如何从 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?
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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
让我们用二进制来写:
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)
网络地址和反转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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