These entries are queried from radb.net using whois, you can try my project getting these.
:AS32408 route: 66.252.128.0/20 origin: AS32408 descr: MNT-APTCL route 066.252.128.000/20 AS32408 member-of: RS-AECERO-SNA1-DS,AS32408:RS-CLIENTS admin-c: ROBIC-ARIN tech-c: JONES38-ARIN tech-c: TECHP4-ARIN mnt-by: MNT-APTCL created: 2020-08-13T17:35:25Z last-modified: 2021-03-20T06:54:47Z source: ARIN rpki-ov-state: not_found # No ROAs found, or RPKI validation not enabled for source route: 199.59.248.0/21 origin: AS32408 descr: MNT-SC-106 route 199.059.248.000/21 AS32408 member-of: RS-AECERO-SNA1,AS32408:RS-AECERO admin-c: ADMIN1186-ARIN tech-c: TECHP4-ARIN mnt-by: MNT-SC-106 created: 2020-08-13T17:34:58Z last-modified: 2021-02-04T23:41:41Z source: ARIN rpki-ov-state: not_found # No ROAs found, or RPKI validation not enabled for source route: 206.208.112.0/21 origin: AS32408 descr: MNT-SC-106 route 206.208.112.000/21 AS32408 member-of: RS-AECERO-SNA1,AS32408:RS-AECERO admin-c: ADMIN1186-ARIN tech-c: TECHP4-ARIN mnt-by: MNT-SC-106 created: 2020-08-13T17:34:34Z last-modified: 2021-02-04T23:41:54Z source: ARIN rpki-ov-state: not_found # No ROAs found, or RPKI validation not enabled for source route: 208.87.16.0/22 origin: AS32408 descr: MNT-SC-106 route 208.087.016.000/22 AS32408 member-of: RS-AECERO-SNA1,AS32408:RS-AECERO admin-c: ADMIN1186-ARIN tech-c: TECHP4-ARIN mnt-by: MNT-SC-106 created: 2020-08-13T17:34:04Z last-modified: 2021-02-04T23:42:11Z source: ARIN rpki-ov-state: not_found # No ROAs found, or RPKI validation not enabled for source route6: 2605:7880::/32 origin: AS32408 descr: Aecero IPv6 member-of: AS32408:RS-AECERO admin-c: ADMIN1186-ARIN tech-c: TECHP4-ARIN mnt-by: MNT-SC-106 created: 2021-02-04T23:47:04Z last-modified: 2021-02-04T23:47:04Z source: ARIN rpki-ov-state: not_found # No ROAs found, or RPKI validation not enabled for source