iP or domain name lookup

xuexiji1.duapp.com Server iP：

Current resolution：

domain resolution record：

2016-11-22-----2018-01-17 111.202.114.29

2016-11-22-----2018-01-16 123.125.112.229

2016-11-22-----2018-01-16 123.125.112.228

2016-11-26-----2018-01-16 111.202.114.30

2016-01-12-----2017-12-08 111.13.101.137

2016-06-29-----2017-12-08 106.120.159.149

2016-06-29-----2017-12-08 220.181.7.172

2016-06-29-----2017-09-02 111.13.100.104

2016-11-22-----2017-08-29 111.13.100.226

2016-06-29-----2017-03-09 220.181.7.171

2016-01-12-----2016-01-12 180.149.133.153

2016-01-12-----2016-01-12 61.135.185.83

2016-01-12-----2016-01-12 61.135.185.235