iP or domain name lookup

hn.youth.cn Server iP：

Current resolution：

domain resolution record：

2017-09-04-----2017-09-04 112.51.121.179

2017-09-03-----2017-09-03 118.212.135.139

2017-09-03-----2017-09-03 121.11.255.170

2017-09-03-----2017-09-03 114.80.230.254

2017-09-03-----2017-09-03 150.138.170.22

2017-09-03-----2017-09-03 223.111.13.231

2017-09-03-----2017-09-03 221.230.142.17

2017-09-03-----2017-09-03 124.236.98.35

2017-09-03-----2017-09-03 220.164.108.73

2017-09-03-----2017-09-03 113.16.210.129

2017-09-03-----2017-09-03 111.161.121.27

2017-09-03-----2017-09-03 119.36.90.82