These entries are queried from radb.net using whois, you can try my project getting these.
:AS62973 route: 192.5.255.0/24 descr: Broadplex-192.5.255.0/24 origin: AS62973 mnt-by: MAINT-AS31863 changed: apack [at] centrilogic.com 20151208 #23:57:27Z source: RADB last-modified: 2023-11-13T16:10:49Z rpki-ov-state: not_found # No ROAs found, or RPKI validation not enabled for source