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What is the broadcast /17

Posted on 2010-01-07
Medium Priority
Last Modified: 2012-05-08
Can you tell what is the broadcast /17 and how do you arrive at this using strict binary math, no tricks, magic numbers...
Question by:dmwynne
1 Comment
LVL 53

Accepted Solution

Infinity08 earned 2000 total points
ID: 26201558
The network is (0x7B010000)
The netmask is 17 bits wide, so (0xFFFF8000)

The broadcast address is thus :

        0x7B010000 OR NOT(0xFFFF8000) = 0x7B010000 OR 0x00007FFF = 0x7B017FFF

which is equivalent to

Generic formula :

        broadcast = network OR NOT(netmask)

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