These entries are queried from radb.net using whois, you can try my project getting these.
:AS53903 route: 136.143.135.0/24 descr: Secom proxy route object for AS53903 origin: AS53903 mnt-by: MAINT-AS16832 changed: miked [at] secom.net 20220310 source: ALTDB rpki-ov-state: not_found # No ROAs found, or RPKI validation not enabled for source route: 136.143.137.0/24 descr: Secom proxy route object for AS53903 origin: AS53903 mnt-by: MAINT-AS16832 changed: miked [at] secom.net 20220310 source: ALTDB rpki-ov-state: not_found # No ROAs found, or RPKI validation not enabled for source route: 208.123.140.0/22 descr: Secom proxy route object for AS53903 origin: AS53903 mnt-by: MAINT-AS16832 changed: miked [at] secom.net 20220310 source: ALTDB rpki-ov-state: not_found # No ROAs found, or RPKI validation not enabled for source route: 208.123.140.0/22 descr: Secom proxy route object for AS53903 origin: AS53903 mnt-by: MNT-SECOM-2 changed: johne [at] secom.net 20150313 source: ARIN rpki-ov-state: not_found # No ROAs found, or RPKI validation not enabled for source route: 208.123.144.0/22 descr: Secom proxy route object for AS53903 origin: AS53903 mnt-by: MAINT-AS16832 changed: miked [at] secom.net 20220310 source: ALTDB rpki-ov-state: not_found # No ROAs found, or RPKI validation not enabled for source route: 208.123.144.0/22 descr: Secom proxy route object for AS53903 origin: AS53903 mnt-by: MNT-SECOM-2 changed: johne [at] secom.net 20150313 source: ARIN rpki-ov-state: not_found # No ROAs found, or RPKI validation not enabled for source route: 208.123.144.0/24 descr: Secom proxy route object for AS53903 origin: AS53903 mnt-by: MAINT-AS16832 changed: miked [at] secom.net 20220310 source: ALTDB rpki-ov-state: not_found # No ROAs found, or RPKI validation not enabled for source