如何从IP地址和子网掩码中确定网络和广播地址？ [英] How can I determine network and broadcast address from the IP address and subnet mask?

问题描述

例如：

• IP地址： 130.45.34.36


• 面具： 255.255.240.0

• IP Address: 130.45.34.36
• Mask: 255.255.240.0

什么将是网络ID /子网地址，以及
广播地址？

What would be Net ID/Subnet Address, and Broadcast Address?

推荐答案

让我们用二进制写两个：

Let's write both in binary:

130.45.34.36 = 10000010.00101101.00100010.00100100

255.255.240.0 = 11111111.11111111.11110000.00000000

两者之间的按位 AND 将为我们提供网络地址：

A bitwise AND between the two would give us the network address:

10000010.00101101.00100010.00100100   (ip address)
AND
11111111.11111111.11110000.00000000   (subnet mask)
=
10000010.00101101.00100000.00000000 = 130.45.32.0 (the resulting network address)

网络地址与网络地址之间的按位 OR 反向子网掩码会为我们提供广播地址：

A bitwise OR between the network address and the inverted subnet mask would give us the broadcast address:

10000010.00101101.00100000.00000000   (netadress)
OR
00000000.00000000.00001111.11111111   (inverted subnet mask)
=
10000010.00101101.00101111.11111111 = 130.45.47.255 (broadcast address)

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