Nmap is a utility for network exploration or security auditing. Nmap 2.51 has been released, mostly to fix a target parsing bug found by Steve Horsburgh which could in some cases cause Nmap to crash with the error "Assertion 't->nleft > 1' failed". It supports ping scanning (determine which hosts are up), many port scanning techniques (determine what services the hosts are offering), and TCP/IP fingerprinting (remote host operating system identification). Nmap also offers flexible target and port specification, decoy scanning, determination of TCP sequence predictability characteristics, sunRPC scanning, reverse-identd scanning, and more.
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