Nmap for USB
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Nmap is a free open source tool used for network exploration and vulnerability auditing. Using Nmap a user can quickly scan large networks as well as target specific hosts. Nmap uses IP packets in unique ways to figure ouw what hosts are available on a given network and can determine what operating system it is running as well as determine what services (including versions) it is running and can also discover what type of packet filters and firewalls are in use. Recent versions have been modified to run straight from a USB flash drive