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Dimension ES-2008 Ethernet Switch
IP Subnetting Q
Chart 10 Subnet 4
NETWORK NUMBER LAST OCTET BIT
VALUE
IP Address 192.168.1. 192
IP Address (Binary) 11000000.10101000.00000001.
11000000
Subnet Mask (Binary) 11111111.11111111.11111111.
11000000
Subnet Address: 192.168.1.192 Lowest Host ID: 192.168.1.193
Broadcast Address: 192.168.1.255 Highest Host ID: 192.168.1.254
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 11 Eight Subnets
SUBNET SUBNET
ADDRESS
FIRST
ADDRESS
LAST
ADDRESS
BROADCAST
ADDRESS
1 0 1 30 31
2 32 33 62 63
3 64 65 94 95
4 96 97 126 127
5 128 129 158 159
6 160 161 190 191
7 192 193 222 223
8 224 223 254 255
The following table is a summary for class “C” subnet planning.
Chart 12 Class C Subnet Planning
NO. “BORROWED”
HOST BITS
SUBNET MASK NO.
SUBNETS
NO. HOSTS PER
SUBNET
1 255.255.255.128 (/25) 2 126
2 255.255.255.192 (/26) 4 62
3 255.255.255.224 (/27) 8 30