Nortel Contivity 221 User Manual page 455

G-6 IP Subnetting
Chart G-10 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.
Chart G-11 Eight Subnets
SUBNET SUBNET ADDRESS
1 0
2 32
3 64
4 96
5 128
6 160
7 192
8 224
The following table is a summary for class "C" subnet planning.
Chart G-12 Class C Subnet Planning
NO. "BORROWED" HOST BITS
1
2
3
317517-A Rev 00
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
FIRST ADDRESS LAST ADDRESS
1 30
33 62
65 94
97 126
129 158
161 190
193 222
223 254
SUBNET MASK NO. SUBNETS
255.255.255.128 (/25)
255.255.255.192 (/26)
255.255.255.224 (/27)
LAST OCTET BIT VALUE
192
11000000
11000000
BROADCAST ADDRESS
31
63
95
127
159
191
223
255
NO. HOSTS PER SUBNET
2 126
4 62
8 30