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 tech-c: Zaid ALi mnt-by: MAINT-AS20049 changed: prkumar [at] linkedin.com 20190415 #22:16:43Z source: RADB as-set: AS-LINKEDIN descr: LinkedIn AS SET APAC country: SG members: AS13443 tech-c: ZA153-AP admin-c: ZA153-AP mnt-by: MAINT-SG-LINKEDIN mnt-lower: MAINT-SG-LINKEDIN changed: zali [at] linkedin.com 20140312 source: APNIC