These entries are queried from radb.net using whois, you can try my project getting these.
:AS-IMFNETWORK as-set: AS-IMFNETWORK descr: IMF NETWORK AS-SET members: AS263541 members: AS-IMFNETWORK-CUSTOMERS admin-c: IMF23-NICBR tech-c: IMF23-NICBR notify: noc [at] imfnetwork.com.br mnt-by: MAINT-AS263541 changed: noc [at] imfnetwork.com.br 20191122 source: TC