What powers 
b4s.jp?
Last seen Aug 2026 · 22 technologies across 13 categories
Analytics
CMS
Databases
Font scripts
JavaScript Frameworks
JavaScript libraries
Miscellaneous
Performance
Programming languages
SEO
Tag managers
Web servers
WordPress plugins
AI Crawlers
Doesn't name any of the 33 AI crawlers we track in its robots.txt. Catch-all rules (User-agent: *) restrict some paths for every crawler, AI or not. Checked Sep 2026.
- robots.txt found
- llms.txt found
- ai.txt not found
Top backlinks
Top links pointing at the site, one per source domain, strongest first. The anchor text opens the page carrying the link.
AI Crawlers
No AI crawlers blocked
Standards: llms.txt
Audience
- 51% desktop
- 49% phone
Japan
Where the site's Chrome visitors come from, largest estimated audience first.
Open Page Rank
5.32 / 10 · ranked #188,863 of all domains
92 referring domains · OpenPageRank
Core Web Vitals
| LCP | 2.5 s |
| INP | 75 ms |
| CLS | 0 |
| TTFB | 1900 ms |
Real user p75, Chrome UX Report, Aug 2026.
Page
- Language: Japanese
- Weight: 10.3 MB · 144 requests
- Structured data: JSON-LD, OpenGraph, Twitter Cards
Homepage as crawled by the HTTP Archive, Sep 2026.
Organisation
- Bridge for Smile
- Founded: 2005
- Country: Japan
From the homepage's own structured data (Sep 2026) and Wikidata (CC0).
Infrastructure
- Hosted on GMO Internet (157.7.107.183)
- DNS: Muumuu Domain
- Email: Google Workspace
- Email security: SPF (soft fail), DMARC monitor only
- SSL: GlobalSign, RSA 2048, expires Jan 2027
- Common Crawl link graph: rank 1,145,029, 5 hosts
- Verified with: Google, Microsoft 365
DNS records as swept Sep 2026, certificate as seen Sep 2026. How the web is hosted
Subdomains
| Host | Techs |
|---|---|
| b4s.jp | 17 |
| www.b4s.jp | 16 |
| coyell.b4s.jp | 14 |
| sns.b4s.jp | 3 |
Full technology history →
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Recent changes
- detected Priority Hints Jan 2026