These entries are queried from radb.net using whois, you can try my project getting these.
:AS6106 route: 138.23.0.0/16 descr: NET-UC-Riverside origin: AS6106 admin-c: Tim Paul admin-c: Erik McCroskey tech-c: Tim Paul tech-c: Erik McCroskey notify: netops [at] ucr.edu mnt-by: MAINT-AS6106 changed: tim.paul [at] ucr.edu 20061221 #18:21:31(UTC) source: RADB last-modified: 2023-11-13T15:39:38Z rpki-ov-state: not_found # No ROAs found, or RPKI validation not enabled for source route: 169.235.0.0/16 descr: NET-UC-RIVERSIDE origin: AS6106 admin-c: Tim Paul admin-c: Erik McCroskey tech-c: Tim Paul tech-c: Erik McCroskey notify: netops [at] ucr.edu mnt-by: MAINT-AS6106 changed: tim.paul [at] ucr.edu 20061221 #18:30:03(UTC) source: RADB last-modified: 2023-11-13T15:39:38Z rpki-ov-state: not_found # No ROAs found, or RPKI validation not enabled for source route: 192.31.146.0/24 descr: NET-UC-Riverside origin: AS6106 admin-c: Tim Paul admin-c: Erik McCroskey tech-c: Tim Paul tech-c: Erik McCroskey notify: netops [at] ucr.edu mnt-by: MAINT-AS6106 changed: tim.paul [at] ucr.edu 20061221 #18:21:31(UTC) source: RADB last-modified: 2023-11-13T15:39:38Z rpki-ov-state: not_found # No ROAs found, or RPKI validation not enabled for source route6: 2607:f290::/32 origin: AS6106 descr: UCRNET-V6 admin-c: Brent Cunningham admin-c: Jason Marshall tech-c: Brent Cunningham tech-c: Jason Marshall notify: netops [at] ucr.edu mnt-by: MAINT-AS6106 changed: brent.cunningham [at] ucr.edu 20190911 #18:17:01Z source: RADB last-modified: 2023-11-13T15:57:25Z rpki-ov-state: not_found # No ROAs found, or RPKI validation not enabled for source