iP or domain name lookup

a.cn51mr.com Server iP：

Current resolution：

domain resolution record：

2023-01-09-----2023-01-09 67.21.93.232

2023-01-09-----2023-01-09 67.21.93.250

2019-09-30-----2019-10-11 111.231.78.168

2017-08-30-----2019-07-16 139.199.39.252

2016-12-28-----2016-12-29 119.254.167.243