What powers 
castlebell.jp?
Last seen Sep 2026 · 18 technologies across 13 categories
Advertising
Analytics
Authentication
CDN
CMS
Databases
Hosting
JavaScript libraries
Maps
Miscellaneous
Programming languages
Tag managers
Web servers
AI Crawlers
Restricts 1 of 33 AI crawlers we track by name in its robots.txt. Checked Oct 2026.
Training crawlers
- GPTBot Restricted
The other 32 AI crawlers we track are not mentioned and only inherit the catch-all rules that apply to every crawler.
- robots.txt found
- llms.txt not checked
- ai.txt not checked
AI Crawlers
1 of 33 AI crawlers restricted
Audience
- 100% phone
Japan
Where the site's Chrome visitors come from, largest estimated audience first.
Open Page Rank
3.72 / 10 · ranked #755,083 of all domains
38 referring domains · OpenPageRank
Core Web Vitals
| LCP | 1.7 s |
| INP | 75 ms |
| CLS | 0 |
| TTFB | 300 ms |
Real user p75, Chrome UX Report, Aug 2026.
Page
- Language: Japanese
- Weight: 2.8 MB · 98 requests
- Structured data: JSON-LD, OpenGraph, Twitter Cards
Homepage as crawled by the HTTP Archive, Sep 2026.
Organisation
- キャッスルベルクリニック
From the homepage's own structured data (Sep 2026).
Infrastructure
- Hosted on Xserver (162.43.101.116)
- Email: no MX record returned, SPF names Xserver
- Email security: SPF (soft fail)
- SSL: Let's Encrypt, RSA 2048, expires Dec 2026
- Common Crawl link graph: rank 10,832,141, 2 hosts
- Verified with: Google
DNS records as swept Oct 2026, certificate as seen Oct 2026. How the web is hosted
Subdomains
| Host | Techs |
|---|---|
| www.castlebell.jp | 17 |
| castlebell.jp | 13 |
Full technology history →
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