扫描TCP端口是入侵者搜集目标主机开放端口的常用手法之一，而多线程的扫描能大大加快扫描速度。设置要扫描的起始IP和结束IP，开对应IP主机端口是否回复来证明是否开放-TCP port scan is a collection of target host intruder port open one of the common practices, and multi-threaded scanning can greatly speed up the scanning speed. Set u