These entries are queried from radb.net using whois, you can try my project getting these.
:AS18729 route: 50.236.28.0/24 descr: Shawmut Design & Construction origin: AS18729 mnt-by: MAINT-AS27506 changed: robert.hinst [at] crowncastle.com 20190214 #19:39:41Z source: RADB last-modified: 2023-11-13T15:55:41Z rpki-ov-state: valid route: 65.206.9.0/24 descr: SIDERA-CSR- SHAWMUT origin: AS18729 mnt-by: MAINT-AS27506 changed: dataoperations [at] sidera.net 20111129 #23:37:50Z source: RADB last-modified: 2023-11-13T15:42:43Z rpki-ov-state: not_found # No ROAs found, or RPKI validation not enabled for source