These entries are queried from radb.net using whois, you can try my project getting these.
:AS-RCN as-set: AS-RCN descr: Macro for RCN ASNs members: AS-RCN-BACKBONE,AS-RCN-LEGACY,AS-RCN-CUSTOMER tech-c: JZP admin-c: JZP notify: peering [at] rcn.com mnt-by: MAINT-AS6079 changed: jprovo [at] ultra.net 19990505 source: RADB last-modified: 2023-11-13T15:39:32Z