These entries are queried from radb.net using whois, you can try my project getting these.
:AS393783 route: 12.21.178.0/24 descr: Proxy-registered route for Seibels origin: AS393783 mnt-by: MAINT-AS2711 changed: kevin.houck [at] spiritcom.com 20180519 #10:13:17Z source: RADB last-modified: 2023-11-13T15:53:40Z rpki-ov-state: not_found # No ROAs found, or RPKI validation not enabled for source route: 192.73.223.0/24 descr: Proxy-registered route object origin: AS393783 remarks: This route object is for a Spirit Telecom customer route which is being exported under this origin AS. mnt-by: MAINT-AS2711 changed: kevin.houck [at] spiritcom.com 20180208 #15:58:43Z source: RADB last-modified: 2023-11-13T15:53:17Z rpki-ov-state: not_found # No ROAs found, or RPKI validation not enabled for source