Example Eight Subnets - ZyXEL Communications ZyWall 10 Reference Manual

ZyWALL 10~100 Series Internet Security Gateway
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
2
3
4
5
6
7
8
The following table is a summary for class "C" subnet planning.
8-6
Chart 8-10 Subnet 4
192.168.1.
11000000.10101000.00000001.
11111111.11111111.11111111.
Chart 8-11 Eight Subnets
FIRST ADDRESS
0
32
64
96
128
160
192
224
Lowest Host ID: 192.168.1.129
Highest Host ID: 192.168.1.190
NETWORK NUMBER
Lowest Host ID: 192.168.1.193
Highest Host ID: 192.168.1.254
LAST ADDRESS
1
33
65
97
129
161
193
223
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
IP Subnetting