These entries are queried from radb.net using whois, you can try my project getting these.
:AS135988 route: 103.143.140.0/23 descr: Customer of Viettel SUNGROUP-AS-VN origin: AS135988 notify: noc_ip [at] viettel.com.vn mnt-by: MAINT-VIETTEL changed: noc_ip@viettel 20191004 source: NTTCOM rpki-ov-state: not_found # No ROAs found, or RPKI validation not enabled for source route: 103.143.140.0/24 descr: Customer of Viettel SUNGROUP-AS-VN origin: AS135988 notify: noc_ip [at] viettel.com.vn mnt-by: MAINT-VIETTEL changed: noc_ip@viettel 20191004 source: NTTCOM rpki-ov-state: not_found # No ROAs found, or RPKI validation not enabled for source route: 103.143.141.0/24 descr: Customer of Viettel SUNGROUP-AS-VN origin: AS135988 notify: noc_ip [at] viettel.com.vn mnt-by: MAINT-VIETTEL changed: noc_ip@viettel 20191004 source: NTTCOM rpki-ov-state: not_found # No ROAs found, or RPKI validation not enabled for source