iP or domain name lookup

cluster1a.us.messagelabs.com Server iP：

Current resolution：

domain resolution record：

2022-03-24-----2024-08-28 52.207.128.88

2022-07-27-----2024-08-28 54.243.60.31

2022-02-15-----2022-02-15 54.86.78.81

2022-02-15-----2022-02-15 18.235.153.175

2022-02-15-----2022-02-15 52.2.179.173

2022-01-08-----2022-01-08 34.225.49.16

2022-01-08-----2022-01-08 44.198.115.56

2022-01-08-----2022-01-08 54.83.87.114

2021-11-26-----2021-11-26 34.231.11.79

2021-11-26-----2021-11-26 3.233.40.190

2021-11-26-----2021-11-26 35.174.162.180

2019-10-14-----2019-10-14 54.165.135.206

2019-10-14-----2019-10-14 34.205.145.27

2019-06-05-----2019-10-03 52.73.243.182

2019-06-05-----2019-10-03 34.203.43.166

2019-10-02-----2019-10-03 34.204.161.217

2019-06-05-----2019-08-14 34.225.212.74

2017-05-11-----2017-05-11 216.82.251.230

2017-05-11-----2017-05-11 85.158.139.103