iP or domain name lookup

cn2.cs101.express Server iP：

Current resolution：

domain resolution record：

2024-06-26-----2024-06-26 20.255.105.103

2024-06-26-----2024-06-26 20.2.48.244

2024-05-20-----2024-05-20 20.6.154.166

2024-04-29-----2024-04-29 20.239.233.56

2024-04-20-----2024-04-22 20.239.241.15

2024-04-22-----2024-04-22 20.255.113.197

2024-03-05-----2024-03-06 4.191.74.180

2024-03-06-----2024-03-06 20.255.217.28

2024-02-06-----2024-02-08 20.255.40.102

2024-02-07-----2024-02-08 20.255.42.43

2024-01-29-----2024-01-29 4.191.74.112

2024-01-29-----2024-01-29 20.2.49.47

2024-01-23-----2024-01-23 20.255.218.248

2024-01-23-----2024-01-23 4.144.56.58