What powers s21.co.kr?
Last seen Jun 2026 · 10 technologies across 6 categories
CDN
Google Hosted Libraries
since Feb 2022
jQuery CDN
since Feb 2022
JavaScript libraries
Operating systems
UNIX
since May 2019
Programming languages
Java
since May 2019
Web server extensions
Web servers
Apache Tomcat
since May 2019
Audience
- 82% desktop
- 18% phone
South Korea
Countries where the site has Chrome traffic, strongest markets first.
Open Page Rank
1.65 / 10 · ranked #5,287,896 of all domains
8 referring domains · OpenPageRank
Core Web Vitals
| LCP | 0.8 s |
| INP | 25 ms |
| CLS | 0.45 |
| TTFB | 200 ms |
Real user p75, Chrome UX Report, Jun 2026.
Page
- Weight: 0.5 MB · 54 requests
- Structured data: OpenGraph, Twitter Cards
Homepage as crawled by the HTTP Archive, Jul 2026.
Subdomains
| Host | Techs |
|---|---|
| s21.co.kr | 10 |
| www.s21.co.kr | 10 |