These entries are queried from radb.net using whois, you can try my project getting these.
:AS139913 route: 103.147.28.0/23 origin: AS139913 descr: First Security Islami Bank Limited Plot#12, Block#A, Main Road, Bashundhara C/A, Dhaka. mnt-by: MAINT-FSIBL-BD last-modified: 2019-12-30T06:09:14Z source: APNIC rpki-ov-state: valid route: 103.147.28.0/24 origin: AS139913 descr: First Security Islami Bank Limited Plot#12, Block#A, Main Road, Bashundhara C/A, Dhaka. mnt-by: MAINT-FSIBL-BD last-modified: 2019-12-30T06:15:03Z source: APNIC rpki-ov-state: valid route: 103.147.29.0/24 origin: AS139913 descr: First Security Islami Bank Limited Plot#12, Block#A, Main Road, Bashundhara C/A, Dhaka. mnt-by: MAINT-FSIBL-BD last-modified: 2019-12-30T06:15:03Z source: APNIC rpki-ov-state: valid