iP or domain name lookup

ldnstest.yfcdn.net Server iP：

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domain resolution record：

2019-12-16-----2021-09-30 139.215.238.161

2019-12-16-----2021-09-30 139.215.238.160

2021-02-04-----2021-09-30 139.215.238.159

2019-12-16-----2019-12-16 139.215.238.166

2019-12-16-----2019-12-16 139.215.238.152

2019-12-16-----2019-12-16 139.215.238.150

2019-12-16-----2019-12-16 139.215.238.157

2019-12-16-----2019-12-16 139.215.238.169

2019-12-16-----2019-12-16 139.215.238.167

2019-12-16-----2019-12-16 139.215.238.162

2019-12-16-----2019-12-16 139.215.238.158

2019-12-16-----2019-12-16 139.215.238.165