BGP figure out networks belonging to AS

BGP List prefixes

To list all prefixes originated on AS1759 against the Routing Assets Database (RADb), issue the command below.

whois -h whois.radb.net -- '-i origin AS1759' | grep -Eo "(route:|route6:).*"
route:      139.157.0.0/16
route:      147.44.0.0/16
route:          193.178.133.0/24
....
route6:         2001:2003::/32
route6:         2a00:8a00:4000::/35
route6:         2a03:62a0:3501::/48

Thanks to this Link: https://www.noction.com/knowledge-base/bgp-filtering