iP or domain name lookup

doudi520.duapp.com Server iP：

Current resolution：

domain resolution record：

2017-06-20-----2018-01-17 123.125.112.228

2017-08-01-----2018-01-17 111.202.114.29

2017-03-01-----2018-01-16 123.125.112.229

2017-08-26-----2018-01-16 111.202.114.30

2017-03-01-----2017-12-08 111.13.101.137

2017-03-01-----2017-12-08 220.181.7.172

2017-12-08-----2017-12-08 106.120.159.149

2017-03-01-----2017-09-02 111.13.100.104

2017-06-20-----2017-08-29 111.13.100.226

2017-03-01-----2017-03-01 220.181.7.171