These entries are queried from radb.net using whois, you can try my project getting these.
:AS-CTSD as-set: AS-CTSD descr: ASes within CT Shandong Province members: AS17633 members: AS58540,AS58541,AS136195,AS137690,AS139887 members: AS59009,AS63549,AS37963,AS131519,AS139154 mnt-by: MAINT-AS58540 changed: 18953197371 [at] chinatelecom.cn 20211205 #02:41:08Z source: RADB last-modified: 2023-11-13T16:09:02Z