What powers useful-notes.com?
Last seen Sep 2026 · 26 technologies across 14 categories
Advertising
Affiliate programs
CDN
CMS
Databases
Font scripts
JavaScript libraries
Miscellaneous
Performance
Programming languages
Security
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 Oct 2026.
- robots.txt found
- llms.txt found
- ai.txt not found
AI Crawlers
No AI crawlers blocked
Standards: llms.txt
Audience
Japan
Where the site's Chrome visitors come from, largest estimated audience first.
Open Page Rank
0.70 / 10 · ranked #19,311,698 of all domains
4 referring domains · OpenPageRank
Core Web Vitals
| LCP | 1.4 s |
| CLS | 0 |
| TTFB | 700 ms |
Real user p75, Chrome UX Report, Sep 2026.
Page
- Language: Japanese
- Weight: 4.5 MB · 922 requests
- Structured data: JSON-LD
Homepage as crawled by the HTTP Archive, Oct 2026.
Infrastructure
- Hosted on DIGIROCK DigiRock, Inc. (183.90.183.141)
- DNS: rakko.zone
- Email: useful-notes.com
- Email security: SPF (soft fail), DMARC monitor only
- SSL: Let's Encrypt, RSA 2048, expires Nov 2026
- Common Crawl link graph: rank 37,298,952, 2 hosts
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
- detected Priority Hints Sep 2026
- detected Cloudflare Bot Management Jun 2026
- detected AppNexus Feb 2026
- detected Smart Ad Server Nov 2025