These entries are queried from radb.net using whois, you can try my project getting these.
:AS13266 route: 141.176.0.0/16 descr: Port of Rotterdam network descr: Rotterdam, the Netherlands origin: AS13266 mnt-by: EASYNET-NL-MNT created: 1970-01-01T00:00:00Z last-modified: 2012-12-10T10:52:59Z 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: not_found # No ROAs found, or RPKI validation not enabled for source route: 141.176.38.0/24 descr: Port of Rotterdam network descr: Rotterdam, the Netherlands origin: AS13266 mnt-by: EASYNET-NL-MNT created: 2021-04-22T12:32:55Z last-modified: 2021-04-22T12:32:55Z 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: 141.176.52.0/22 descr: Port of Rotterdam network descr: Rotterdam, the Netherlands origin: AS13266 mnt-by: EASYNET-NL-MNT created: 2021-04-22T12:32:55Z last-modified: 2021-04-22T12:32:55Z 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: 141.176.60.0/24 descr: Port of Rotterdam network descr: Rotterdam, the Netherlands origin: AS13266 mnt-by: EASYNET-NL-MNT created: 2021-04-22T12:32:55Z last-modified: 2021-04-22T12:32:55Z 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: 141.176.61.0/24 descr: Port of Rotterdam network descr: Rotterdam, the Netherlands origin: AS13266 mnt-by: EASYNET-NL-MNT created: 2021-04-22T12:32:55Z last-modified: 2021-04-22T12:32:55Z 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