These entries are queried from radb.net using whois, you can try my project getting these.
:AS-RINGCENTRAL as-set: AS-RINGCENTRAL descr: RingCentral, Inc. members: AS40627 mnt-by: MAINT-AS40627 changed: john.chong [at] ringcentral.com 20170524 #19:42:00Z source: RADB last-modified: 2023-11-13T15:51:12Z