What powers isc21.kr?
Last seen Jun 2026 · 20 technologies across 10 categories
JavaScript frameworks
Next.js App Router
since Apr 2026
React
since Apr 2026
JavaScript libraries
Maps
Naver Maps
since Apr 2026
Miscellaneous
Operating systems
Ubuntu
since Apr 2026
Windows Server
since Jul 2022
Performance
Priority Hints
since Apr 2026
Programming languages
Security
HSTS
since Feb 2023
Web servers
Webmail
Microsoft 365
since Feb 2023
Audience
South Korea
Countries where the site has Chrome traffic, strongest markets first.
Open Page Rank
1.69 / 10 · ranked #5,007,058 of all domains
7 referring domains · OpenPageRank
Core Web Vitals
| LCP | 1.6 s |
| INP | 25 ms |
| CLS | 0 |
| TTFB | 900 ms |
Real user p75, Chrome UX Report, Jun 2026.
Page
- Language: Korean
- Weight: 13.1 MB · 70 requests
- Structured data: OpenGraph, Twitter Cards
Homepage as crawled by the HTTP Archive, Jul 2026.
Subdomains
| Host | Techs |
|---|---|
| isc21.kr | 13 |
| www.isc21.kr | 13 |
| kor.isc21.kr | 8 |
| en.isc21.kr | 6 |
Full technology history →
Report an incorrect detection
Recent changes
- detected Naver Maps Apr 2026
- detected Next.js Apr 2026
- detected Next.js App Router Apr 2026
- detected Node.js Apr 2026
- detected Open Graph Apr 2026
- detected Priority Hints Apr 2026
- detected React Apr 2026
- detected styled-components Apr 2026
- detected Ubuntu Apr 2026
- detected Webpack Apr 2026