iP or domain name lookup

ir.500.com Server iP：

Current resolution：

domain resolution record：

2021-03-01-----2021-03-01 104.17.206.159

2021-03-01-----2021-03-01 104.17.202.159

2021-03-01-----2021-03-01 104.17.205.159

2021-03-01-----2021-03-01 104.17.203.159

2019-09-26-----2019-11-15 121.14.110.41