These entries are queried from radb.net using whois, you can try my project getting these.
:AS137253 route: 103.24.164.0/22 origin: AS137253 descr: DCSG 7000 AMK PTE. LTD. 7000 Ang Mo Kio Ave 5 mnt-by: MAINT-SG-DCSG last-modified: 2019-08-09T07:39:43Z source: APNIC rpki-ov-state: not_found # No ROAs found, or RPKI validation not enabled for source route6: 2406:c300::/32 origin: AS137253 descr: DCSG 7000 AMK PTE. LTD. 7000 Ang Mo Kio Ave 5 mnt-by: MAINT-SG-DCSG last-modified: 2019-08-09T07:39:44Z source: APNIC rpki-ov-state: not_found # No ROAs found, or RPKI validation not enabled for source