These entries are queried from radb.net using whois, you can try my project getting these.
:AS3671 route: 134.79.0.0/16 descr: SU-SLAC Stanford SLAC Net Stanford Linear Accelerator Center Stanford CA 94309, USA origin: AS3671 mnt-by: MAINT-ESNET changed: yhines [at] es.net 20000128 source: RADB last-modified: 2023-11-13T15:39:32Z rpki-ov-state: not_found # No ROAs found, or RPKI validation not enabled for source route: 192.68.191.0/24 descr: SU-SLAC Stanford SLAC Net Stanford Linear Accelerator Center Stanford CA 94309, USA origin: AS3671 mnt-by: MAINT-ESNET changed: hostmaster [at] es.net 20120202 #22:19:39Z source: RADB last-modified: 2023-11-13T15:41:58Z rpki-ov-state: not_found # No ROAs found, or RPKI validation not enabled for source route: 198.51.111.0/24 descr: Stanford SLAC Net Stanford Linear Accelerator Center Stanford CA 94309, USA origin: AS3671 mnt-by: MAINT-ESNET changed: yhines [at] es.net 20020408 source: RADB last-modified: 2023-11-13T15:39:32Z rpki-ov-state: not_found # No ROAs found, or RPKI validation not enabled for source route6: 2620:114:d000::/44 descr: SU-SLAC Stanford SLAC Net (IPv6) Stanford Linear Accelerator Center Stanford CA 94309, USA origin: AS3671 mnt-by: MAINT-ESNET changed: hostmaster [at] es.net 20130307 #22:25:58Z source: RADB last-modified: 2023-11-13T15:45:12Z rpki-ov-state: not_found # No ROAs found, or RPKI validation not enabled for source