iP or domain name lookup

mail.sina.net Server iP：

Current resolution：

domain resolution record：

2019-06-05-----2024-03-08 49.7.36.125

2019-07-12-----2024-03-08 123.126.45.223

2023-05-30-----2024-03-08 36.51.254.76

2020-05-21-----2023-05-30 39.156.6.189

2019-06-05-----2019-07-16 221.179.190.188

2017-08-01-----2019-06-05 202.108.35.23

2017-08-01-----2018-01-17 218.30.108.198

2017-12-11-----2018-01-17 111.13.88.52

2016-11-19-----2016-12-22 218.30.122.121

2016-12-21-----2016-12-21 202.108.43.238

2016-10-27-----2016-10-27 202.108.3.248