Nmap

Nmap 7.4

Free
An open source utility for network discovery and security auditing
4.2  (36 votes)
3.3
7.50 (See all)

Nmap (Network Mapper) is an open source utility for network discovery and security auditing. 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.

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