iP or domain name lookup

mail.smartx.com Server iP：

Current resolution：

domain resolution record：

2023-04-06-----2023-04-07 172.217.160.83

2023-04-06-----2023-04-07 172.217.160.115

2023-04-06-----2023-04-07 172.217.163.51

2023-04-06-----2023-04-07 142.251.42.243

2023-04-06-----2023-04-06 142.251.43.19

2023-04-06-----2023-04-06 142.251.220.51

2023-04-06-----2023-04-06 142.250.207.83

2023-04-06-----2023-04-06 142.251.220.83

2023-04-06-----2023-04-06 142.251.220.115