将给定网络划分为4个子网 [英] Dividing a given network in 4 subnets

问题描述

假设我获得了网络（57.70.32.0/21），我需要将其划分为4个大小相同的网络。

Lets suppose I get given the network (57.70.32.0/21) and I need to divide it into 4 equally sized networks.

我知道目前的掩码是（255.255.248.0），但我需要将给定的网络前缀长度更改为26，这样我才能得到4等于大小子网？基本上这是我最大的问题，如果我应该使用第4个八位字节进行子网划分或留在第3个进行。

I know the mask at the moment is (255.255.248.0) but would I need to change the prefix length of the network given to 26 so I can get the 4 equal size subnets? Basically that's my biggest question and also if I should then use the 4th octet for subnetting or stay with the 3rd to do it.

非常感谢任何帮助。

推荐答案

你可以分开您的ips分为4个网络，每个网络有510个IP，不包括网关，广播和网络ID。

you can divide your ips into 4 networks with 510 IPs each, not counting gateway, broadcast, and net id.

每个网络的cidr为/ 23，相当于子网255.255.254.0

each net will have a cidr of /23 which would equate to subnet 255.255.254.0

你可以划分它们分为以下子网：

you could divide them into subnets as follows:

57.70.32.0/23 
     first address: 57.70.32.0
     last address:  57.70.33.255

57.70.34.0/23
    first address: 57.70.34.0
    last address:  57.70.35.255

57.70.36.0/23
    first address: 57.70.36.0
    last address:  57.70.37.255

57.70.38.0/23
    first address: 57.70.38.0
    last address:  57.70.39.255

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