These entries are queried from radb.net using whois, you can try my project getting these.
:AS-LINKEDIN as-set: AS-LINKEDIN descr: LinkedIn Global AS-SET members: AS20049, AS40793, AS20366, AS197612, AS55163, AS14413 members: AS132406 members: AS13443 members: AS30427 admin-c: Zaid Ali admin-c: Prashanth Kumar tech-c: Zaid ALi tech-c: Prashanth Kumar mnt-by: MAINT-AS20049 changed: dzimmerman [at] linkedin.com 20210629 #22:43:55Z source: RADB as-set: AS-LINKEDIN descr: LinkedIn AS SET APAC country: SG members: AS13443 tech-c: ZA153-AP admin-c: ZA153-AP admin-c: PK601-AP mnt-by: MAINT-SG-LINKEDIN mnt-lower: MAINT-SG-LINKEDIN last-modified: 2021-11-05T21:06:55Z source: APNIC