These entries are queried from radb.net using whois, you can try my project getting these.
:AS139870 route: 103.146.42.0/23 descr: Internet For All origin: AS139870 mnt-by: MAINT-BCJL-BD last-modified: 2019-12-10T11:48:47Z source: APNIC rpki-ov-state: valid route: 103.146.42.0/24 descr: Internet For All origin: AS139870 mnt-by: MAINT-BCJL-BD last-modified: 2019-12-10T11:49:17Z source: APNIC rpki-ov-state: valid route: 103.146.43.0/24 descr: Internet For All origin: AS139870 mnt-by: MAINT-BCJL-BD last-modified: 2019-12-10T11:49:47Z source: APNIC rpki-ov-state: valid route: 103.244.140.0/24 origin: AS139870 descr: BlueNet Communication JV Ltd. Rupayan Shelford, 17th floor, 23/6 Mirpur Road, Shyamoli, Dhaka-1207 mnt-by: MAINT-BCJL-BD last-modified: 2022-11-06T06:56:39Z country: BD mnt-lower: MAINT-BCJL-BD mnt-routes: MAINT-BCJL-BD source: APNIC rpki-ov-state: valid route: 103.244.141.0/24 descr: Bluenet Communication JV Ltd origin: AS139870 mnt-by: MAINT-BCJL-BD last-modified: 2022-10-18T01:13:52Z source: APNIC rpki-ov-state: valid route: 103.244.142.0/24 descr: BlueNet Communication JV Ltd. Rupayan Shelford, 17th floor, 23/6 Mirpur Road, Shyamoli, Dhaka-1207 origin: AS139870 mnt-by: MAINT-BCJL-BD last-modified: 2022-11-06T06:57:25Z mnt-routes: MAINT-BCJL-BD source: APNIC rpki-ov-state: valid route: 103.244.143.0/24 country: BD mnt-routes: MAINT-BCJL-BD origin: AS139870 descr: BlueNet Communication JV ltd. House 14, Road 02, Sector 06, Uttara mnt-by: MAINT-BCJL-BD last-modified: 2022-11-10T13:09:23Z source: APNIC rpki-ov-state: valid route6: 2001:df2:4380::/48 origin: AS139870 descr: BlueNet Communication JV ltd. House 14, Road 02, Sector 06, Uttara mnt-by: MAINT-BCJL-BD last-modified: 2020-03-07T07:57:48Z source: APNIC rpki-ov-state: valid route6: 2400:5fa0::/32 origin: AS139870 descr: BlueNet Communication JV ltd. House 14, Road 02, Sector 06, Uttara mnt-by: MAINT-BCJL-BD last-modified: 2022-03-08T09:19:20Z source: APNIC rpki-ov-state: valid