What powers 
challenge-seo.jp?
Last seen Sep 2026 · 26 technologies across 16 categories
Advertising
Analytics
CDN
CMS
Databases
Hosting
JavaScript libraries
Marketing automation
Miscellaneous
Page builders
Programming languages
Security
SEO
Tag managers
Video players
Web servers
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 Oct 2026.
- robots.txt found
- llms.txt found
- ai.txt not found
- Oct 2026 llms.txt appeared
AI Crawlers
No AI crawlers blocked
Standards: llms.txt
Audience
- 72% desktop
- 28% phone
Japan
Where the site's Chrome visitors come from, largest estimated audience first.
Open Page Rank
4.19 / 10 · ranked #461,773 of all domains
79 referring domains · OpenPageRank
Core Web Vitals
| LCP | 2 s |
| CLS | 0 |
| TTFB | 1000 ms |
Real user p75, Chrome UX Report, Sep 2026.
Page
- Language: Japanese
- Weight: 26.1 MB · 187 requests
- Structured data: JSON-LD, OpenGraph, Twitter Cards
Homepage as crawled by the HTTP Archive, Oct 2026.
Organisation
From the homepage's own structured data (Oct 2026).
Infrastructure
- Hosted on Xserver (103.3.1.32)
- 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 11,293,197
DNS records as swept Oct 2026, certificate as seen Oct 2026. How the web is hosted
Full technology history →
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Recent changes
- dropped Draftpress HFCM Sep 2026
- dropped Moment.js Sep 2026