These entries are queried from radb.net using whois, you can try my project getting these.
:AS4578 route: 209.251.240.0/24 origin: AS4578 descr: Network Center Inc. 3487 S. University Dr. Fargo ND 58104 United States admin-c: CARLS356-ARIN tech-c: DAHLE-ARIN mnt-by: MNT-NETWOR-379 created: 2022-03-15T15:39:55Z last-modified: 2022-03-15T15:39:55Z source: ARIN rpki-ov-state: not_found # No ROAs found, or RPKI validation not enabled for source route: 209.251.240.0/24 descr: Network Center origin: AS4578 mnt-by: MAINT-AS26794 changed: sfrank [at] dakotacarrier.com 20170410 #18:43:36Z source: RADB last-modified: 2023-11-13T15:58:34Z rpki-ov-state: not_found # No ROAs found, or RPKI validation not enabled for source