These entries are queried from radb.net using whois, you can try my project getting these.
:AS32121 route: 142.152.0.0/19 origin: AS32121 descr: TRANSALTA CORPORATION remarks: Proxy route entry added on behalf of TRANSALTA CORPORATION originating in AS32121 mnt-by: MAINT-AS852 changed: david.bovas [at] telus.com 20210209 #04:37:55Z source: RADB last-modified: 2023-11-13T16:03:37Z rpki-ov-state: not_found # No ROAs found, or RPKI validation not enabled for source route: 142.152.62.0/24 origin: AS32121 descr: TRANSALTA CORPORATION remarks: Proxy route entry added on behalf of TRANSALTA CORPORATION originating in AS32121 mnt-by: MAINT-AS852 changed: david.bovas [at] telus.com 20210209 #04:39:18Z source: RADB last-modified: 2023-11-13T16:03:37Z rpki-ov-state: not_found # No ROAs found, or RPKI validation not enabled for source route: 142.152.64.0/24 descr: TRANSALTA CORPORATION origin: AS32121 remarks: Proxy route entry added on behalf of remarks: TRANSALTA CORPORATION remarks: originating in AS32121 mnt-by: MAINT-AS852 changed: abuse [at] telus.com 20230331 source: RADB last-modified: 2023-11-13T16:15:39Z rpki-ov-state: not_found # No ROAs found, or RPKI validation not enabled for source route: 142.152.96.0/19 origin: AS32121 descr: TransAlta Utilities Corporation remarks: Proxy route entry added on behalf of TransAlta Corporation originating in AS32121 mnt-by: MAINT-AS852 changed: matthew.wilder [at] telus.com 20240426 # 0024Z source: RADB last-modified: 2024-04-26T00:24:01Z rpki-ov-state: not_found # No ROAs found, or RPKI validation not enabled for source route: 142.152.96.0/23 origin: AS32121 descr: Transalta remarks: Added on behalf of Transalta mnt-by: MAINT-AS852 changed: matthew.wilder [at] telus.com 20221114 #15:28:57Z source: RADB last-modified: 2023-11-13T16:13:07Z rpki-ov-state: not_found # No ROAs found, or RPKI validation not enabled for source route: 142.152.128.0/19 origin: AS32121 descr: TransAlta Utilities Corporation remarks: Proxy route entry added on behalf of TransAlta Corporation originating in AS32121 mnt-by: MAINT-AS852 changed: matthew.wilder [at] telus.com 20240426 # 0024Z source: RADB last-modified: 2024-04-26T00:24:43Z rpki-ov-state: not_found # No ROAs found, or RPKI validation not enabled for source route: 142.152.160.0/19 origin: AS32121 descr: TransAlta Utilities Corporation remarks: Proxy route entry added on behalf of TransAlta Corporation originating in AS32121 mnt-by: MAINT-AS852 changed: matthew.wilder [at] telus.com 20240426 # 0025Z source: RADB last-modified: 2024-04-26T00:25:19Z rpki-ov-state: not_found # No ROAs found, or RPKI validation not enabled for source route: 142.152.162.0/24 origin: AS32121 descr: TRANSALTA CORPORATION remarks: Proxy route entry added on behalf of TRANSALTA CORPORATION originating in AS32121 mnt-by: MAINT-AS852 changed: david.bovas [at] telus.com 20210209 #04:40:46Z source: RADB last-modified: 2023-11-13T16:03:37Z rpki-ov-state: not_found # No ROAs found, or RPKI validation not enabled for source