These entries are queried from radb.net using whois, you can try my project getting these.
:AS135412 route: 203.119.78.0/24 origin: AS135412 descr: Singapore Network Information Centre 10 Pasir Panjang Road #03-01 Mapletree Business City mnt-by: MAINT-SGNIC-SG last-modified: 2019-12-12T02:41:10Z source: APNIC rpki-ov-state: valid