What powers sper.jp?
Last seen Sep 2026 · 8 technologies across 8 categories
Analytics
CDN
Font scripts
JavaScript libraries
Miscellaneous
Performance
UI frameworks
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
- 59% phone
- 41% desktop
Japan
Where the site's Chrome visitors come from, largest estimated audience first.
Open Page Rank
1.66 / 10 · ranked #5,243,387 of all domains
4 referring domains · OpenPageRank
Core Web Vitals
| LCP | 0.7 s |
| CLS | 0 |
| TTFB | 200 ms |
Real user p75, Chrome UX Report, Sep 2026.
Page
- Language: English
- Weight: 2.3 MB · 50 requests
- Structured data: JSON-LD, OpenGraph, Twitter Cards
Homepage as crawled by the HTTP Archive, Oct 2026.
Organisation
From the homepage's own structured data (Oct 2026).
Infrastructure
- Hosted on Sakura Internet (133.125.58.159)
- Email: sper.jp
- Email security: SPF (soft fail), no DMARC record
- SSL: Let's Encrypt, RSA 2048, expires Nov 2026
- Common Crawl link graph: rank 16,893,958, 2 hosts
- Verified with: Google
DNS records as swept Sep 2026, certificate as seen Sep 2026. How the web is hosted
Full technology history →
Report an incorrect detection
Recent changes
- dropped Google Maps Sep 2026
- dropped lit-element Sep 2026
- dropped lit-html Sep 2026
- detected Open Graph Jul 2026
- detected Bootstrap Feb 2026
- detected Google Font API Feb 2026
- detected Google Maps Feb 2026
- detected lit-element Feb 2026
- detected lit-html Feb 2026
- detected Priority Hints Feb 2026