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Nmap
Network Mapper is a security scanner, used to discover hosts and services on a computer network, therefore building a "map" of the network. It can be used to test security, to identify the OS and applications, to determine the type of firewall.
| First released | 1997 |
| Developed by | Gordon Lyon |
| Latest stable version | Nmap 7 |
| Open-source | Yes |
| Used by | Samsung, Google, Amazon |