These entries are queried from radb.net using whois, you can try my project getting these.
:AS15428 route: 31.148.112.0/21 descr: DAGNET origin: AS15428 mnt-by: MNT-DAGNET created: 2014-05-05T16:17:08Z last-modified: 2014-05-05T16:17:08Z 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 route: 146.158.95.0/24 origin: AS15428 mnt-by: RIPE-DB-MNT created: 2023-09-18T13:15:59Z last-modified: 2023-09-18T13:15:59Z 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 route: 178.213.24.0/21 descr: DAGNET origin: AS15428 mnt-by: MNT-DAGNET created: 2010-09-15T09:08:47Z last-modified: 2010-09-15T09:08:47Z 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: not_found # No ROAs found, or RPKI validation not enabled for source route: 193.33.88.0/23 descr: DAGNET origin: AS15428 mnt-by: MNT-DAGNET created: 2008-10-24T17:05:15Z last-modified: 2015-09-24T10:05:17Z 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: not_found # No ROAs found, or RPKI validation not enabled for source route: 194.1.248.0/22 descr: DAGNET origin: AS15428 mnt-by: MNT-DAGNET created: 2012-03-05T14:05:11Z last-modified: 2012-03-05T14:08:36Z 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: not_found # No ROAs found, or RPKI validation not enabled for source