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 members: AS53135,AS268848,AS263380 members: AS28260 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 20200406 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: ****************************