What powers 221b.jp?
Last seen Jun 2026 · 17 technologies across 12 categories
Advertising
Google AdSense
since Aug 2018
Twitter Ads
since Jul 2021
Analytics
Google Analytics
since Aug 2018
CDN
Cloudflare
since Mar 2025
jQuery CDN
since Feb 2022
Cookie compliance
Funding Choices
since Jul 2024
Font scripts
Google Font API
since Nov 2025
JavaScript libraries
Miscellaneous
HTTP/3
since Feb 2026
Mobile frameworks
Security
Cloudflare Bot Management
since Mar 2025
reCAPTCHA
since Apr 2022
Tag managers
Google Tag Manager
since Jul 2021
Web servers
Widgets
Twitter
since Aug 2018
Audience
- 72% phone
- 28% desktop
Japan
Countries where the site has Chrome traffic, strongest markets first.
Open Page Rank
3.00 / 10 · ranked #1,596,374 of all domains
24 referring domains · OpenPageRank
Core Web Vitals
| LCP | 0.4 s |
| INP | 25 ms |
| CLS | 0 |
| TTFB | 100 ms |
Real user p75, Chrome UX Report, Jun 2026.
Page
- Weight: 0.9 MB · 66 requests
- Structured data: Twitter Cards
Homepage as crawled by the HTTP Archive, Jul 2026.
Subdomains
| Host | Techs |
|---|---|
| 221b.jp | 17 |
| www.221b.jp | 14 |
Full technology history →
Report an incorrect detection
Recent changes
- detected Google Tag Manager Jun 2026
- detected Nginx Jun 2026
- detected OpenResty Jun 2026
- detected Cloudflare May 2026
- detected Cloudflare Bot Management May 2026
- dropped Google Tag Manager May 2026
- dropped HSTS Mar 2026
- dropped Nginx Mar 2026
- dropped Ubuntu Mar 2026
- detected HTTP/3 Feb 2026
- detected LiteSpeed Feb 2026
- dropped Cloudflare Nov 2025
- dropped Cloudflare Bot Management Nov 2025
- detected Google Font API Nov 2025
- dropped Google Tag Manager Oct 2025