What powers textbook-rc.or.jp?
Last seen Aug 2026 · 13 technologies across 10 categories
Analytics
CDN
CMS
Databases
Font scripts
JavaScript libraries
Programming languages
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 not found
- ai.txt not found
AI Crawlers
No AI crawlers blocked
Audience
- 64% desktop
- 36% phone
Japan
Where the site's Chrome visitors come from, largest estimated audience first.
Open Page Rank
4.06 / 10 · ranked #530,499 of all domains
49 referring domains · OpenPageRank
Core Web Vitals
| LCP | 2 s |
| INP | 50 ms |
| CLS | 0 |
| TTFB | 1200 ms |
Real user p75, Chrome UX Report, Aug 2026.
Page
- Language: Japanese
- Weight: 3.2 MB · 61 requests
- WordPress theme: site_textbook-rc · all themes
Homepage as crawled by the HTTP Archive, Sep 2026.
Infrastructure
- Hosted on PSPINC-BDC (216.230.250.133)
- DNS: alpha-mail.jp
- Email: alpha-mail.net
- Email security: no SPF record, no DMARC record
- Common Crawl link graph: rank 1,069,181, 3 hosts
DNS records as swept Sep 2026. How the web is hosted
Full technology history →
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Recent changes
- dropped Font Awesome May 2026
- dropped GoDaddy CoBlocks May 2026
- dropped jQuery Migrate May 2026
- dropped MetaSlider May 2026
- dropped Priority Hints May 2026
- dropped Really Simple SSL & Security May 2026
- dropped RSS May 2026
- dropped Swiper May 2026
- dropped Twenty Fifteen May 2026
- detected Google Font API Apr 2026
- detected Google Hosted Libraries Apr 2026
- detected Jetpack Apr 2026
- detected Polylang Apr 2026
- detected Splide Apr 2026
- detected Twitter Emoji (Twemoji) Apr 2026
- dropped Jetpack Dec 2025