ipcalc - IP Calculator. ipcalc takes an IP address and netmask and calculates the resulting broadcast, network, Cisco wildcard mask, and host range. By giving a second netmask, you can design subnets and supernets....
whatmask - Whatmask is a small C program that will help you with network settings and subnet calculations.
LanCalculator - LanCalculator - IP Subnet Calculator for IPv4/IPv6 Networks - LizardSystems
Dipiscan - Présentation et téléchargement de logiciels en freeware pour Windows, développés par Damien PONNELLE
Port Authority - A handy systems and security-focused tool, Port Authority is a very fast Android port scanner.
Angry IP Scanner - Open-source and cross-platform network scanner designed to be fast and simple to use