什么是IP段？

IP段就是網(wǎng)段，一般指一個計算機(jī)網(wǎng)絡(luò)中使用同一物理層設(shè)備（傳輸介質(zhì)，中繼器，集線器等）能夠直接通訊的那一部分。例如，從192.168.0.1到192.168.255.255這之間就是一個網(wǎng)段。

在同一網(wǎng)段，要求網(wǎng)絡(luò)標(biāo)識相同。網(wǎng)絡(luò)標(biāo)識就是用IP的二進(jìn)制與子網(wǎng)掩碼的二進(jìn)制數(shù)據(jù)作'與'運(yùn)算（可用WINDOWS計算器算二進(jìn)制），所得結(jié)果，而不是IP地址前幾段相同就表示在同一網(wǎng)段。若網(wǎng)絡(luò)標(biāo)識相同，就表示在同一網(wǎng)段。

IP網(wǎng)段在中文的網(wǎng)絡(luò)知識入門中，這個詞更經(jīng)常地被誤用來指代“子網(wǎng)”，也就是網(wǎng)絡(luò)層中由網(wǎng)關(guān)或路由器等設(shè)備隔開的不同部分。

例如IP為 192.168.0.1 ~ 192.168.0.254 的設(shè)備就位于掩碼 255.255.255.0 的同一子網(wǎng)中，這句話經(jīng)常被說成“位于192.168.0.x ‘網(wǎng)段’中”，如果不涉及網(wǎng)絡(luò)層之下的結(jié)構(gòu)，這么說不會混淆，但是在深入探討互聯(lián)網(wǎng)底層結(jié)構(gòu)時，應(yīng)該避免使用“網(wǎng)段”來指代“子網(wǎng)”。

IPv4的地址由四段數(shù)字組成（以后將擴(kuò)充更改），常分為三類IP:

A類：0.0.0.0到127.255.255.255

B類：128.0.0.0到191.255.255.255

C類：192.0.0.0到223.255.255.255

IP默認(rèn)分配的子網(wǎng)掩碼每段只有255或0：

A類的默認(rèn)子網(wǎng)掩碼　255.0.0.0　一個子網(wǎng)最多可以容納1677萬多臺電腦

B類的默認(rèn)子網(wǎng)掩碼　255.255.0.0　一個子網(wǎng)最多可以容納6萬臺電腦

C類的默認(rèn)子網(wǎng)掩碼　255.255.255.0　一個子網(wǎng)最多可以容納254臺電腦

例馳網(wǎng) i9 12900k高配置高防大帶寬ip段（TCP_SYN,ACK,RST）展示：

103.88.32.1

103.88.32.2

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