These entries are queried from radb.net using whois, you can try my project getting these.
:AS137432 route: 103.108.88.0/22 descr: BKB Network country: BD mnt-lower: MAINT-BKBNET-BD mnt-routes: MAINT-BKBNET-BD origin: AS137432 mnt-by: MAINT-BKBNET-BD last-modified: 2018-01-29T08:04:51Z source: APNIC rpki-ov-state: valid route: 103.108.88.0/23 descr: BKB Network country: BD mnt-lower: MAINT-BKBNET-BD mnt-routes: MAINT-BKBNET-BD origin: AS137432 mnt-by: MAINT-BKBNET-BD last-modified: 2018-01-29T08:04:51Z source: APNIC rpki-ov-state: valid route: 103.108.88.0/24 descr: BKB Network country: BD mnt-lower: MAINT-BKBNET-BD mnt-routes: MAINT-BKBNET-BD origin: AS137432 mnt-by: MAINT-BKBNET-BD last-modified: 2018-01-29T08:04:52Z source: APNIC rpki-ov-state: valid route: 103.108.89.0/24 descr: BKB Network country: BD mnt-lower: MAINT-BKBNET-BD mnt-routes: MAINT-BKBNET-BD origin: AS137432 mnt-by: MAINT-BKBNET-BD last-modified: 2018-01-29T08:04:52Z source: APNIC rpki-ov-state: valid route: 103.108.90.0/23 descr: BKB Network country: BD mnt-lower: MAINT-BKBNET-BD mnt-routes: MAINT-BKBNET-BD origin: AS137432 mnt-by: MAINT-BKBNET-BD last-modified: 2018-01-29T08:04:52Z source: APNIC rpki-ov-state: valid route: 103.108.90.0/24 descr: BKB Network country: BD mnt-lower: MAINT-BKBNET-BD mnt-routes: MAINT-BKBNET-BD origin: AS137432 mnt-by: MAINT-BKBNET-BD last-modified: 2018-01-29T08:04:52Z source: APNIC rpki-ov-state: valid route: 103.108.91.0/24 descr: BKB Network country: BD mnt-lower: MAINT-BKBNET-BD mnt-routes: MAINT-BKBNET-BD origin: AS137432 mnt-by: MAINT-BKBNET-BD last-modified: 2018-01-29T08:04:52Z source: APNIC rpki-ov-state: valid route6: 2402:68c0::/32 origin: AS137432 descr: MD Bahauddin Khan Shiddhirgonj, Power House mnt-by: MAINT-BKBNET-BD last-modified: 2020-05-23T23:45:22Z source: APNIC rpki-ov-state: valid route6: 2402:68c0::/36 origin: AS137432 descr: MD Bahauddin Khan Shiddhirgonj, Power House mnt-by: MAINT-BKBNET-BD last-modified: 2020-05-23T23:46:05Z source: APNIC rpki-ov-state: valid route6: 2402:68c0:1000::/36 origin: AS137432 descr: MD Bahauddin Khan Shiddhirgonj, Power House mnt-by: MAINT-BKBNET-BD last-modified: 2020-05-23T23:46:40Z source: APNIC rpki-ov-state: valid route6: 2402:68c0:2000::/36 origin: AS137432 descr: MD Bahauddin Khan Shiddhirgonj, Power House mnt-by: MAINT-BKBNET-BD last-modified: 2020-05-23T23:47:09Z source: APNIC rpki-ov-state: valid route6: 2402:68c0:3000::/36 origin: AS137432 descr: MD Bahauddin Khan Shiddhirgonj, Power House mnt-by: MAINT-BKBNET-BD last-modified: 2020-05-23T23:48:11Z source: APNIC rpki-ov-state: valid route6: 2402:68c0:4000::/36 origin: AS137432 descr: MD Bahauddin Khan Shiddhirgonj, Power House mnt-by: MAINT-BKBNET-BD last-modified: 2020-05-23T23:48:48Z source: APNIC rpki-ov-state: valid route6: 2402:68c0:5000::/36 origin: AS137432 descr: MD Bahauddin Khan Shiddhirgonj, Power House mnt-by: MAINT-BKBNET-BD last-modified: 2020-05-23T23:49:11Z source: APNIC rpki-ov-state: valid route6: 2402:68c0:6000::/36 origin: AS137432 descr: MD Bahauddin Khan Shiddhirgonj, Power House mnt-by: MAINT-BKBNET-BD last-modified: 2020-05-23T23:49:31Z source: APNIC rpki-ov-state: valid route6: 2402:68c0:7000::/36 origin: AS137432 descr: MD Bahauddin Khan Shiddhirgonj, Power House mnt-by: MAINT-BKBNET-BD last-modified: 2020-05-23T23:50:24Z source: APNIC rpki-ov-state: valid route6: 2402:68c0:8000::/36 origin: AS137432 descr: MD Bahauddin Khan Shiddhirgonj, Power House mnt-by: MAINT-BKBNET-BD last-modified: 2020-05-23T23:50:50Z source: APNIC rpki-ov-state: valid route6: 2402:68c0:9000::/36 origin: AS137432 descr: MD Bahauddin Khan Shiddhirgonj, Power House mnt-by: MAINT-BKBNET-BD last-modified: 2020-05-23T23:51:30Z source: APNIC rpki-ov-state: valid route6: 2402:68c0:a000::/36 origin: AS137432 descr: MD Bahauddin Khan Shiddhirgonj, Power House mnt-by: MAINT-BKBNET-BD last-modified: 2020-05-23T23:52:24Z source: APNIC rpki-ov-state: valid route6: 2402:68c0:a000::/48 origin: AS137432 descr: MD Bahauddin Khan Shiddhirgonj, Power House mnt-by: MAINT-BKBNET-BD last-modified: 2022-12-14T03:21:25Z source: APNIC rpki-ov-state: valid route6: 2402:68c0:a001::/48 origin: AS137432 descr: MD Bahauddin Khan Shiddhirgonj, Power House mnt-by: MAINT-BKBNET-BD last-modified: 2023-01-15T08:23:51Z source: APNIC rpki-ov-state: valid route6: 2402:68c0:b000::/36 origin: AS137432 descr: MD Bahauddin Khan Shiddhirgonj, Power House mnt-by: MAINT-BKBNET-BD last-modified: 2020-05-23T23:52:50Z source: APNIC rpki-ov-state: valid route6: 2402:68c0:c000::/36 origin: AS137432 descr: MD Bahauddin Khan Shiddhirgonj, Power House mnt-by: MAINT-BKBNET-BD last-modified: 2020-05-23T23:53:24Z source: APNIC rpki-ov-state: valid route6: 2402:68c0:d000::/36 origin: AS137432 descr: MD Bahauddin Khan Shiddhirgonj, Power House mnt-by: MAINT-BKBNET-BD last-modified: 2020-05-23T23:53:54Z source: APNIC rpki-ov-state: valid route6: 2402:68c0:e000::/36 origin: AS137432 descr: MD Bahauddin Khan Shiddhirgonj, Power House mnt-by: MAINT-BKBNET-BD last-modified: 2020-05-23T23:54:13Z source: APNIC rpki-ov-state: valid route6: 2402:68c0:f000::/36 origin: AS137432 descr: MD Bahauddin Khan Shiddhirgonj, Power House mnt-by: MAINT-BKBNET-BD last-modified: 2020-05-23T23:54:44Z source: APNIC rpki-ov-state: valid