What powers 
whl4u.jp?
Last seen Sep 2026 · 8 technologies across 8 categories
Analytics
Google Analytics
since Aug 2018
Caching
Varnish
since Feb 2019
CDN
Amazon S3
since Jul 2017
Font scripts
Google Font API
since Feb 2020
Miscellaneous
Open Graph
since Sep 2022
PaaS
Amazon Web Services
since Jan 2019
Static site generator
Astro
since Jan 2026
Tag managers
Google Tag Manager
since Aug 2018
AI Crawlers
Doesn't mention any of the 33 AI crawlers we track in its robots.txt; all are allowed by default. Checked Oct 2026.
- robots.txt found
- llms.txt not found
- ai.txt not found
AI Crawlers
No AI crawlers blocked
Audience
Japan
Where the site's Chrome visitors come from, largest estimated audience first.
Open Page Rank
4.69 / 10 · ranked #368,420 of all domains
104 referring domains · OpenPageRank
Core Web Vitals
| LCP | 1.6 s |
| CLS | 0.2 |
| TTFB | 600 ms |
Real user p75, Chrome UX Report, Sep 2026.
Page
- Language: Japanese
- CDN: Fastly
- Weight: 1.6 MB · 51 requests
- Structured data: OpenGraph, Twitter Cards
Homepage as crawled by the HTTP Archive, Sep 2026.
Infrastructure
- Hosted on Fastly (151.101.1.55)
- DNS: Amazon Route 53
- Email: no MX record returned
- SSL: Let's Encrypt, RSA 2048, expires Nov 2026
- Common Crawl link graph: rank 2,377,078, 6 hosts
DNS records as swept Oct 2026, certificate as seen Oct 2026. How the web is hosted
Full technology history →
Report an incorrect detection
Recent changes
- dropped core-js Feb 2026
- dropped Facebook Login Feb 2026
- dropped Facebook Pixel Feb 2026
- dropped jQuery Feb 2026
- dropped jQuery CDN Feb 2026
- dropped Twitter Feb 2026
- dropped Twitter Ads Feb 2026
- detected Astro Jan 2026
- dropped Cloudflare Nov 2025
- dropped Cloudflare Bot Management Nov 2025