iP or domain name lookup

whoteachus.com Server iP：

Current resolution：

domain resolution record：

2021-11-28-----2022-02-12 121.11.220.194

2021-11-28-----2022-02-12 47.112.155.232

2020-05-01-----2021-02-22 221.228.79.225

2020-08-06-----2021-02-22 163.177.156.228

2020-08-06-----2021-02-22 183.240.168.210

2020-08-06-----2021-02-22 103.227.121.100

2020-08-06-----2021-02-22 14.17.109.66

2020-08-06-----2021-02-22 120.195.158.46

2020-05-01-----2020-05-01 183.232.136.130

2020-05-01-----2020-05-01 113.107.236.195

2020-05-01-----2020-05-01 122.13.211.66

2019-07-12-----2019-07-12 42.120.158.78