nmap is a free utility designed for a variety of customizable scans of IP networks with any number of objects, determining the status of objects on the scanned network (ports and their corresponding services). It was originally designed for UNIX systems, but versions for many operating systems are now available.
Nmap uses many different scanning methods, such as UDP, TCP (connect), TCP SYN (semi-open), FTP-proxy (ftp breakthrough), Reverse-ident, ICMP (ping), FIN, ACK, Xmas tree, SYN and NULL scans. Nmap also supports a big set of advanced features, such as detection of remote host operating system using TCP/IP stack fingerprinting, invisible scanning, dynamic packet latency and retry calculation, parallel scanning, inactive host detection by parallel ping, false host detection, packet filter detection, direct (without portmapper) RPC scanning, IP fragmentation scanning, and arbitrary
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