156 Chapter 5: IP Addressing
NOTE
These masks assume Class C networks.
NOTE
The local address is not considered an available address. Cisco offers a feature called ip subnet-
zero that allows a local address to be accessed. The concept of ip subnet-zero is beyond the
scope of this chapter and is not discussed in this book
Table 5-6 lists the available network addresses for subnet mask .240.
Table 5-5
Mask 224
Network
Available Addresses
Local Address
Broadcast Address
031
130
0
31
3263
3362
32
63
6495
6594
64
95
128159
129158
128
159
160191
161190
160
191
192223
193222
192
223
224255
225254
224
255
Table 5-6
Mask 240
Network
Available Addresses
Network
Available Addresses
015
Local address: 0
Broadcast address: 15
114
128143
Local address: 129
Broadcast address: 142
B142
129142
1631
Local address: 16
Broadcast address: 31
1730
144159
Local address: 145
Broadcast address: 158
145158
3247
Local address: 32
Broadcast address: 47
3346
160175
Local address: 160
Broadcast address: 175
161174
87200333.book Page 156 Wednesday, August 22, 2001 2:37 PM