These entries are queried from radb.net using whois, you can try my project getting these.
:AS57990 route: 176.112.160.0/21 descr: route1 origin: AS57990 mnt-by: ALIEVMA-MNT created: 2021-06-17T07:51:56Z last-modified: 2021-06-17T07:51:56Z source: RIPE remarks: **************************** remarks: * THIS OBJECT IS MODIFIED remarks: * Please note that all data that is generally regarded as personal remarks: * data has been removed from this object. remarks: * To view the original object, please query the RIPE Database at: remarks: * http://www.ripe.net/whois remarks: **************************** rpki-ov-state: valid