These entries are queried from radb.net using whois, you can try my project getting these.
:AS1638 route: 146.88.228.0/22 descr: Mott Community College 1401 E. Court Street Flint MI 48503, USA origin: AS1638 mnt-by: MAINT-AS237 changed: rik [at] merit.edu 20170109 #21:41:43Z source: RADB last-modified: 2023-11-13T15:50:33Z rpki-ov-state: valid route: 146.88.228.0/22 origin: AS1638 descr: Mott Community College 1401 East Court Street Flint, MI 48503 USA admin-c: BARRI191-ARIN tech-c: MNA88-ARIN mnt-by: MNT-MCC-35 created: 2023-09-08T13:02:43Z last-modified: 2023-09-08T13:02:43Z source: ARIN rpki-ov-state: valid route: 192.153.163.0/24 descr: Mott Community College 1401 E. Court Street Flint MI 48502, USA origin: AS1638 mnt-by: MAINT-AS237 changed: ljb [at] merit.edu 20130206 source: RADB last-modified: 2023-11-13T15:44:52Z rpki-ov-state: valid route: 192.153.163.0/24 origin: AS1638 descr: Mott Community College 1401 East Court Street Flint, MI 48503 USA admin-c: BARRI191-ARIN tech-c: MNA88-ARIN mnt-by: MNT-MCC-35-Z created: 2023-09-08T13:01:24Z last-modified: 2023-09-08T13:01:24Z source: ARIN rpki-ov-state: valid route6: 2620:114:5000::/40 origin: AS1638 descr: Mott Community College 1401 East Court Street Flint, MI 48503 USA admin-c: BARRI191-ARIN tech-c: MNA88-ARIN mnt-by: MNT-MCC-35 created: 2023-09-08T13:02:07Z last-modified: 2023-09-08T13:02:07Z source: ARIN rpki-ov-state: valid