These entries are queried from radb.net using whois, you can try my project getting these.
:AS62785 route: 172.96.96.0/20 descr: AMAZON origin: AS62785 mnt-by: DE-COLT-MNT created: 2017-02-08T08:45:14Z last-modified: 2018-09-04T18:41:46Z source: RIPE-NONAUTH 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: valid route: 172.96.96.0/20 descr: Amazon FC origin: AS62785 mnt-by: MAINT-AS16509 changed: noc [at] amazon.com 20151016 #12:52:14Z source: RADB last-modified: 2023-11-13T15:48:10Z rpki-ov-state: valid route: 172.96.97.0/24 descr: Amazon FC Prefix origin: AS62785 mnt-by: MAINT-AS16509 changed: noc [at] amazon.com 20151027 #17:50:54Z source: RADB last-modified: 2023-11-13T15:48:25Z rpki-ov-state: valid route: 172.96.98.0/24 descr: Amazon FC Prefix origin: AS62785 mnt-by: MAINT-AS16509 changed: noc [at] amazon.com 20170202 #19:11:08Z source: RADB last-modified: 2023-11-13T15:50:36Z rpki-ov-state: valid route: 172.96.99.0/24 descr: Amazon FC Prefix origin: AS62785 mnt-by: MAINT-AS16509 changed: noc [at] amazon.com 20171219 #16:53:05Z source: RADB last-modified: 2023-11-13T15:52:37Z rpki-ov-state: valid route: 172.96.100.0/24 descr: Amazon FC Prefix origin: AS62785 mnt-by: MAINT-AS16509 changed: noc [at] amazon.com 20171219 #16:54:10Z source: RADB last-modified: 2023-11-13T15:52:37Z rpki-ov-state: valid route: 172.96.101.0/24 descr: Amazon FC Prefix origin: AS62785 mnt-by: MAINT-AS16509 changed: noc [at] amazon.com 20171219 #16:55:05Z source: RADB last-modified: 2023-11-13T15:52:37Z rpki-ov-state: valid route: 173.83.0.0/16 origin: AS62785 descr: Amazon prefix mnt-by: MAINT-AS16509 changed: noc [at] amazon.com 20220930 #13:58:40Z source: RADB last-modified: 2023-11-13T16:12:32Z rpki-ov-state: valid