These entries are queried from radb.net using whois, you can try my project getting these.
:AS-SUPRANET-CUSTOMERS as-set: AS-SUPRANET-CUSTOMERS descr: SupraNet Communications, Inc. members: AS5683, AS14305, AS32879 admin-c: STC1-ARIN tech-c: STC1-ARIN mnt-by: MNT-SUPN source: ARIN changed: colinb [at] supranet.net 20161114