What powers yjack.kr?
Last seen Sep 2026 · 30 technologies across 14 categories
Advertising
Analytics
CDN
Ecommerce
Font scripts
Issue trackers
JavaScript frameworks
JavaScript libraries
Live chat
Miscellaneous
Programming languages
Security
Video players
Web servers
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 Sep 2026.
- robots.txt found
- llms.txt found
- ai.txt not found
- Sep 2026 llms.txt appeared
AI Crawlers
No AI crawlers blocked
Standards: llms.txt
Audience
- 100% phone
South Korea
Where the site's Chrome visitors come from, largest estimated audience first.
Open Page Rank
0.58 / 10 · ranked #22,452,424 of all domains
2 referring domains · OpenPageRank
Core Web Vitals
| LCP | 1.2 s |
| INP | 75 ms |
| CLS | 0 |
| TTFB | 600 ms |
Real user p75, Chrome UX Report, Aug 2026.
Page
- Language: Korean
- Weight: 8.5 MB · 167 requests
- Structured data: Microdata, OpenGraph
Homepage as crawled by the HTTP Archive, Sep 2026.
Infrastructure
- Hosted on Korea Telecom (183.111.139.224)
- DNS: Cafe24
- Email: no MX record returned
- SSL: Let's Encrypt, RSA 2048, expires Nov 2026
- Common Crawl link graph: rank 28,643,053, 2 hosts
DNS records as swept Sep 2026, certificate as seen Sep 2026. How the web is hosted
Subdomains
| Host | Techs |
|---|---|
| m.yjack.kr | 26 |
| yjack.kr | 19 |
Full technology history →
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Recent changes
- detected Channel.io Aug 2026
- dropped Mautic Aug 2026
- detected React Aug 2026
- detected styled-components Aug 2026
- detected Mautic Jun 2026