What powers f21.site?
Last seen Sep 2026 · 6 technologies across 5 categories
Affiliate programs
CPABuild
since Sep 2026
CDN
cdnjs
since Sep 2026
Cloudflare
since Sep 2026
Performance
Cloudflare Rocket Loader
since Sep 2026
Programming languages
Java
since Sep 2026
Web servers
OpenGSE
since Sep 2026
AI Crawlers
Doesn't name any of the 33 AI crawlers we track in its robots.txt. Catch-all rules (User-agent: *) restrict some paths for every crawler, AI or not. Checked Oct 2026.
- robots.txt found
- llms.txt not found
- ai.txt not found
AI Crawlers
No AI crawlers blocked
Audience
- 97% phone
- 3% tablet
Philippines
Indonesia
Kazakhstan
Russia
Brazil
Iraq
Where the site's Chrome visitors come from, largest estimated audience first.
Open Page Rank
0.22 / 10 · ranked #76,453,462 of all domains
0 referring domains · OpenPageRank
Core Web Vitals
| LCP | 4.6 s |
| INP | 250 ms |
| CLS | 0 |
| TTFB | 2000 ms |
Real user p75, Chrome UX Report, Sep 2026.
Page
- Language: English
- CDN: Google
- Weight: 0.8 MB · 31 requests
Homepage as crawled by the HTTP Archive, Oct 2026.
Infrastructure
- Hosted on Google (216.239.32.21)
- DNS: Namecheap
- Email: Namecheap
- Email security: SPF (soft fail), no DMARC record
- SSL: Google Trust Services, RSA 2048, expires Dec 2026
- Common Crawl link graph: rank 69,354,844
DNS records as swept Oct 2026, certificate as seen Oct 2026. How the web is hosted