whatmask - Whatmask is a small C program that will help you with network settings and subnet calculations.
Dipiscan - Présentation et téléchargement de logiciels en freeware pour Windows, développés par Damien PONNELLE
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....
Advanced Port Scanner - Advanced Port Scanner is a fast and free software for port scanning.
Subnetter - Split IPv4 network ranges
Port Authority - A handy systems and security-focused tool, Port Authority is a very fast Android port scanner.