These entries are queried from radb.net using whois, you can try my project getting these.
:AS397097 route: 23.137.8.0/24 origin: AS397097 descr: IMA, Inc. Portland, ME admin-c: TROUT36-ARIN tech-c: TROUT36-ARIN mnt-by: MNT-IMA-57 created: 2022-07-19T20:28:05Z last-modified: 2022-07-19T20:28:05Z source: ARIN rpki-ov-state: not_found # No ROAs found, or RPKI validation not enabled for source route6: 2602:fb64::/36 origin: AS397097 descr: IMA, Inc. Portland, ME admin-c: TROUT36-ARIN tech-c: TROUT36-ARIN mnt-by: MNT-IMA-57 created: 2022-09-09T10:04:49Z last-modified: 2022-09-09T10:04:49Z source: ARIN rpki-ov-state: not_found # No ROAs found, or RPKI validation not enabled for source route6: 2605:2640::/32 descr: Proxy RO for Transit America origin: AS397097 mnt-by: MAINT-NTTCOM-RA changed: chowser [at] us.ntt.net 20190306 source: NTTCOM rpki-ov-state: not_found # No ROAs found, or RPKI validation not enabled for source