iP or domain name lookup

ios.1duw.com Server iP：

Current resolution：

domain resolution record：

2019-08-27-----2019-09-01 154.206.42.28

2017-07-04-----2017-09-20 162.159.209.55

2017-09-20-----2017-09-20 58.211.137.140

2017-09-20-----2017-09-20 122.190.3.140

2017-09-20-----2017-09-20 115.231.187.140

2017-09-20-----2017-09-20 117.34.14.140

2017-07-04-----2017-07-05 117.34.14.158

2017-07-05-----2017-07-05 116.31.127.158

2017-07-04-----2017-07-04 58.211.137.158

2017-07-04-----2017-07-04 59.51.81.230

2017-07-04-----2017-07-04 42.236.94.158