16.0.0 172.16.0.1 to 172.16.15.254 172.16.15.255
1 172.16.16.0 172.16.16.1 to 172.16.31.254 172.16.31.255
2 172.16.32.0 172.16.32.1 to 172.16.47.254 172.16.47.255
13 172.16.208.0 172.16.208.1 to 172.16.223.254 172.16.223.255
14 172.16.224.0 172.16.224.1 to 172.16.239.254 172.16.239.255
All 1s 172.16.240.0 172.16.240.1 to 172.16.255.254 172.16.255.255
Constructing a Network Addressing Scheme 269
Figure 4-24 Class A Address with Nondefault Subnet Mask
The following outlines the steps and shows the details of each operation in the eight-step
process:
Step 1 Write the octet that is being split in binary (00010000).
Step 2 Write the mask bits of the same octet (11000000).
Step 3 Draw a vertical line to delineate the network-signi?¬?cant bits in the
assigned IP address. Put a line under the mask so that you can view the
signi?¬?cant bits in the IP address (00000000).
Step 4 Copy the signi?¬?cant bits four times.
Step 5 In the ?¬?rst line, de?¬?ne the network address by placing 0s in the remaining
host bits (00000000.00000000).
Step 6 In the last line, de?¬?ne the directed broadcast address by placing all 1s in
the host bits (00111111.11111111).
Step 7 In the middle lines, de?¬?ne the ?¬?rst and last host ID for this
subnet??”00000000.
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