iP or domain name lookup

back.sinaapp.com Server iP：

Current resolution：

domain resolution record：

2022-02-01-----2022-02-01 127.0.0.1

2021-10-22-----2021-10-23 220.181.129.60

2021-08-20-----2021-08-20 220.181.136.38

2019-04-03-----2021-03-01 220.181.136.150

2021-03-01-----2021-03-01 220.181.136.132

2019-07-17-----2019-10-28 220.181.136.186

2019-04-03-----2019-04-03 220.181.136.170