Using classless addressing, an organization is granted the IP address block 14.1

Question

Using classless addressing, an organization is granted the IP address block 14.17.128.0/23. The network administrator wants to create 16 subnets. All subnets will have the same number of IP addresses (a) Find the maximum number of physical hosts that can be connected in a subnet. (b) Find the range of valid IP addresses that can be assigned to physical hosts in the very first subnet (with subnet ID 0) in dotted decimal IP address format. (c) Find the broadcast address in the very first subnet (with subnet ID 0) in dotted decimal IP address format. (d) Find the IP address assigned to the first physical host in the last subnet (with subnet ID 15) in dotted decimal IP address format. (show steps)

Explanation / Answer

In order to get 16 hosts, we need to borrow 4 bits from the host bits.

a.) Each subnet is of form w.x.y.z/27. So maximum number of physical hosts that can be connected in a subnet = 2^5 = 32

b.) Range of Valid IP addresses for first host = 14.17.128.1/27 to 14.17.128.30/27.

c.) Broadcast address for first subnet = 14.17.128.31/27

d.) IP address for the first host in last subnet = 14.17.255.225/27

Hope it helps, feel free to comment in case of any query.

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