These entries are queried from radb.net using whois, you can try my project getting these.
:AS139771 route: 103.145.28.0/24 descr: Alpha Networks Limited origin: AS139771 mnt-by: MAINT-ALPHA-BD last-modified: 2019-12-07T19:24:59Z country: BD source: APNIC rpki-ov-state: valid route: 103.145.29.0/24 descr: Alpha Networks Limited origin: AS139771 mnt-by: MAINT-ALPHA-BD last-modified: 2019-12-07T19:25:40Z country: BD source: APNIC rpki-ov-state: valid route6: 2001:df1:f180::/48 origin: AS139771 descr: Md. Irfan Uddin Symoon 1st Floor, CDA Market, Kazir Dewri, Chattaogram mnt-by: MAINT-ALPHA-BD last-modified: 2020-12-25T12:35:15Z source: APNIC rpki-ov-state: valid