These entries are queried from radb.net using whois, you can try my project getting these.
:AS399012 route: 144.86.180.0/23 origin: AS399012 descr: OrgName: Des Moines Regional Transit Authority (DART) mnt-by: MAINT-AS30036 changed: ezinnel [at] mediacomcc.com 20210518 #16:04:50Z source: RADB last-modified: 2023-11-13T16:05:44Z rpki-ov-state: not_found # No ROAs found, or RPKI validation not enabled for source