These entries are queried from radb.net using whois, you can try my project getting these.
:AS53519 route: 206.208.200.0/21 descr: RR-RC-Central Maine Medical Center-Portland origin: AS53519 notify: publicipaddressing [at] charter.com mnt-by: MAINT-RR changed: publicipaddressing [at] charter.com 20181017 #22:02:30Z source: RADB last-modified: 2023-11-13T16:15:16Z rpki-ov-state: not_found # No ROAs found, or RPKI validation not enabled for source route: 206.208.204.0/24 descr: Proxy route object for Central Maine Medical Family origin: AS53519 admin-c: IA93-ARIN tech-c: IA93-ARIN notify: ip-admin [at] firstlight.net mnt-by: MAINT-SOVER-NOC changed: jhall [at] firstlight.net 20220715 source: RADB last-modified: 2023-11-13T16:11:46Z rpki-ov-state: not_found # No ROAs found, or RPKI validation not enabled for source route: 206.208.205.0/24 descr: Proxy route object for Central Maine Medical Family origin: AS53519 admin-c: IA93-ARIN tech-c: IA93-ARIN notify: ip-admin [at] firstlight.net mnt-by: MAINT-SOVER-NOC changed: jhall [at] firstlight.net 20220715 source: RADB last-modified: 2023-11-13T16:11:46Z rpki-ov-state: not_found # No ROAs found, or RPKI validation not enabled for source route: 206.208.206.0/24 descr: Proxy route object for Central Maine Medical Family origin: AS53519 admin-c: IA93-ARIN tech-c: IA93-ARIN notify: ip-admin [at] firstlight.net mnt-by: MAINT-SOVER-NOC changed: jhall [at] firstlight.net 20220715 source: RADB last-modified: 2023-11-13T16:11:46Z rpki-ov-state: not_found # No ROAs found, or RPKI validation not enabled for source route: 206.208.207.0/24 descr: Proxy route object for Central Maine Medical Family origin: AS53519 admin-c: IA93-ARIN tech-c: IA93-ARIN notify: ip-admin [at] firstlight.net mnt-by: MAINT-SOVER-NOC changed: jhall [at] firstlight.net 20220715 source: RADB last-modified: 2023-11-13T16:11:46Z rpki-ov-state: not_found # No ROAs found, or RPKI validation not enabled for source