nmap是一个网络连接端扫描软件，用来扫描网上电脑开放的网络连接端。确定哪些服务运行在哪些连接端，并且推断计算机运行哪个操作系统。它是网络管理员必用的软件之一，以及用以评估网络系统安全。-Nmap is a network connection scanning software, used to scan the network computer open network connection. Determine which services run on which endpoints, and infer which operating system the computer is running (this is also known as fingerprinting). It is one of the software that network administrators must use, as well as to assess network system security.