iP or domain name lookup

tu9-universities.de Server iP：

Current resolution：

domain resolution record：

2024-04-23-----2024-04-23 91.204.46.79

2020-12-29-----2021-01-11 54.229.198.190

2020-12-29-----2021-01-11 54.246.236.226

2021-01-04-----2021-01-11 54.220.236.44

2021-01-11-----2021-01-11 52.214.31.173

2021-01-04-----2021-01-08 52.210.98.97

2020-12-29-----2020-12-29 52.50.104.40

2020-12-29-----2020-12-29 52.17.70.220

2019-10-10-----2019-10-10 52.17.24.231

2019-10-10-----2019-10-10 54.194.251.29