These entries are queried from radb.net using whois, you can try my project getting these.
:AS142639 route: 103.171.140.0/23 origin: AS142639 descr: New Technology Systems Ltd 500 AL Madani Road, Sholakbahar mnt-by: MAINT-NTSL-BD last-modified: 2021-08-13T08:57:25Z source: APNIC rpki-ov-state: valid route: 103.171.140.0/24 origin: AS142639 descr: New Technology Systems Ltd 500 AL Madani Road, Sholakbahar mnt-by: MAINT-NTSL-BD last-modified: 2021-08-22T10:16:13Z source: APNIC rpki-ov-state: valid route: 103.171.141.0/24 origin: AS142639 descr: New Technology Systems Ltd 500 AL Madani Road, Sholakbahar mnt-by: MAINT-NTSL-BD last-modified: 2021-08-22T10:16:42Z source: APNIC rpki-ov-state: valid route6: 2001:df7:4980::/48 origin: AS142639 descr: New Technology Systems Ltd 500 AL Madani Road, Sholakbahar mnt-by: MAINT-NTSL-BD last-modified: 2021-08-13T08:58:42Z source: APNIC rpki-ov-state: valid