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http://nmap.org/press/SANS_ID_Faq_What_Is_Nmap.html

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Posted by crouse

Nmap does port scanning in two distinct steps: host discovery
If you frequently run nmap scans, be prepared to answer questions from your ISP (Internet Service Provider). Some ISPs routinely look for nmap traffic,

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Posted by waqasahmad

http://netsecurity.about.com/od/securitytoolprofiles/p/aaprnmap.htm

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Posted by michaelcoyne

Nmap is a security scanner originally written by Gordon Lyon (also known by his pseudonym Fyodor Vaskovich). 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 Linux, Microsoft Windows, Solaris, and BSD (including Mac OS X), and also on AmigaOS. Linux is the most popular nmap platform and Windows the second most popular.

Please visit the following link for more information:

http://nmap.org/press/SANS_ID_Faq_What_Is_Nmap.html

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Posted by sagitraz