iP or domain name lookup

cluster1out.us.messagelabs.com Server iP：

Current resolution：

domain resolution record：

2019-08-14-----2021-08-05 67.219.246.96

2019-08-14-----2021-08-05 67.219.250.192

2019-08-14-----2021-08-05 67.219.250.202

2019-08-14-----2021-08-05 67.219.250.106

2019-09-28-----2021-08-05 67.219.246.192

2019-09-29-----2021-08-05 67.219.246.202

2019-10-03-----2021-08-05 67.219.250.96

2020-02-20-----2021-08-05 67.219.246.108

2019-08-14-----2020-02-26 67.219.246.106

2019-12-06-----2020-02-26 67.219.250.204

2020-02-20-----2020-02-26 67.219.246.204

2020-02-20-----2020-02-20 67.219.250.108

2019-08-14-----2019-12-06 67.219.251.58

2019-08-14-----2019-12-06 67.219.251.48

2019-08-14-----2019-10-08 67.219.247.48

2019-09-28-----2019-10-04 67.219.247.58

2017-03-03-----2017-03-04 216.82.242.44

2017-03-03-----2017-03-03 216.82.241.243

2017-03-03-----2017-03-03 216.82.249.179

2017-03-03-----2017-03-03 216.82.249.211

2017-03-03-----2017-03-03 216.82.241.131

2017-03-03-----2017-03-03 216.82.251.43