What is the broadcast /17

Posted on 2010-01-07
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

    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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