IP段就是網段，一般指一個計算機網絡中使用同一物理層設備（傳輸介質，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這之間就是一個網段。
在同一網段，要求網絡标識相同。網絡标識就是用IP的二進制與子網掩碼的二進制數據作'與'運算（可用WINDOWS計算器算二進制），所得結果，而不是IP地址前幾段相同就表示在同一網段。若網絡标識相同，就表示在同一網段。
IP網段在中文的網絡知識入門中，這個詞更經常地被誤用來指代“子網”，也就是網絡層中由網關或路由器等設備隔開的不同部分。
例如IP為 192.168.0.1 ~ 192.168.0.254 的設備就位于掩碼 255.255.255.0 的同一子網中，這句話經常被說成“位于192.168.0.x ‘網段’中”，如果不涉及網絡層之下的結構，這麼說不會混淆，但是在深入探讨互聯網底層結構時，應該避免使用“網段”來指代“子網”。
IPv4的地址由四段數字組成（以後将擴充更改），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默認分配的子網掩碼每段隻有255或0：
A類的默認子網掩碼 255.0.0.0 一個子網最多可以容納1677萬多台電腦
B類的默認子網掩碼 255.255.0.0 一個子網最多可以容納6萬台電腦
C類的默認子網掩碼 255.255.255.0 一個子網最多可以容納254台電腦
例馳網 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
103.88.32.3
103.88.32.4
103.88.32.5
103.88.32.6
103.88.32.7
103.88.32.8
103.88.32.9
103.88.32.10
103.88.32.11
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103.88.32.34
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103.88.32.36
103.88.32.37
103.88.32.38
103.88.32.39
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103.88.32.41
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103.88.32.254
103.88.32.255
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