These entries are queried from radb.net using whois, you can try my project getting these.
:AS-YANDEX as-set: AS-YANDEX descr: Yandex and relatives members: AS13238 members: AS20144 tech-c: DUMY-RIPE admin-c: DUMY-RIPE mnt-by: YANDEX-MNT created: 2004-07-13T14:54:41Z last-modified: 2020-07-03T18:07:17Z source: RIPE remarks: **************************** remarks: * THIS OBJECT IS MODIFIED 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 RIPE Database at: remarks: * http://www.ripe.net/whois remarks: **************************** as-set: AS-YANDEX descr: Yandex and relatives members: AS13238 members: AS20144 members: AS43247 tech-c: YNO2-ARIN admin-c: YNO2-ARIN mnt-by: MNT-YANDE changed: karyakin [at] yandex-team.ru 20191010 source: ARIN