ZyXEL Communications ZyWALL 5 User Manual page 499

IP Address
IP Address (Binary)
Subnet Mask (Binary)
Subnet Address: 192.168.1.128
Broadcast Address: 192.168.1.191
IP Address
IP Address (Binary)
Subnet Mask (Binary)
Subnet Address: 192.168.1.192
Broadcast Address: 192.168.1.255
Example Eight Subnets
Similarly use a 27-bit mask to create 8 subnets (001, 010, 011, 100, 101, 110).
The following table shows class C IP address last octet values for each subnet.
SUBNET SUBNET ADDRESS
1 0
2 32
3 64
4 96
5 128
6 160
7 192
8 224
IP Subnetting
Chart J-9 Subnet 3
NETWORK NUMBER
192.168.1.
11000000.10101000.00000001.
11111111.11111111.11111111.
Lowest Host ID: 192.168.1.129
Highest Host ID: 192.168.1.190
Chart J-10 Subnet 4
NETWORK NUMBER
192.168.1.
11000000.10101000.00000001.
11111111.11111111.11111111.
Lowest Host ID: 192.168.1.193
Highest Host ID: 192.168.1.254
Chart J-11 Eight Subnets
FIRST ADDRESS LAST ADDRESS
1
33
65
97
129
161
193
223
ZyWALL 5 Internet Security Appliance
LAST OCTET BIT VALUE
128
10000000
11000000
LAST OCTET BIT VALUE
192
11000000
11000000
BROADCAST ADDRESS
30
62
94
126
158
190
222
254
31
63
95
127
159
191
223
255
J-5