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CIDR, IP地址段问题 #3

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csrgxtu opened this issue Apr 14, 2015 · 3 comments
Open

CIDR, IP地址段问题 #3

csrgxtu opened this issue Apr 14, 2015 · 3 comments

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@csrgxtu
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csrgxtu commented Apr 14, 2015

在一个CIDR类型的地址段中，有哪些IP不可用？如64.18.0.0/20中，都有哪些IP地址不可用？是只有_...0和_...255不可用吗？
@lyt8384
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lyt8384 commented Apr 15, 2015

要算一下的，你64.18.0.0/20 掩码是255.255.240.0
首先网络号的地址64.18.0.0不能用。。还有广播地址64.18.15.255不能用其他都能用。。。例如 64.18.1.0 和64.18.1.255都是可用的~~~

@csrgxtu
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csrgxtu commented Apr 15, 2015

@lyt8384 👍
那就是说，一个IP地址段中，一般是第一个和最后一个地址不能使用。因为它们要被用作广播。

@lyt8384
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lyt8384 commented Apr 15, 2015

是的。最后一个是广播地址。。第一个是网络号

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