1)   Advanced Subnet Calculator 9.1
Free Subnet Calculator tool from SolarWinds generates all subnets with real-time DNS, PING and CIDR tests. This application provides address details, a classful subnet creator, a CIDR calculator and subnet address lists that can be exported.

 2)   Tech-FAQ.com Subnet Calculator 1.0
Subnet calculator for Microsoft Windows with support for CIDR (Classless Internet Domain Routing) and wildcard masks.