These entries are queried from radb.net using whois, you can try my project getting these.
:AS132339 route: 103.12.247.0/24 descr: Route Prefix For SG Advertisement origin: AS132339 country: BD mnt-lower: MAINT-CELTELECOM1-IGW-BD mnt-routes: MAINT-CELTELECOM1-IGW-BD mnt-by: MAINT-CELTELECOM1-IGW-BD last-modified: 2016-03-11T04:39:00Z source: APNIC rpki-ov-state: valid