These entries are queried from radb.net using whois, you can try my project getting these.
:AS38256 route: 124.6.224.0/20 origin: AS38256 descr: Bengal Group Ltd. 34,Kemal Ataturk Avenue,Awal Center, Level 3, Banani mnt-by: MAINT-BD-MHK last-modified: 2020-03-22T10:45:01Z source: APNIC rpki-ov-state: valid route: 124.6.224.0/21 origin: AS38256 descr: Bengal Group Ltd. 34,Kemal Ataturk Avenue,Awal Center, Level 3, Banani mnt-by: MAINT-BD-MHK last-modified: 2017-05-29T06:07:41Z source: APNIC rpki-ov-state: valid route: 124.6.224.0/24 descr: Prisma Digital Network Ltd. Nationwide Internet Service Provider, Bangladesh. country: BD origin: AS38256 mnt-by: MAINT-BD-MHK last-modified: 2009-07-07T08:36:15Z source: APNIC rpki-ov-state: valid route: 124.6.225.0/24 descr: Prisma Digital Network Ltd. Internet Service Provider, Bangladesh. country: BD origin: AS38256 mnt-by: MAINT-BD-MHK last-modified: 2009-07-07T08:40:18Z source: APNIC rpki-ov-state: valid route: 124.6.226.0/24 descr: Prisma Digital Network Ltd. Internet Service Provider, Bangladesh. country: BD origin: AS38256 mnt-by: MAINT-BD-MHK last-modified: 2009-07-07T08:41:18Z source: APNIC rpki-ov-state: valid route: 124.6.227.0/24 descr: Prisma Digital Network Ltd. Internet Service Provider, Bangladesh. country: BD origin: AS38256 mnt-by: MAINT-BD-MHK last-modified: 2009-07-07T08:42:19Z source: APNIC rpki-ov-state: valid route: 124.6.228.0/24 descr: Prisma Digital Network Ltd. Internet Service Provider, Bangladesh. country: BD origin: AS38256 mnt-by: MAINT-BD-MHK last-modified: 2009-07-07T08:42:19Z source: APNIC rpki-ov-state: valid route: 124.6.229.0/24 descr: Prisma Digital Network Ltd. Internet Service Provider, Bangladesh. country: BD origin: AS38256 mnt-by: MAINT-BD-MHK last-modified: 2009-07-07T08:51:20Z source: APNIC rpki-ov-state: valid route: 124.6.230.0/24 descr: Prisma Digital Network Ltd. Internet Service Provider, Bangladesh. origin: AS38256 mnt-by: MAINT-BD-MHK last-modified: 2016-06-24T18:49:26Z source: APNIC rpki-ov-state: valid route: 124.6.231.0/24 descr: Prisma Digital Network Ltd. Internet Service Provider, Bangladesh. origin: AS38256 mnt-by: MAINT-BD-MHK last-modified: 2016-06-24T18:49:46Z source: APNIC rpki-ov-state: valid route: 124.6.232.0/21 origin: AS38256 descr: Bengal Group Ltd. 34,Kemal Ataturk Avenue,Awal Center, Level 3, Banani mnt-by: MAINT-BD-MHK last-modified: 2017-05-29T06:07:41Z source: APNIC rpki-ov-state: valid route: 124.6.232.0/24 descr: Prisma Digital Network Ltd. Internet Service Provider, Bangladesh. origin: AS38256 mnt-by: MAINT-BD-MHK last-modified: 2016-06-24T18:49:57Z source: APNIC rpki-ov-state: valid route: 124.6.233.0/24 descr: Prisma Digital Network Ltd. Internet Service Provider, Bangladesh. origin: AS38256 mnt-by: MAINT-BD-MHK last-modified: 2016-06-24T18:50:06Z source: APNIC rpki-ov-state: valid route: 124.6.234.0/24 descr: Prisma Digital Network Ltd. Internet Service Provider, Bangladesh. origin: AS38256 mnt-by: MAINT-BD-MHK last-modified: 2016-06-24T18:50:16Z source: APNIC rpki-ov-state: valid route: 124.6.235.0/24 descr: Prisma Digital Network Ltd. Internet Service Provider, Bangladesh. origin: AS38256 mnt-by: MAINT-BD-MHK last-modified: 2016-06-24T18:50:24Z source: APNIC rpki-ov-state: valid route: 124.6.236.0/24 descr: Prisma Digital Network Ltd. Internet Service Provider, Bangladesh. origin: AS38256 mnt-by: MAINT-BD-MHK last-modified: 2016-06-24T18:50:33Z source: APNIC rpki-ov-state: valid route: 124.6.237.0/24 descr: Prisma Digital Network Ltd. Internet Service Provider, Bangladesh. origin: AS38256 mnt-by: MAINT-BD-MHK last-modified: 2016-06-24T18:50:43Z source: APNIC rpki-ov-state: valid route: 124.6.238.0/24 descr: Prisma Digital Network Ltd. Internet Service Provider, Bangladesh. origin: AS38256 country: BD mnt-by: MAINT-BD-MHK last-modified: 2009-07-07T08:32:14Z source: APNIC rpki-ov-state: valid route: 124.6.239.0/24 descr: Prisma Digital Network Ltd. Internet Service Provider, Bangladesh. origin: AS38256 mnt-by: MAINT-BD-MHK last-modified: 2016-06-24T18:51:46Z source: APNIC rpki-ov-state: valid