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IP段是什么意思?镇江大带宽服务器43.248.99.X

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发表于 2023-7-15 17:35:01 | 显示全部楼层 |阅读模式

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IP段就是网段,一般指一个计算机网络中使用同一物理层设备(传输介质,中继器,集线器等)能够直接通讯的那一部分。例如,从43.248.99.1到43.248.99.255这之间就是一个网段。

在同一网段,要求网络标识相同。网络标识就是用IP的二进制与子网掩码的二进制数据作'与'运算(可用WINDOWS计算器算二进制),所得结果,而不是IP地址前几段相同就表示在同一网段。若网络标识相同,就表示在同一网段。

IP网段在中文的网络知识入门中,这个词更经常地被误用来指代“子网”,也就是网络层中由网关或路由器等设备隔开的不同部分。

例如IP为 192.168.0.1 ~ 192.168.0.254 的设备就位于掩码 255.255.255.0 的同一子网中,这句话经常被说成“位于192.168.0.x ‘网段’中”,如果不涉及网络层之下的结构,这么说不会混淆,但是在深入探讨互联网底层结构时,应该避免使用“网段”来指代“子网”。

IPv4的地址由四段数字组成(以后将扩充更改),常分为三类IP:

A类:0.0.0.0到127.255.255.255
B类:128.0.0.0到191.255.255.255
C类:192.0.0.0到223.255.255.255

IP默认分配的子网掩码每段只有255或0:

A类的默认子网掩码 255.0.0.0 一个子网最多可以容纳1677万多台电脑
B类的默认子网掩码 255.255.0.0 一个子网最多可以容纳6万台电脑
C类的默认子网掩码 255.255.255.0 一个子网最多可以容纳254台电脑


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