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What is Nmap?: Nmap, short for "network mapper", is a free utility which can quickly scan broad ranges of devices and provide valuable information about the devices on your network. It can be used for IT auditing and asset discovery as well as for security profiling of the network.
What Does Nmap Do?: Nmap uses raw IP packets to determine what hosts are available on the network, the services that are enabled, the operating system and version of the host, what sort of firewall or packet filters are in place and many other aspects of the network. The information can be used to proactively identify and correct security holes. The tool can also be used by attackers to scan a network and perform reconnaisance about the types and quantities of targets available and what weaknesses exist.
Running Nmap: Nmap is available for a wide range of operating system platforms. The standard download is a compressed file containing the UNIX version (which runs on Linux, Solaris, Free/Net/OpenBSD, and Mac OS X) and the Windows version as well as NmapFE, the X-Windows front end for UNIX, and NmapWIN, the recommended Windows GUI for Nmap.
NMap Scans: NMap can perform a wide range of scans. Some are more aggressive and blatant, while some are designed to be stealthy and scan undetected. Depending on the type of scan performed, different information can be discovered as well. You can download the latest version of Nmap, as well as many previous stable versions, at Nmap Downloads
Some of the scan types are:
- Connect
- SYN Stealth
- FIN, Xmas, Null
- Ping
- UDP Scan
- IP Protocol Scan
- ACK Scan
- Window Scan
- RPC Scan
- List Scan
- FTP Bounce
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