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Nmap, short for Network Mapper, is an open-source tool used for network discovery and security auditing. It’s widely used by system administrators and cybersecurity professionals to scan IP addresses and ports in a network, and to detect installed applications and services. Here are some key features of Nmap:

Host Discovery: Identifies devices on a network, such as servers, routers, and switches.
Port Scanning: Enumerates open ports on target hosts.
Version Detection: Determines application names and versions on remote devices.
Operating System Detection: Infers the operating system and hardware characteristics of network devices.
Scriptable Interaction: Uses the Nmap Scripting Engine (NSE) for more advanced detection and exploitation capabilities.
Nmap is known for its flexibility and can be used for various tasks such as network inventory, maintenance, asset management, and vulnerability scanning. It also has a graphical user interface called Zenmap, which provides visual mappings of networks12.

For basic usage, here are a couple of common Nmap commands:

To scan a single host for well-known ports:
nmap scanme.nmap.org

To perform a stealth scan, which sends SYN packets and analyzes the responses without completing the TCP handshake:
nmap -sS scanme.nmap.org

Remember, while Nmap is a powerful tool, it should be used responsibly and legally, respecting all applicable laws and regulations

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