These entries are queried from radb.net using whois, you can try my project getting these.
:AS137540 route: 103.112.147.0/24 origin: AS137540 descr: Bangladesh Roads and Highways Department Roads and Highways Department Sarak Bhaban Tejgaon, Dhaka mnt-by: MAINT-RHD-BD last-modified: 2018-04-10T07:54:55Z source: APNIC rpki-ov-state: valid