These entries are queried from radb.net using whois, you can try my project getting these.
:AS13590 route: 23.129.0.0/24 descr: proxy entry for Marcus Daly Memorial Hospital origin: AS13590 mnt-by: MAINT-CHTR-WD changed: nicholas.etnoyer [at] charter.com 20181102 #17:14:51Z source: RADB last-modified: 2023-11-13T16:11:26Z rpki-ov-state: not_found # No ROAs found, or RPKI validation not enabled for source route: 208.201.36.0/23 descr: NextWeb: R2-KPMG origin: AS13590 notify: routing [at] nextweb.net mnt-by: MAINT-AS16467 changed: charlie [at] nextweb.net 20050401 #20:01:19(UTC) source: RADB last-modified: 2023-11-13T15:39:36Z rpki-ov-state: not_found # No ROAs found, or RPKI validation not enabled for source route: 208.237.61.0/24 descr: AS13590 proxy-registered route by Cogent origin: AS13590 remarks: Proxy-registered route object remarks: for Cogent customer notify: neteng [at] cogentco.com mnt-by: MAINT-AS174 changed: neteng [at] cogentco.com 20031230 source: RADB last-modified: 2023-11-13T15:39:34Z rpki-ov-state: not_found # No ROAs found, or RPKI validation not enabled for source route: 216.237.43.0/24 descr: AS13590 proxy-registered route by Cogent origin: AS13590 remarks: Proxy-registered route object remarks: for Cogent customer notify: neteng [at] cogentco.com mnt-by: MAINT-AS174 changed: neteng [at] cogentco.com 20031230 source: RADB last-modified: 2023-11-13T15:39:34Z rpki-ov-state: not_found # No ROAs found, or RPKI validation not enabled for source