NMAP free network security utlity
Russell McMahon email (remove spam text)
Nmap ("Network Mapper") is an open source utility for network exploration or
security auditing. It was designed to rapidly scan large networks, although
it works fine against single hosts.
Nmap uses raw IP packets in novel ways to determine what hosts are available
on the network, what services (ports) they are offering, what operating
system (and OS version) they are running, what type of packet
filters/firewalls are in use, and dozens of other characteristics. Nmap runs
on most types of computers, and both console and graphical versions are
available. Nmap is free software, available with full source code under the
terms of the GNU GPL.
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