Nmap is a security scanner originally written by Gordon Lyon (Fyodor). It may be used to discover computers and services on a computer network, thus creating a map of the network. Just like many simpl... More

Nmap is a security scanner originally written by Gordon Lyon (Fyodor). It may be used to discover computers and services on a computer network, thus creating a map of the network. Just like many simple port scanners, Nmap is capable of discovering passive services on a network despite the fact that such services aren't advertising themselves with a service discovery protocol. In addition Nmap may be able to determine various details about the remote computers. These include operating system, device type, uptime, software product used to run a service, exact version number of that product, presence of some firewall techniques and, on a local area network, even vendor of the remote network card.Nmap runs on Unix-like systems such as Linux, Solaris, Mac OS X, and BSD, and also on Microsoft Windows and AmigaOS.  [edit]  Less