What powers as-tetra.info?
Last seen Oct 2026 · 9 technologies across 8 categories
Analytics
Google Analytics
since Dec 2020
Caching
Varnish
since Oct 2026
CDN
Fastly
since Oct 2026
Google Hosted Libraries
since Aug 2022
Font scripts
Font Awesome
since Dec 2020
JavaScript libraries
PaaS
GitHub Pages
since Oct 2026
Web servers
Nginx
since Dec 2020
Webmail
Google Workspace
since Aug 2022
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
AI Crawlers
No robots.txt, all AI crawlers allowed
Audience
Japan
Where the site's Chrome visitors come from, largest estimated audience first.
Open Page Rank
2.81 / 10 · ranked #1,959,783 of all domains
40 referring domains · OpenPageRank
Core Web Vitals
| LCP | 1.3 s |
| CLS | 0.15 |
| TTFB | 500 ms |
Real user p75, Chrome UX Report, Sep 2026.
Page
- CDN: Fastly
- Weight: 0.4 MB · 31 requests
Homepage as crawled by the HTTP Archive, Oct 2026.
Infrastructure
- Hosted on Fastly (185.199.108.153)
- DNS: Sakura Internet
- Email: Google Workspace
- Email security: no SPF record, no DMARC record
- SSL: Let's Encrypt, RSA 2048, expires Jan 2027
- Common Crawl link graph: rank 3,096,778, 2 hosts
DNS records as swept Oct 2026, certificate as seen Oct 2026. How the web is hosted