These entries are queried from radb.net using whois, you can try my project getting these.
:AS397029 route: 168.91.48.0/21 origin: AS397029 descr: Created by CCI on behalf of OCIO - STATE OF IOWA mnt-by: MAINT-CCI changed: uttam.dhodary [at] consolidated.com 20200925 #15:10:51Z source: RADB last-modified: 2023-11-13T16:01:58Z rpki-ov-state: not_found # No ROAs found, or RPKI validation not enabled for source