iP or domain name lookup

521.email Server iP：

Current resolution：

domain resolution record：

2023-08-24-----2024-04-03 192.250.197.171

2023-08-18-----2023-08-24 107.163.192.22

2023-07-12-----2023-08-16 107.148.73.76

2023-06-27-----2023-06-30 204.74.99.100

2023-05-24-----2023-06-16 103.120.80.111

2021-09-03-----2023-05-17 124.95.191.37

2023-01-31-----2023-05-17 58.211.2.37

2022-03-19-----2023-04-21 117.34.13.37

2021-02-12-----2022-06-12 219.159.84.37

2021-09-25-----2021-11-21 117.34.61.37

2021-02-12-----2021-09-04 150.138.151.37

2021-02-12-----2021-09-04 61.241.118.37

2021-03-11-----2021-03-18 221.178.57.37

2020-10-06-----2021-03-11 58.211.137.150

2020-10-06-----2021-02-14 162.159.210.92

2021-02-12-----2021-02-14 125.39.174.150

2020-10-06-----2020-10-06 162.159.211.92

2020-10-06-----2020-10-06 115.231.187.150

2020-10-06-----2020-10-06 42.236.94.150

2019-07-18-----2019-10-18 122.114.221.14

2019-01-02-----2019-01-02 122.114.220.155