What powers classu.co.kr?
Last seen Jun 2026 · 25 technologies across 13 categories
Advertising
Criteo
since Feb 2025
Twitter Ads
since Jan 2022
Analytics
CDN
Amazon CloudFront
since May 2023
cdnjs
since Jul 2024
Cloudflare
since Jul 2024
jsDelivr
since Apr 2022
JavaScript frameworks
JavaScript libraries
Miscellaneous
PaaS
Amazon Web Services
since Aug 2022
Performance
Priority Hints
since Mar 2026
Programming languages
Node.js
since Sep 2021
Security
Cloudflare Bot Management
since Oct 2024
HSTS
since May 2023
Tag managers
Google Tag Manager
since Sep 2021
Web servers
Webmail
Google Workspace
since Aug 2022
Audience
- 55% phone
- 44% desktop
- 1% tablet
South Korea
Countries where the site has Chrome traffic, strongest markets first.
Open Page Rank
2.52 / 10 · ranked #2,455,746 of all domains
19 referring domains · OpenPageRank
Core Web Vitals
| LCP | 2.3 s |
| INP | 100 ms |
| CLS | 0 |
| TTFB | 700 ms |
Real user p75, Chrome UX Report, Jun 2026.
Page
- Language: Korean
- CDN: Amazon CloudFront
- Weight: 4.3 MB · 180 requests
- Structured data: OpenGraph, Twitter Cards
Homepage as crawled by the HTTP Archive, Jul 2026.
Full technology history →
Report an incorrect detection
Recent changes
- detected Cloudflare Bot Management May 2026
- detected Priority Hints Mar 2026
- dropped Cloudflare Bot Management Dec 2025