Yonsei Data Portal
data.yonsei.ac.kr is an institution-operated data portal — "a collection of data resources for Yonsei University members" — on Yonsei's own registrable domain. It is a client-rendered Next.js application gated to university members, and it publishes no machine-readable surface: /api, /api/health, /openapi.json, /sitemap.xml and /llms.txt all return the application's 404 page. Recorded because the institution genuinely operates it, not because it is callable.