Nmap扫描IP段
nmap -p 80 125.80.192.72/24
–> 125.80.192.0 - 125.80.192.255
有时候您希望扫描整个网络的相邻主机。为此，Nmap支持CIDR风格的地址。您可以附加一个/numbit在一个IP地址或主机名后面， Nmap将会扫描所有和该参考IP地址具有 numbit相同比特的所有IP地址或主机。例如，192.168.10.0/24将会扫描192.168.10.0 (二进制格式: 11000000 10101000 00001010 00000000)和192.168.10.255 (二进制格式: 11000000 10101000 00001010 11111111)之间的256台主机。 192.168.10.40/24 将会做同样的事情。假设主机 scanme.nmap.org的IP地址是205.217.153.62， scanme.nmap.org/16 将扫描205.217.0.0和205.217.255.255之间的65,536 个IP地址。所允许的最小值是/1，这将会扫描半个互联网。最大值是/32，这将会扫描该主机或IP地址，因为所有的比特都固定了。
CIDR标志位很简洁但有时候不够灵活。例如，您也许想要扫描 192.168.0.0/16，但略过任何以.0或者.255 结束的IP地址，因为它们通常是广播地址。 Nmap通过八位字节地址范围支持这样的扫描您可以用逗号分开的数字或范围列表为IP地址的每个八位字节指定它的范围。例如，192.168.0-255.1-254 将略过在该范围内以.0和.255结束的地址。 范围不必限于最后的8位：0-255.0-255.13.37 将在整个互联网范围内扫描所有以13.37结束的地址。这种大范围的扫描对互联网调查研究也许有用。\r
IPv6地址只能用规范的IPv6地址或主机名指定。 CIDR 和八位字节范围不支持IPv6，因为它们对于IPv6几乎没什么用。\r
Nmap命令行接受多个主机说明，它们不必是相同类型。命令nmap scanme.nmap.org 192.168.0.0/8 10.0.0，1，3-7.0-255将和您预期的一样执行。
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Form Page: Nmap扫描IP段
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