These entries are queried from radb.net using whois, you can try my project getting these.
:AS29833 route: 64.186.38.0/24 origin: AS29833 descr: US Signal Downstream Customer - Medical Informatics Engineering, Inc. - AS29833 mnt-by: MAINT-AS26554 changed: toc [at] ussignal.com 20231204 # 1500Z source: RADB last-modified: 2023-12-04T15:00:38Z rpki-ov-state: not_found # No ROAs found, or RPKI validation not enabled for source route: 64.186.39.0/24 origin: AS29833 descr: US Signal Downstream Customer - Medical Informatics Engineering, Inc. - AS29833 mnt-by: MAINT-AS26554 changed: toc [at] ussignal.com 20231204 # 1459Z source: RADB last-modified: 2023-12-04T15:00:00Z rpki-ov-state: not_found # No ROAs found, or RPKI validation not enabled for source route: 64.186.40.0/24 origin: AS29833 descr: US Signal Downstream Customer - Medical Informatics Engineering, Inc. - AS29833 mnt-by: MAINT-AS26554 changed: toc [at] ussignal.com 20231204 # 1459Z source: RADB last-modified: 2023-12-04T14:59:03Z rpki-ov-state: not_found # No ROAs found, or RPKI validation not enabled for source route: 184.175.182.0/24 descr: Medical_Informatics_Engineering origin: AS29833 mnt-by: PHOENIXNAP-MNT changed: zorans [at] phoenixnap.com 20220117 source: LEVEL3 rpki-ov-state: not_found # No ROAs found, or RPKI validation not enabled for source route: 184.175.182.0/24 origin: AS29833 descr: US Signal Downstream Customer - Medical Informatics Engineering, Inc. - AS29833 mnt-by: MAINT-AS26554 changed: toc [at] ussignal.com 20231204 # 1514Z source: RADB last-modified: 2023-12-04T15:14:30Z rpki-ov-state: not_found # No ROAs found, or RPKI validation not enabled for source