These entries are queried from radb.net using whois, you can try my project getting these.
:AS-YAHOO as-set: AS-YAHOO descr: Yahoo ASNs to accept routes from members: AS1668, AS5779, AS7233, AS7280, AS10229, AS10230 members: AS10310, AS10467, AS10880, AS13533, AS14196, AS14210, AS14678, AS14776 members: AS14777, AS14778, AS14779, AS14780, AS14781, AS15635, AS15896 members: AS16515, AS17110, AS17457, AS18293, AS22565 members: AS23879, AS23880, AS23926, AS24018, AS24031, AS24236, AS24376 members: AS24506, AS26085, AS26101, AS26316, AS28122, AS32116 members: AS32345, AS34010, AS34082, AS36088, AS36129, AS36229 members: AS36646, AS36647, AS36752, AS38032, AS38033, AS38045 members: AS38072, AS38689, AS39995, AS40986, AS42173, AS43428, AS45501 members: AS55416, AS55417, AS55418, AS55517, AS56173, AS58525, AS134706 members: AS203070, AS203219, AS203220, AS204000, AS393245, AS394340 members: AS394560, AS394561 remarks: Yahoo Global ASs tech-c: Yahoo Network admin-c: Yahoo Network notify: network [at] yahoo-inc.com mnt-by: MAINT-YAHOO changed: jasonroh [at] verizonmedia.com 20200206 source: RADB as-set: AS-YAHOO descr: Yahoo ASNs to accept routes from members: AS10310, AS26085, AS26101, AS7233, AS5779, AS14776, AS14778, as-yahoo remarks: Level3 members: AS5779 RADB::AS10310 RADB::AS7233 RADB::AS26085 RADB::AS26101 remarks: Level3 members: RADB::AS14776 RADB::AS-yahoo RADB::AS14778 tech-c: AB474-ARIN mnt-by: YAHOO-MNT changed: scordova [at] level3.net 20060301 source: LEVEL3