httpscan是一个扫描指定CIDR网段的Web主机的小工具。和端口扫描器不一样，httpscan是以爬虫的方式进行Web主机发现，因此相对来说不容易被防火墙拦截。
httpscan会返回IP http状态码 Web容器版本 以及网站标题。
Usage：./httpscan IP/CIDR –t threads
Example:./httpscan.py 10.20.30.0/24 –t 10
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