These entries are queried from radb.net using whois, you can try my project getting these.
:AS-CTBC-CUSTOMERS50 as-set: AS-CTBC-CUSTOMERS50 descr: 50 customer ASes in each as-set members: AS265083,AS53178,AS268282,AS264988,AS266947,AS19773,AS529853,AS267131,AS267137,AS265329,AS268255,AS267675,AS265007,AS263118,AS266530,AS266939,AS267270,AS267194,AS264770,AS266805,AS264565,AS265731,AS262720,AS263978,AS263135,AS264316,AS53054,AS264911,AS268291,AS28592,AS267226,AS266472,AS262905,AS264931,AS52637,AS265013,AS263631,AS267346,AS268305,AS267299,AS267251,AS267322,AS266389,AS264322,AS266158,AS263152,AS267263,AS266357,AS268300,AS263347,AS264424,AS61659 remarks: 50 customer ASes in each as-set mnt-by: MAINT-AS16735 changed: jonathanf [at] algartelecom.com.br 20180624 #01:24:47Z source: RADB last-modified: 2023-11-13T15:54:00Z