iP or domain name lookup

cdn16.classroom.google.com Server iP：

Current resolution：

domain resolution record：

2023-01-13-----2024-02-27 45.56.79.23

2024-02-10-----2024-02-10 173.255.194.134

2022-11-16-----2023-12-24 45.79.19.196

2023-10-25-----2023-10-25 72.14.178.174

2023-08-27-----2023-09-12 45.33.23.183

2023-01-13-----2023-01-13 45.33.18.44

2022-09-11-----2022-09-11 199.59.243.200

2020-12-30-----2020-12-31 199.59.242.154