如何根据 IP 地址和子网掩码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
• 掩码:255.255.240.0

什么是网络 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

让我们都写成二进制:

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)

网络地址和倒置子网掩码之间的按位OR将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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