What powers kobun.co.jp?
Last seen Aug 2026 · 34 technologies across 21 categories
Analytics
CDN
CMS
Databases
Ecommerce
Font scripts
JavaScript Frameworks
JavaScript libraries
Load balancers
Marketing automation
Miscellaneous
Operating systems
PaaS
Programming languages
SEO
Tag managers
Web frameworks
Web server extensions
Web servers
Webmail
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
- Sep 2026 *: Restricted (was Allowed)
- Sep 2026 *: Allowed (was Restricted)
AI Crawlers
No AI crawlers blocked
Audience
- 100% desktop
Japan
Where the site's Chrome visitors come from, largest estimated audience first.
Open Page Rank
4.01 / 10 · ranked #562,103 of all domains
43 referring domains · OpenPageRank
Core Web Vitals
| LCP | 0.8 s |
| INP | 75 ms |
| CLS | 0 |
| TTFB | 300 ms |
Real user p75, Chrome UX Report, Aug 2026.
Page
- Language: Japanese
- CDN: Amazon CloudFront
- Weight: 6.9 MB · 125 requests
- Structured data: JSON-LD, OpenGraph, Twitter Cards
Homepage as crawled by the HTTP Archive, Sep 2026.
Organisation
- 光文書院 (Kobun Shoin on Wikidata)
- Founded: 1945
- Country: Japan
From the homepage's own structured data (Sep 2026) and Wikidata (CC0).
Infrastructure
- Hosted on Amazon Web Services (52.69.41.180)
- DNS: shsvr.net
- Email: no MX record returned
- SSL: Cybertrust Japan, RSA 2048, wildcard, expires Feb 2027
- Common Crawl link graph: rank 1,198,207, 8 hosts
DNS records as swept Sep 2026, certificate as seen Sep 2026. How the web is hosted
Subdomains
| Host | Techs |
|---|---|
| www.kobun.co.jp | 19 |
| login.kobun.co.jp | 13 |
| 1428.kobun.co.jp | 10 |
| 2339.kobun.co.jp | 10 |
| student.trial.cbt-tower.kobun.co.jp | 7 |
| link.kobun.co.jp | 5 |
| order.kobun.co.jp | 4 |