Nmap
(ver 5.35DC1)
Freeware


Nmap is a Network Mapper for network discovery and 
security auditing. Nmap is a command line utility, 
but can be run through the included graphical 
interface "Zenmap".  Nmap uses raw IP packets in 
novel ways to determine what hosts are available on 
the network, what services (application name and 
version) those hosts are offering, what operating 
systems (and OS versions) they are running, what 
type of packet filters/firewalls are in use, and 
dozens of other characteristics. It was designed to 
rapidly scan large networks, but works fine against 
single hosts.  


NOTE: This is the last version compatible with 
	Windows 2000 (newer versions are compatible 
	if you compile them yourself, rather than 
	using a pre-compiled "setup" version).