These entries are queried from radb.net using whois, you can try my project getting these.
:AS141773 route: 103.163.210.0/23 descr: Bangladesh Data Center Company Limited (BDCCL) country: BD mnt-by: MAINT-BDCCL-BD origin: AS141773 last-modified: 2021-04-11T07:36:40Z source: APNIC rpki-ov-state: valid route: 103.163.210.0/24 descr: Bangladesh Data Center Company Limited (BDCCL) country: BD mnt-by: MAINT-BDCCL-BD origin: AS141773 last-modified: 2021-04-11T07:37:44Z source: APNIC rpki-ov-state: valid route: 103.163.211.0/24 descr: Bangladesh Data Center Company Limited (BDCCL) country: BD mnt-by: MAINT-BDCCL-BD origin: AS141773 last-modified: 2021-04-11T07:38:56Z source: APNIC rpki-ov-state: valid route: 203.112.220.0/23 origin: AS141773 descr: Bangladesh Telegraph & Telephone Board Telejogajog Bhaban 37/E, Eskaton Garden mnt-by: MAINT-BD-BTTB last-modified: 2021-04-11T09:13:42Z source: APNIC rpki-ov-state: valid route: 203.112.220.0/24 origin: AS141773 descr: Bangladesh Telegraph & Telephone Board Telejogajog Bhaban 37/E, Eskaton Garden mnt-by: MAINT-BD-BTTB last-modified: 2021-04-11T09:13:44Z source: APNIC rpki-ov-state: valid route: 203.112.221.0/24 origin: AS141773 descr: Bangladesh Telegraph & Telephone Board Telejogajog Bhaban 37/E, Eskaton Garden mnt-by: MAINT-BD-BTTB last-modified: 2021-04-11T09:13:46Z source: APNIC rpki-ov-state: valid route6: 2001:df6:2780::/48 descr: Bangladesh Data Center Company Limited country: BD mnt-by: MAINT-BDCCL-BD origin: AS141773 last-modified: 2021-05-19T08:57:55Z mnt-routes: MAINT-BDCCL-BD source: APNIC rpki-ov-state: valid