These entries are queried from radb.net using whois, you can try my project getting these.
:AS-METAWEB-2 as-set: AS-METAWEB-2 descr: GOOGLE members: AS19527 members: AS26684 admin-c: Google Corp Network Operation tech-c: Google Corp Network Operation notify: ir-contact-netops-corp [at] google.com mnt-by: MAINT-AS15169 changed: raybennett [at] google.com 20180613 #15:29:12Z source: RADB last-modified: 2023-11-13T15:53:47Z