These entries are queried from radb.net using whois, you can try my project getting these.
:AS-MZIMA-BACKBONE as-set: AS-MZIMA-BACKBONE descr: Mzima Backbone Network members: AS25973 admin-c: MZIMA-NETOPS tech-c: MZIMA-NETOPS notify: netops [at] mzima.net mnt-by: MAINT-AS3257 changed: netops [at] mzima.net 20070429 #05:44:38(UTC) changed: netguard [at] gtt.net 20181101 source: RADB last-modified: 2023-11-13T15:55:00Z