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計算子網掩碼中存在的主機數

時間：2014-04-27 21:19:08 阅读：731 評論：0 收藏：0 [點我收藏+]

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一个局域网中某台主機的ip地址为176.68.160.12,使用22位作为网络 ,那么该局域网的子网掩码为____,最多可以连接的主機数为____.

該局域網的子網掩碼是255.255.252.0
最多可以連接的主機數量爲1022台
计算子网掩码的过程是：子网掩码是由连续的“1”和连续的“0”构成，所以既然网络位是22位，而子网掩码一共是有32位组成，说明前22位都是1，后10位都是0 因此用2进制表示就是11111111 11111111 11111100 00000000
而上述二進制換算成十進制結果，並用点分十進制表示就是255.255.252.0
而最多連接的主機數量用公式2^H-2(2的H次方減2），其中H表示主機位數，你的網絡位占了22位，那麽主機位就是10位，那麽2的10次方減去2就是1022台了

已知某一主機的Ip为201.203.236.184，子网掩码为255.255.255.192 该主機所在子网最多允许有多少台主機 2^6-2=62個

使用子網掩碼255.255.248.0，一共能容納多少台主機.如何計算。謝謝。

公司希望合并192.24.32.0/24～192.24.39.0/24，使用子網掩碼255.255.248.0，一共能容納多少台主機.如何計算。謝謝。

合並後的網絡爲192.24.32.0/21,也就是子網掩碼255.255.248.0,主機數2的(32-21)減2等于2046個。
在這裏要注意不是簡單的8*254,因爲合並後像192.24.32.255等這些地址都是主機地址了。
看一個地址是不是主機地址看他的主機位是否不全是0和全是1,不是看最後一個字節是否是0和255

看你後面的子網掩碼就可以知道這個網絡可以容納多少台主機！
2的11次方减2 等于2046台,（256-248）*256-2=2046 ;

減二是指去掉一個網絡地址和一個廣播地址，一共有2046個ip地址主機

這是大家公認的原則。
即：主機位全为0是網絡號，主機位全位1是廣播地址。
這兩個是不能寫在PC和路由器端口上的。
我們只要記住並遵守這一原則即可。

主機位全为0的为網絡號，主機位全为1的是廣播地址。

計算子網掩碼中存在的主機數,布布扣,bubuko.com

計算子網掩碼中存在的主機數

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原文地址：http://www.cnblogs.com/jinjiangongzuoshi/p/3694644.html

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