What powers zenken.com?
Last seen Aug 2026 · 5 technologies across 5 categories
Analytics
Google Analytics
since Jan 2019
JavaScript libraries
jQuery
since Jan 2019
Operating systems
Windows Server
since Jan 2019
Programming languages
PHP
since Aug 2021
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 Sep 2026.
- robots.txt found
- llms.txt not found
- ai.txt not found
AI Crawlers
No AI crawlers blocked
Audience
- 58% desktop
- 42% phone
Japan
Where the site's Chrome visitors come from, largest estimated audience first.
Open Page Rank
3.40 / 10 · ranked #1,003,896 of all domains
63 referring domains · OpenPageRank
Core Web Vitals
| LCP | 0.5 s |
| INP | 200 ms |
| CLS | 0 |
| TTFB | 300 ms |
Real user p75, Chrome UX Report, Aug 2026.
Page
- Weight: 0.3 MB · 55 requests
Homepage as crawled by the HTTP Archive, Sep 2026.
Organisation
- Japan Construction Engineers' Association
- Country: Japan
From Wikidata (CC0).
Infrastructure
- Hosted on KDDI KDDI CORPORATION (210.196.159.148)
- DNS: alpha-prm.jp
- Email: alpha-prm.jp
- Email security: SPF (soft fail), DMARC monitor only
- SSL: DigiCert, RSA 2048, expires Dec 2026
- Common Crawl link graph: rank 1,219,411, 2 hosts
DNS records as swept Sep 2026, certificate as seen Sep 2026. How the web is hosted
Subdomains
| Host | Techs |
|---|---|
| www.zenken.com | 5 |
| zenken.com | 5 |