What powers 
number-1.co.jp?
Last seen Oct 2026 · 27 technologies across 15 categories
Analytics
Google Analytics
since Aug 2018
CDN
Amazon CloudFront
since Dec 2021
Google Hosted Libraries
since Mar 2022
Hosting panels
Plesk
since Aug 2018
Issue trackers
Sentry
since Aug 2026
JavaScript frameworks
JavaScript libraries
Miscellaneous
Open Graph
since Sep 2022
Webpack
since Aug 2026
PaaS
Amazon Web Services
since Dec 2021
Vercel
since Aug 2026
Performance
Priority Hints
since Aug 2026
Programming languages
Node.js
since Aug 2026
Security
HSTS
since Jan 2023
Tag managers
Google Tag Manager
since Dec 2021
UI frameworks
Bootstrap
since Oct 2023
Web servers
Apache HTTP Server
since Dec 2021
Nginx
since Aug 2018
Webmail
Google Workspace
since Aug 2022
AI Crawlers
robots.txt could not be read at the last check (Nov 2026), so its policy is unknown.
- robots.txt not checked
- llms.txt not checked
- ai.txt not checked
AI Crawlers
Policy unknown
Audience
- 81% desktop
- 19% phone
Japan
Where the site's Chrome visitors come from, largest estimated audience first.
Open Page Rank
4.05 / 10 · ranked #535,807 of all domains
42 referring domains · OpenPageRank
Core Web Vitals
| LCP | 0.6 s |
| INP | 25 ms |
| CLS | 0 |
| TTFB | 100 ms |
Real user p75, Chrome UX Report, Sep 2026.
Page
- Language: Japanese
- Weight: 2.7 MB · 96 requests
- Structured data: OpenGraph
Homepage as crawled by the HTTP Archive, Oct 2026.
Infrastructure
- Hosted on atworks - A.T.WORKS, Inc. (182.16.229.159)
- DNS: Oracle Cloud DNS
- Email: Google Workspace
- Email security: SPF (soft fail), DMARC monitor only
- SSL: Let's Encrypt, RSA 2048, expires Dec 2026
- Common Crawl link graph: rank 2,462,056, 4 hosts
DNS records as swept Nov 2026, certificate as seen Nov 2026. How the web is hosted
Subdomains
| Host | Techs |
|---|---|
| recruit.number-1.co.jp | 16 |
| www.number-1.co.jp | 9 |
| ir.number-1.co.jp | 8 |
| member.number-1.co.jp | 4 |
Full technology history →
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Recent changes
- dropped All in One SEO Sep 2026
- dropped Contact Form 7 Sep 2026
- dropped Google Font API Sep 2026
- dropped HTTP/3 Sep 2026
- dropped Lightbox Sep 2026
- dropped MySQL Sep 2026
- dropped PHP Sep 2026
- dropped WordPress Sep 2026