Free Subnet Calculator from Solarwinds generates all subnets with real-time DNS, PING and CIDR tests. This networking tool performs DNS resolution, address translation, supports CIDR and Address Class information. It calculates subnets based on Subnet Mask, Mask Bits, Host Bits, Number of Subnets and Hosts per Subnet. It can even generate reports. The Advanced Subnet Calculator from SolarWinds is the industry leader and FREE.