What powers 
saiz.co.jp?
Last seen Aug 2026 · 3 technologies across 3 categories
Analytics
JavaScript libraries
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
- 76% desktop
- 24% phone
Japan
Where the site's Chrome visitors come from, largest estimated audience first.
Open Page Rank
3.59 / 10 · ranked #822,163 of all domains
42 referring domains · OpenPageRank
Core Web Vitals
| LCP | 0.9 s |
| INP | 25 ms |
| CLS | 0 |
| TTFB | 400 ms |
Real user p75, Chrome UX Report, Aug 2026.
Page
- Language: Japanese
- Weight: 0.6 MB · 35 requests
Homepage as crawled by the HTTP Archive, Sep 2026.
Organisation
- Saizusha Corporation
- Founded: 1991
- Country: Japan
From Wikidata (CC0).
Infrastructure
- Hosted on PROX Prox System Design Inc. (210.143.102.30)
- DNS: ixent.ne.jp
- Email: saiz.co.jp
- Email security: no SPF record, no DMARC record
- SSL: JPRS, RSA 2048, expires Jan 2027
- Common Crawl link graph: rank 2,430,343, 2 hosts
DNS records as swept Sep 2026, certificate as seen Sep 2026. How the web is hosted
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Recent changes
- dropped Twitter Feb 2026
- dropped Twitter Ads Feb 2026
- dropped Cloudflare Nov 2025
- dropped Cloudflare Bot Management Nov 2025