These entries are queried from radb.net using whois, you can try my project getting these.
:AS-DIGITALOCEAN as-set: AS-DIGITALOCEAN descr: DigitalOcean AS Macro members: AS14061 members: AS46652 changed: luca [at] digitalocean.com 20181213 #14:53:35Z source: RADB mnt-by: MAINT-AS14061