These entries are queried from radb.net using whois, you can try my project getting these.
:AS-AMAZON-NA as-set: AS-AMAZON-NA descr: Amazon NA ASNs members: AS16509,AS7224,AS14618,AS8987,AS62785,AS19047 admin-c: AC6-ORG-ARIN tech-c: AC6-ORG-ARIN notify: noc [at] amazon.com mnt-by: MAINT-AS16509 changed: noc [at] amazon.com 20190429 #23:59:48Z source: RADB last-modified: 2023-11-13T15:56:05Z