS
since Jun 2024
UI frameworks
Element UI
since Jun 2024
Web frameworks
Ruby on Rails
since Mar 2020
Widgets
Twitter
since Aug 2018
Audience
- 60% desktop
- 35% phone
- 5% tablet
Japan
South Korea
Taiwan
Countries where the site has Chrome traffic, strongest markets first.
Open Page Rank
1.86 / 10 · ranked #4,008,887 of all domains
14 referring domains · OpenPageRank
Core Web Vitals
| LCP | 0.4 s |
| INP | 50 ms |
| CLS | 0 |
| TTFB | 100 ms |
Real user p75, Chrome UX Report, Jun 2026.
Page
- Language: Japanese
- Weight: 1.2 MB · 43 requests
- Structured data: Microdata, OpenGraph, Twitter Cards
Homepage as crawled by the HTTP Archive, Jul 2026.
Subdomains
| Host | Techs |
|---|---|
| ss2ch.r401.net | 10 |
| yomuaa.r401.net | 9 |
| rss.r401.net | 8 |
| manga.r401.net | 6 |
| makimaru.r401.net | 4 |
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