All Docker Hub mirrors currently provided by Chinese universities (University of Science and Technology of China, Shanghai Jiao Tong University, Nanjing University, Chongqing University of Posts and Telecommunications) have been shut down, and announcements for some of these mirror sites have already been removed.
https://web.archive.org/web/20240607005942/https://sjtug.org/post/mirror-news/2024-06-06-takedown-dockerhub/
https://web.archive.org/web/20240608152624/https://doc.nju.edu.cn/books/35f4a/page/docker-hub
The following mirrors are currently available:
hub.rat.dev – Provided by Rat Panel
docker.1panel.live – Provided by 1Panel
docker.m.daocloud.io – Provided by DaoCloud (rate limited)
ccr.ccs.tencentyun.com – Provided by Tencent Cloud (relatively outdated versions)
ustc-edu-cn.mirror.aliyuncs.com – Provided by Alibaba Cloud (relatively outdated versions)