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A large number of consecutive IP addresses are

available according to this mask


that four organizations, A, B, C, and D,

request addresses according to the following

subnet masks:,, and respectively,

and in that order. For each of these, give the

first IP address assigned, the last IP address

assigned, and the mask in the w.x.y.z/s notation.

Also, write the addresses of unassigned blocks if


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