Extending IP Addresses
79
Eliminating host IP addresses that contain all ones and all zeros as before,
we discover that our IP address range for this segment is 172.16.0.9
172.16.0.14. The broadcast address is all host bits on, or 172.16.0.15. Now
we will perform the same steps on the Ethernet user segment, as shown in
Table 3.11, and the server farm segment, as shown in Table 3.12.
T A B L E 3 . 1 1
Valid Addresses for Ethernet Segment in Figure 3.2
3rd Octet
4th Octet
Decimal IP Address
128 64 32 16 8 4 2 1
128 64 32 16 8 4 2 1
(Last 16 bits in bold)
Subnet mask
1 1 1 1 1 1 1 1
0 0 0 0 0 0 0 0
255.255.255.0
Network
0 0 0 0 0 0 0 1
0 0 0 0 0 0 0 0
172.16.1.0
First IP in
range
0 0 0 0 0 0 0 1
0 0 0 0 0 0 0 1
172.16.1.1
Last IP in
range
0 0 0 0 0 0 0 1
1 1 1 1 1 1 1 0
172.16.1.254
Broadcast
0 0 0 0 0 0 0 1
1 1 1 1 1 1 1 1
172.16.1.255
T A B L E 3 . 1 2
Valid Addresses for Server Farm Segment in Figure 3.2
3rd Octet
4th Octet
Decimal IP Address
128 64 32 16 8 4 2 1
128 64 32 16 8 4 2 1
(Last 16 bits in bold)
Subnet mask
1 1 1 1 1 1 1 0
0 0 0 0 0 0 0 0
255.255.254.0
Network
0 0 0 0 0 0 1 0
0 0 0 0 0 0 0 0
172.16.2.0
First IP in
range
0 0 0 0 0 0 1 0
0 0 0 0 0 0 0 1
172.16.2.1
Last IP in
range
0 0 0 0 0 0 1 1
1 1 1 1 1 1 1 0
172.16.3.254
Broadcast
0 0 0 0 0 0 1 1
1 1 1 1 1 1 1 1
172.16.3.255
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