Sorry but it's been a few years so any questions beyond CIDR support is best asked of its maker.
...with the capability to block incoming connections by IP address, IP range, or if I desire it, by CIDR.
Are there any existing Windows firewalls that can block by IP address? I am currently using Comodo but do not see this capability in it.
Assume that I have a reason for this so you wont have to waste bandwidth asking what I want it for as your sole reply.
I may go outside the Windows OS and build a SmoothWall firewall box if nothing appears to cover what I want under Windows.