iP or domain name lookup

yb.ctrpg.com Server iP：

Current resolution：

domain resolution record：

2019-08-23-----2019-09-02 172.106.245.195

2017-07-15-----2017-07-18 183.214.128.195

2017-07-14-----2017-07-17 121.29.54.100

2017-07-14-----2017-07-17 27.221.28.174

2017-07-14-----2017-07-17 119.147.33.102

2017-07-14-----2017-07-17 106.117.249.107

2017-07-17-----2017-07-17 58.216.107.101

2017-07-17-----2017-07-17 119.167.164.43

2017-07-17-----2017-07-17 112.29.151.139

2017-07-14-----2017-07-14 112.29.196.206