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IP地址分类

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IP地址分类:

A:首位为0;1.0.0.0~126.0.0.0;主机号24位
B:前两位为10;128.1.0.0~191.255.0.0;主机号16位
C:前三位为110;192.0.1.0~223.255.255.0;主机号8位
D:前四位为1110;224.0.0.0~239.255.255.255
E:前四位为1111;240.0.0.0~255.255.255.254


其他说明:

  1. 主机号为0的网络地址,表示网络本身。例如202.120.95.0表示一个C类网络。
  2. 主机号全为1的地址保留做为定向广播。例如202.120.95.255表示一个广播地址。
  3. 127.0.0.0保留用于环回用来测试TCP/IP以及本机进程间的通信。故网络号为127的分组永远不会出现在网络上,而且主机或者路由器永远不能为127的地址传播选路或者可达性信息。他不是一个网络地址。
    在IP地址3种主要类型里,各保留了3个区域作为私有地址,其地址范围如下:
  • A类地址:10.0.0.0~10.255.255.255
  • B类地址:172.16.0.0~172.31.255.255
  • C类地址:192.168.0.0~192.168.255.255

还有一个全1的网络地址,即255.255.255.255是一个受限的网络地址,用于广播!!!


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IP地址分类