Nmap is a utility for network exploration or security auditing. It supports ping scanning , many port scanning techniques , and TCP/IP fingerprinting . Nmap also offers flexible target and port specification, decoy scanning, determination of TCP sequence predictability characteristics, reverse-identd scanning, and more. In addition to the classic command-line nmap executable, the Nmap suite includes a flexible data transfer, redirection, and debugging tool , a utility for comparing scan results , and a packet generation and response analysis tool .