These entries are queried from radb.net using whois, you can try my project getting these.
:AS137835 route6: 2406:840:f440::/44 descr: Natchan V6 NET origin: AS137835 mnt-by: MAINT-NBDHM-CN last-modified: 2020-08-17T04:57:42Z source: APNIC rpki-ov-state: valid route6: 2406:840:f440::/45 descr: Natchan V6 NET origin: AS137835 mnt-by: MAINT-NBDHM-CN last-modified: 2020-08-17T04:57:43Z source: APNIC rpki-ov-state: valid route6: 2406:840:f440::/46 descr: Natchan V6 NET origin: AS137835 mnt-by: MAINT-NBDHM-CN last-modified: 2020-08-17T04:57:45Z source: APNIC rpki-ov-state: valid route6: 2406:840:f440::/47 descr: Natchan V6 NET origin: AS137835 mnt-by: MAINT-NBDHM-CN last-modified: 2020-08-17T04:57:46Z source: APNIC rpki-ov-state: valid route6: 2406:840:f440::/48 descr: Natchan V6 NET origin: AS137835 mnt-by: MAINT-NBDHM-CN last-modified: 2020-08-17T04:57:47Z source: APNIC rpki-ov-state: valid route6: 2406:840:f441::/48 descr: Natchan V6 NET origin: AS137835 mnt-by: MAINT-NBDHM-CN last-modified: 2020-08-17T04:57:49Z source: APNIC rpki-ov-state: valid route6: 2406:840:f442::/47 descr: Natchan V6 NET origin: AS137835 mnt-by: MAINT-NBDHM-CN last-modified: 2020-08-17T04:57:50Z source: APNIC rpki-ov-state: valid route6: 2406:840:f442::/48 descr: Natchan V6 NET origin: AS137835 mnt-by: MAINT-NBDHM-CN last-modified: 2020-08-17T04:57:51Z source: APNIC rpki-ov-state: valid route6: 2406:840:f443::/48 descr: Natchan V6 NET origin: AS137835 mnt-by: MAINT-NBDHM-CN last-modified: 2020-08-17T04:57:53Z source: APNIC rpki-ov-state: valid route6: 2406:840:f444::/46 descr: Natchan V6 NET origin: AS137835 mnt-by: MAINT-NBDHM-CN last-modified: 2020-08-17T04:57:54Z source: APNIC rpki-ov-state: valid route6: 2406:840:f444::/47 descr: Natchan V6 NET origin: AS137835 mnt-by: MAINT-NBDHM-CN last-modified: 2020-08-17T04:57:55Z source: APNIC rpki-ov-state: valid route6: 2406:840:f444::/48 descr: Natchan V6 NET origin: AS137835 mnt-by: MAINT-NBDHM-CN last-modified: 2020-08-17T04:57:57Z source: APNIC rpki-ov-state: valid route6: 2406:840:f445::/48 descr: Natchan V6 NET origin: AS137835 mnt-by: MAINT-NBDHM-CN last-modified: 2020-08-17T04:57:58Z source: APNIC rpki-ov-state: valid route6: 2406:840:f446::/47 descr: Natchan V6 NET origin: AS137835 mnt-by: MAINT-NBDHM-CN last-modified: 2020-08-17T04:57:59Z source: APNIC rpki-ov-state: valid route6: 2406:840:f446::/48 descr: Natchan V6 NET origin: AS137835 mnt-by: MAINT-NBDHM-CN last-modified: 2020-08-17T04:58:00Z source: APNIC rpki-ov-state: valid route6: 2406:840:f447::/48 descr: Natchan V6 NET origin: AS137835 mnt-by: MAINT-NBDHM-CN last-modified: 2020-08-17T04:58:02Z source: APNIC rpki-ov-state: valid route6: 2406:840:f448::/45 descr: Natchan V6 NET origin: AS137835 mnt-by: MAINT-NBDHM-CN last-modified: 2020-08-17T04:58:03Z source: APNIC rpki-ov-state: valid route6: 2406:840:f448::/46 descr: Natchan V6 NET origin: AS137835 mnt-by: MAINT-NBDHM-CN last-modified: 2020-08-17T04:58:04Z source: APNIC rpki-ov-state: valid route6: 2406:840:f448::/47 descr: Natchan V6 NET origin: AS137835 mnt-by: MAINT-NBDHM-CN last-modified: 2020-08-17T04:58:05Z source: APNIC rpki-ov-state: valid route6: 2406:840:f448::/48 descr: Natchan V6 NET origin: AS137835 mnt-by: MAINT-NBDHM-CN last-modified: 2020-08-17T04:58:07Z source: APNIC rpki-ov-state: valid route6: 2406:840:f449::/48 descr: Natchan V6 NET origin: AS137835 mnt-by: MAINT-NBDHM-CN last-modified: 2020-08-17T04:58:08Z source: APNIC rpki-ov-state: valid route6: 2406:840:f44a::/47 descr: Natchan V6 NET origin: AS137835 mnt-by: MAINT-NBDHM-CN last-modified: 2020-08-17T04:58:09Z source: APNIC rpki-ov-state: valid route6: 2406:840:f44a::/48 descr: Natchan V6 NET origin: AS137835 mnt-by: MAINT-NBDHM-CN last-modified: 2020-08-17T04:58:11Z source: APNIC rpki-ov-state: valid route6: 2406:840:f44b::/48 descr: Natchan V6 NET origin: AS137835 mnt-by: MAINT-NBDHM-CN last-modified: 2020-08-17T04:58:12Z source: APNIC rpki-ov-state: valid route6: 2406:840:f44c::/46 descr: Natchan V6 NET origin: AS137835 mnt-by: MAINT-NBDHM-CN last-modified: 2020-08-17T04:58:13Z source: APNIC rpki-ov-state: valid route6: 2406:840:f44c::/47 descr: Natchan V6 NET origin: AS137835 mnt-by: MAINT-NBDHM-CN last-modified: 2020-08-17T04:58:15Z source: APNIC rpki-ov-state: valid route6: 2406:840:f44c::/48 descr: Natchan V6 NET origin: AS137835 mnt-by: MAINT-NBDHM-CN last-modified: 2020-08-17T04:58:16Z source: APNIC rpki-ov-state: valid route6: 2406:840:f44d::/48 descr: Natchan V6 NET origin: AS137835 mnt-by: MAINT-NBDHM-CN last-modified: 2020-08-17T04:58:17Z source: APNIC rpki-ov-state: valid route6: 2406:840:f44e::/47 descr: Natchan V6 NET origin: AS137835 mnt-by: MAINT-NBDHM-CN last-modified: 2020-08-17T04:58:18Z source: APNIC rpki-ov-state: valid route6: 2406:840:f44e::/48 descr: Natchan V6 NET origin: AS137835 mnt-by: MAINT-NBDHM-CN last-modified: 2020-08-17T04:58:20Z source: APNIC rpki-ov-state: valid route6: 2406:840:f44f::/48 descr: Natchan V6 NET origin: AS137835 mnt-by: MAINT-NBDHM-CN last-modified: 2020-08-17T04:58:21Z source: APNIC rpki-ov-state: valid