Yes you can.
But you must use an IPRange list.
I have rules like this:
And the IPRange list looks like this:
And when you need a single IP, just enter like this:
My recommendtation is to always use the IPRange list over the IP list when possible.
Yes, that worked. I created a new rule. I called it "Client IP in Range in Allowed Client IPs" so then the rule automatically created the link to the "Allowed Client IPs" list. Property is Client.IP, Operator "is in range list", Operand is "Allowed Client IPs" and the Action is Stop Cycle. Worked perfectly. Thanks.