What powers 4yu.dev?
Last seen Oct 2026 · 15 technologies across 11 categories
Analytics
Google Analytics
since Nov 2024
Caching
Varnish
since Nov 2024
CDN
Font scripts
Font Awesome
since Nov 2024
JavaScript libraries
Live chat
Chatra
since Nov 2024
Miscellaneous
Open Graph
since Nov 2024
PaaS
GitHub Pages
since Nov 2024
Programming languages
Node.js
since Nov 2024
Security
HSTS
since Nov 2024
Static site generator
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
Taiwan
Where the site's Chrome visitors come from, largest estimated audience first.
Open Page Rank
0.26 / 10 · ranked #66,345,100 of all domains
0 referring domains · OpenPageRank
Core Web Vitals
| LCP | 1.8 s |
| CLS | 0 |
| TTFB | 700 ms |
Real user p75, Chrome UX Report, Sep 2026.
Page
- Language: Chinese (Taiwan)
- CDN: Fastly
- Weight: 7.6 MB · 56 requests
- Structured data: JSON-LD, OpenGraph, Twitter Cards
Homepage as crawled by the HTTP Archive, Oct 2026.
Infrastructure
- Hosted on Fastly (185.199.108.153)
- DNS: Cloudflare DNS
- Email: Cloudflare Email Routing
- Email security: SPF (soft fail), no DMARC record
- SSL: Let's Encrypt, RSA 2048, expires Jan 2027
- Common Crawl link graph: rank 92,976,575
DNS records as swept Oct 2026, certificate as seen Oct 2026. How the web is hosted