These entries are queried from radb.net using whois, you can try my project getting these.
:AS157 route: 192.48.152.0/21 descr: Nextweb: R2-SiliconGraphics origin: AS157 mnt-by: MAINT-AS16467 changed: routing [at] nextweb.net 20141211 #20:10:26Z source: RADB last-modified: 2023-11-13T15:47:01Z rpki-ov-state: not_found # No ROAs found, or RPKI validation not enabled for source route: 192.48.168.0/21 descr: Nextweb: R2-SiliconGraphics origin: AS157 mnt-by: MAINT-AS16467 changed: routing [at] nextweb.net 20141211 #20:11:25Z source: RADB last-modified: 2023-11-13T15:47:01Z rpki-ov-state: not_found # No ROAs found, or RPKI validation not enabled for source