ZyWALL 5 User's Guide
Table 22 Subnet 4
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.
Table 23 Eight Subnets
SUBNET
1
2
3
4
5
6
7
8
The following table is a summary for class "C" subnet planning.
Table 24 Class C Subnet Planning
NO. "BORROWED" HOST
BITS
1
2
3
4
5
6
7
560
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
SUBNET ADDRESS FIRST ADDRESS
0
1
32
33
64
65
96
97
128
129
160
161
192
193
224
225
SUBNET MASK
255.255.255.128 (/25)
255.255.255.192 (/26)
255.255.255.224 (/27)
255.255.255.240 (/28)
255.255.255.248 (/29)
255.255.255.252 (/30)
255.255.255.254 (/31)
LAST OCTET BIT VALUE
192
11000000
11000000
BROADCAST
LAST ADDRESS
ADDRESS
30
31
62
63
94
95
126
127
158
159
190
191
222
223
254
255
NO. HOSTS PER
NO. SUBNETS
SUBNET
2
126
4
62
8
30
16
14
32
6
64
2
128
1
Appendix C IP Subnetting