Hi, RSSAC Caucus, I would like to share with you a research paper that has just been accepted by TDSC. This paper is a measurement study of DNS root server instances from a China-wide perspective. Specifically, we identified deployment issues with root server instances and uncovered security issues with unauthorized instances. This study was completed by my research team, and the first draft has been presented at the Passive and Active Measurement Conference 2022. If you have any questions, please let me know. Baojun Liu. Tsinghua University.