What powers gs21.co.jp?
Last seen Oct 2026 · 34 technologies across 17 categories
Analytics
Google Analytics
since Jan 2019
CDN
Amazon CloudFront
since Aug 2026
cdnjs
since Nov 2021
Cloudflare
since May 2022
Google Hosted Libraries
since Feb 2022
jsDelivr
since Sep 2021
CMS
WordPress
since Nov 2022
Databases
MySQL
since Nov 2022
Font scripts
Font Awesome
since Nov 2022
Google Font API
since Sep 2021
JavaScript libraries
Miscellaneous
PaaS
Amazon Web Services
since Aug 2026
Page builders
WordPress Block Editor
since Oct 2024
Performance
Priority Hints
since May 2024
Programming languages
PHP
since Jan 2019
Security
HSTS
since Sep 2022
Really Simple SSL & Security
since May 2024
Tag managers
Google Tag Manager
since Jul 2021
UI frameworks
Bootstrap
since Nov 2022
Web frameworks
CakePHP
since Aug 2026
Web servers
Apache HTTP Server
since Jan 2019
Nginx
since Aug 2026
WordPress plugins
Jetpack
since Nov 2022
W3 Total Cache
since May 2024
AI Crawlers
No robots.txt, so all AI crawlers are allowed by default. Checked Oct 2026.
- robots.txt not found
- llms.txt not found
- ai.txt not found
- Oct 2026 * removed from robots.txt
- Sep 2026 robots.txt removed
AI Crawlers
No robots.txt, all AI crawlers allowed
Audience
- 53% phone
- 47% desktop
Japan
Where the site's Chrome visitors come from, largest estimated audience first.
Open Page Rank
2.80 / 10 · ranked #1,981,057 of all domains
11 referring domains · OpenPageRank
Core Web Vitals
| LCP | 1.2 s |
| INP | 75 ms |
| CLS | 0 |
| TTFB | 300 ms |
Real user p75, Chrome UX Report, Sep 2026.
Page
- Language: Japanese
- Weight: 0.9 MB · 47 requests
Homepage as crawled by the HTTP Archive, Oct 2026.
Infrastructure
- Hosted on Sakura Internet (153.126.213.51)
- DNS: Sakura Internet
- Email: gs21.co.jp
- Email security: SPF (soft fail), DMARC monitor only
- SSL: Amazon Trust Services, RSA 2048, expires Dec 2026
- Common Crawl link graph: rank 9,928,911, 4 hosts
DNS records as swept Oct 2026, certificate as seen Oct 2026. How the web is hosted
Subdomains
| Host | Techs |
|---|---|
| blog.gs21.co.jp | 18 |
| www.gs21.co.jp | 13 |
| chintai.gs21.co.jp | 12 |