What powers pvk.co.jp?
Last seen Aug 2026 · 13 technologies across 11 categories
Advertising
Twitter Ads
since Sep 2021
Analytics
Google Analytics
since Feb 2020
Authentication
Facebook Login
since Sep 2021
CDN
Cloudflare
since Mar 2025
Font scripts
Font Awesome
since Jul 2020
Ionicons
since Jul 2020
Hosting
Sakura Internet
since Aug 2022
JavaScript frameworks
JavaScript libraries
jQuery
since Feb 2020
OWL Carousel
since Jul 2020
Security
Cloudflare Bot Management
since Mar 2025
Web servers
Nginx
since Feb 2020
Widgets
Twitter
since Jul 2020
AI Crawlers
No robots.txt, so all AI crawlers are allowed by default. Checked Sep 2026.
- robots.txt not found
- llms.txt not found
- ai.txt not found
AI Crawlers
No robots.txt, all AI crawlers allowed
Audience
- 100% phone
Japan
Where the site's Chrome visitors come from, largest estimated audience first.
Open Page Rank
3.79 / 10 · ranked #719,550 of all domains
23 referring domains · OpenPageRank
Core Web Vitals
| LCP | 1.3 s |
| INP | 125 ms |
| CLS | 0 |
| TTFB | 300 ms |
Real user p75, Chrome UX Report, Aug 2026.
Page
- Weight: 4.5 MB · 82 requests
- Structured data: OpenGraph, Twitter Cards
Homepage as crawled by the HTTP Archive, Sep 2026.
Organisation
- Kariwasonritsu Library
- Country: Japan
From Wikidata (CC0).
Infrastructure
- Hosted on Sakura Internet (112.78.125.107)
- DNS: Sakura Internet
- Email: pvk.co.jp
- Email security: SPF (soft fail), DMARC monitor only
- Common Crawl link graph: rank 267,325, 2 hosts
DNS records as swept Sep 2026. How the web is hosted
Subdomains
| Host | Techs |
|---|---|
| pvk.co.jp | 11 |
| www.pvk.co.jp | 11 |
Full technology history →
Report an incorrect detection
Recent changes
- detected Cloudflare May 2026
- detected Cloudflare Bot Management May 2026
- dropped Cloudflare Nov 2025
- dropped Cloudflare Bot Management Nov 2025