What powers jdva.org?
Last seen Sep 2026 · 17 technologies across 13 categories
Analytics
CMS
Databases
Font scripts
JavaScript libraries
Miscellaneous
Page builders
Programming languages
UI frameworks
Video players
Web servers
WordPress plugins
WordPress themes
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 not found
- ai.txt not found
AI Crawlers
No AI crawlers blocked
Audience
Japan
Where the site's Chrome visitors come from, largest estimated audience first.
Open Page Rank
2.20 / 10 · ranked #3,101,350 of all domains
20 referring domains · OpenPageRank
Core Web Vitals
| LCP | 2.6 s |
| INP | 50 ms |
| CLS | 0 |
| TTFB | 2300 ms |
Real user p75, Chrome UX Report, Aug 2026.
Page
- Language: Japanese
- Weight: 5.8 MB · 94 requests
- WordPress theme: lightning · all themes
- Structured data: JSON-LD, OpenGraph, Twitter Cards
Homepage as crawled by the HTTP Archive, Sep 2026.
Organisation
- 日本デフバレー協会
From the homepage's own structured data (Sep 2026).
Infrastructure
- Hosted on GMOCL GMO GlobalSign Holdings K.K. (153.122.205.35)
- Email: no MX record returned
- Email security: SPF (soft fail)
- SSL: GlobalSign, RSA 2048, expires Oct 2026
- Common Crawl link graph: rank 11,327,682, 3 hosts
- Verified with: Google
DNS records as swept Sep 2026, certificate as seen Sep 2026. How the web is hosted
Full technology history →
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Recent changes
- detected Twitter Emoji (Twemoji) Dec 2025