What powers 
koyou.co.jp?
Last seen Sep 2026 · 32 technologies across 18 categories
Advertising
Analytics
CDN
CMS
Databases
Ecommerce
Font scripts
JavaScript libraries
Marketing automation
Miscellaneous
PaaS
Performance
Programming languages
Security
SEO
Tag managers
Webmail
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 not found
- ai.txt not found
AI Crawlers
No AI crawlers blocked
Audience
- 85% desktop
- 15% phone
Japan
Where the site's Chrome visitors come from, largest estimated audience first.
Open Page Rank
4.69 / 10 · ranked #364,679 of all domains
79 referring domains · OpenPageRank
Core Web Vitals
| LCP | 1 s |
| INP | 50 ms |
| CLS | 0 |
| TTFB | 300 ms |
Real user p75, Chrome UX Report, Sep 2026.
Page
- Language: Japanese
- Weight: 4.6 MB · 126 requests
- Structured data: OpenGraph
Homepage as crawled by the HTTP Archive, Oct 2026.
Organisation
- Koyou Rentia
- Founded: 1970
- Country: Japan
From Wikidata (CC0).
Infrastructure
- Hosted on Oracle Cloud (150.230.218.183)
- DNS: Onamae.com
- Email: Microsoft 365
- Email security: SPF (soft fail), DMARC monitor only
- SSL: CloudSecure Corporation, RSA 2048, wildcard, expires Dec 2026
- Common Crawl link graph: rank 580,147, 7 hosts
DNS records as swept Oct 2026, certificate as seen Oct 2026. How the web is hosted
Subdomains
| Host | Techs |
|---|---|
| www.koyou.co.jp | 20 |
| office-switch.koyou.co.jp | 16 |
| solar.koyou.co.jp | 13 |
Full technology history →
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Recent changes
- detected Cloudflare Aug 2026
- detected Cloudflare Bot Management Aug 2026
- detected Amazon S3 Jul 2026
- detected Amazon Web Services Jul 2026
- detected core-js Jul 2026
- detected Facebook Pixel Jul 2026
- dropped Priority Hints Jul 2026
- dropped Swiper Jul 2026