iP or domain name lookup

auth6.tsinghua.edu.cn Server iP：

Current resolution：

domain resolution record：

2022-03-15-----2022-03-15 45.33.20.235

2022-03-14-----2022-03-14 45.33.23.183

2022-03-11-----2022-03-12 45.33.30.197

2022-03-11-----2022-03-11 45.33.18.44

2022-03-09-----2022-03-10 72.14.178.174

2022-03-09-----2022-03-09 45.56.79.23

2022-03-08-----2022-03-08 45.79.19.196

2022-03-07-----2022-03-07 185.53.179.172

2020-12-06-----2020-12-16 52.128.23.153

2019-10-09-----2019-10-09 159.69.186.9