What powers d21.or.kr?
Last seen Sep 2026 · 14 technologies across 7 categories
CDN
jQuery CDN
since Apr 2026
jsDelivr
since Apr 2026
CMS
Gnuboard
since Apr 2026
Databases
MySQL
since Apr 2026
Font scripts
JavaScript libraries
Programming languages
PHP
since Apr 2026
Web servers
Apache HTTP Server
since Apr 2026
AI Crawlers
No robots.txt, so all AI crawlers are allowed by default. Checked Sep 2026.
- robots.txt not found
- llms.txt not found
- ai.txt not found
AI Crawlers
No robots.txt, all AI crawlers allowed
Audience
South Korea
Where the site's Chrome visitors come from, largest estimated audience first.
Open Page Rank
1.08 / 10 · ranked #11,381,439 of all domains
5 referring domains · OpenPageRank
Core Web Vitals
| LCP | 0.6 s |
| CLS | 0 |
| TTFB | 100 ms |
Real user p75, Chrome UX Report, Aug 2026.
Page
- Language: Korean
- Weight: 18.2 MB · 72 requests
Homepage as crawled by the HTTP Archive, Sep 2026.
Infrastructure
- Hosted on SMILESERV-AS-KR SMILESERV (49.247.4.133)
- Email: no MX record returned
- SSL: GoGetSSL, RSA 2048, expires Apr 2027
- Common Crawl link graph: rank 28,942,388, 2 hosts
DNS records as swept Aug 2026, certificate as seen Sep 2026. How the web is hosted