These entries are queried from radb.net using whois, you can try my project getting these.
:AS141236 route: 103.157.0.0/23 origin: AS141236 descr: Mandalay City Development Committee Mandalay City Development Committee 26 St, Chanayetharsan Township , Mandalay mnt-by: MAINT-MCDC-MM last-modified: 2021-10-27T08:09:18Z source: APNIC rpki-ov-state: valid route: 103.157.0.0/24 descr: Customer MPT origin: AS141236 mnt-by: MAINT-AS38082 changed: irradmin [at] irr.trueintergateway.com 20201015 source: RADB last-modified: 2023-11-13T16:02:39Z rpki-ov-state: valid route: 103.157.0.0/24 origin: AS141236 descr: Mandalay City Development Committee Mandalay City Development Committee 26 St, Chanayetharsan Township , Mandalay mnt-by: MAINT-MCDC-MM last-modified: 2020-10-07T14:23:38Z source: APNIC rpki-ov-state: valid route: 103.157.1.0/24 descr: Customer MPT origin: AS141236 mnt-by: MAINT-AS38082 changed: irradmin [at] irr.trueintergateway.com 20201015 source: RADB last-modified: 2023-11-13T16:02:39Z rpki-ov-state: valid route: 103.157.1.0/24 origin: AS141236 descr: Mandalay City Development Committee Mandalay City Development Committee 26 St, Chanayetharsan Township , Mandalay mnt-by: MAINT-MCDC-MM last-modified: 2020-10-07T14:24:01Z source: APNIC rpki-ov-state: valid