WildPackets IP Subnet Calculator (Windows) - Download & Review
Software & Windows Solutions - Subnet and IP Calculator One of the most important tools in the belt of a junior network engineer is an IP network calculator. These can be used
Free CertificationKits CCNA Subnet Calculator
Subnet Calculator for IP Addresses and Subnetting ONLINE!
Guide to Subnet Mask (Subnetting) & IP Subnet Calculator
NetCalculator - CodeProject
FREE: SolarWinds Advanced Subnet Calculator – IP subnet calculation made easy – 4sysops