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, AS209242 members: AS394536, AS395747, AS14789 members: AS209103, AS139242, AS53667 members: AS-WIKIMEDIA, AS63018, AS36351 members: AS15299, AS55251, AS28695 members: AS11369, AS19225, AS-APRICOT members: AS38701, AS139648, AS6169 members: AS10584, AS10668, AS62371 members: AS137962, AS40144, AS135387 members: AS55532, AS201755, AS202595 members: AS45634, AS138341, AS131659 members: AS139811, AS26324, AS13461 members: AS262171, AS134145, AS208549 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: rir [at] cloudflare.com changed: rir [at] cloudflare.com 20200322 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: ****************************