These entries are queried from radb.net using whois, you can try my project getting these.
:AS-LAYERSTACK as-set: AS-LAYERSTACK descr: Layerstack Ltd. tech-c: LLNA2-AP admin-c: LLNA2-AP mnt-by: MAINT-LAYER-HK members: AS133380 last-modified: 2021-01-11T18:23:09Z source: APNIC as-set: AS-LAYERSTACK descr: Layerstack members: AS133322 members: AS133380 members: AS55953 members: AS133905 members: AS135152 members: AS24549 members: AS132374 mbrs-by-ref: MAINT-AS133380 admin-c: Dennis Ng tech-c: Dennis Ng mnt-by: MAINT-AS133380 changed: dennis [at] layerstack.com 20200714 #12:12:27Z source: RADB last-modified: 2023-11-13T16:01:12Z