These entries are queried from radb.net using whois, you can try my project getting these.
:AS23122 route: 138.247.0.0/16 origin: AS23122 descr: Dakota State University Information Technology Services 820 North Washington Ave Madison SD 57042 United States admin-c: NETWO8464-ARIN tech-c: NETWO8464-ARIN mnt-by: MNT-DSU-Z created: 2022-01-06T21:12:38Z last-modified: 2022-01-06T21:12:38Z source: ARIN rpki-ov-state: valid route6: 2607:f558:800::/40 origin: AS23122 descr: Dakota State University Information Technology Services 820 North Washington Ave Madison SD 57042 United States admin-c: NETWO8464-ARIN tech-c: NETWO8464-ARIN mnt-by: MNT-DSU created: 2022-01-06T21:13:32Z last-modified: 2022-01-06T21:13:32Z source: ARIN rpki-ov-state: valid