iP or domain name lookup

bb.unist.ac.kr Server iP：

Current resolution：

domain resolution record：

2021-06-12-----2021-06-12 3.37.7.123

2021-06-12-----2021-06-12 13.124.31.194

2021-06-01-----2021-06-01 3.34.61.189

2021-06-01-----2021-06-01 13.124.133.114

2020-03-14-----2020-03-14 15.164.88.118

2020-03-14-----2020-03-14 52.78.20.23

2019-08-21-----2019-08-21 52.220.117.66

2019-08-21-----2019-08-21 52.220.179.242

2018-04-25-----2018-04-26 114.70.1.56