These entries are queried from radb.net using whois, you can try my project getting these.
:AS-CLOUDFLARE as-set: AS-CLOUDFLARE descr: Cloudflare, Inc descr: 101 Townsend Street, San Francisco descr: California 94107, US descr: +1-650-319-8930 members: AS13335 members: AS3557, AS21556 members: AS132892, AS133877 members: AS202623, AS203898 members: AS394536, AS395747, AS14789 remarks: --------------- remarks: Cloudflare announces its ASNs via many upstream ASNs remarks: All Cloudflare abuse reporting can be done via remarks: https://www.cloudflare.com/abuse remarks: --------------- tech-c: DUMY-ARIN admin-c: DUMY-ARIN mnt-by: MNT-CLOUD14 notify: noc [at] cloudflare.com notify: rir [at] cloudflare.com changed: rir [at] cloudflare.com 20180504 source: ARIN remarks: **************************** remarks: * THIS OBJECT CONTAINS PLACEHOLDER DATA remarks: * Please note that all data that is generally regarded as personal remarks: * data has been removed from this object. remarks: * To view the original object, please query the ARIN Database at: remarks: * http://www.arin.net/whois remarks: ****************************