These entries are queried from radb.net using whois, you can try my project getting these.
:AS273021 route: 38.51.18.0/23 origin: AS273021 descr: ARK-NET DOA S.R.L. member-of: RS-AS273021-ARK-NET-DOA mnt-by: MAINT-AS266687 changed: dpecile [at] sietecapas.com.ar 20231114 source: ALTDB rpki-ov-state: not_found # No ROAs found, or RPKI validation not enabled for source route: 38.51.18.0/24 origin: AS273021 descr: ARK-NET DOA S.R.L. member-of: RS-AS273021-ARK-NET-DOA mnt-by: MAINT-AS266687 changed: dpecile [at] sietecapas.com.ar 20231114 source: ALTDB rpki-ov-state: not_found # No ROAs found, or RPKI validation not enabled for source route: 38.51.19.0/24 origin: AS273021 descr: ARK-NET DOA S.R.L. member-of: RS-AS273021-ARK-NET-DOA mnt-by: MAINT-AS266687 changed: dpecile [at] sietecapas.com.ar 20231114 source: ALTDB rpki-ov-state: not_found # No ROAs found, or RPKI validation not enabled for source route6: 2803:9390::/32 descr: LACNIC generated route6 for ARK-NET DOA S.R.L. origin: AS273021 remarks: LACNIC generated route6 for ARK-NET DOA S.R.L. remarks: maxLength 48 mnt-by: MNT-AR-ARSR20-LACNIC changed: -doa.com.ar 20240308 source: LACNIC remarks: *************************************************** remarks: This object may have been modified remarks: For more information, please query whois.lacnic.net remarks: *************************************************** last-modified: 2024-03-08T15:00:06Z rpki-ov-state: valid