These entries are queried from radb.net using whois, you can try my project getting these.
:AS-SONA-V6 as-set: AS-SONA-V6 descr: Peering IPv6 ASN's of Sona Business B.V. members: AS60022 members: AS52249 members: AS208055 members: AS27762 tech-c: DUMY-RIPE admin-c: DUMY-RIPE mnt-by: SONA-MNT created: 2014-06-30T21:51:45Z last-modified: 2024-02-15T08:01:59Z 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-SONA-V6 descr: Peering IPv6 ASN's of Sona Business B.V. members: AS60022 members: AS27762 members: AS208055 members: AS52249 admin-c: SS25672-RIPE tech-c: SS25672-RIPE notify: support [at] sonabusiness.nl mnt-by: MAINT-AS60022 changed: support [at] sonabusiness.nl 20240215 # 0806Z source: RADB last-modified: 2024-02-15T08:06:40Z