I think everyone has heard of this one, recently evolved into the 4.x series.
Nmap (“Network Mapper”) is a free 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 (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. Nmap runs on most types of computers and both console and graphical versions are available. Nmap is free and open source.
Can be used by beginners (-sT) or by pros alike (–packet_trace). A very versatile tool, once you fully understand the results.
Get Nmap Here
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