Need Irule to block traffic from certain IPs

Here is one example that only allows specific IP's/networks

when CLIENT_ACCEPTED { set clientip [IP::client_addr] if { not ( [class match [IP::client_addr] equals Customer_Allowed_IP] ) } { reject log local0. "Client Source IP: $clientip has been denied access to: [IP::local_addr]:[TCP::local_port]" } }