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Vantage RADIUS User’s Guide
H-4 IP Subnetting
Subnet Mask 255.255.255. 0
Subnet Mask (Binary) 11111111.11111111.11111111. 00000000
The first three octets of the address make up the network number (class “C”). You want to have
two separate networks.
Divide the network 192.168.1.0 into two separate subnets by converting one of the host ID bits of
the IP address to a network number bit. The “borrowed” host ID bit can be either “0” or “1” thus
giving two subnets; 192.168.1.0 with mask 255.255.255.128 and 192.168.1.128 with mask
255.255.255.128.
In the following charts, shaded/bolded last octet bit values
indicate host ID bits “borrowed” to form network ID bits. The
number of “borrowed” host ID bits determines the number of
subnets you can have. The remaining number of host ID bits
(after “borrowing”) determines the number of hosts you can
have on each subnet.
Chart H-5 Subnet 1
NETWORK NUMBER LAST OCTET BIT VALUE
IP Address 192.168.1. 0
IP Address (Binary) 11000000.10101000.00000001.
00000000
Subnet Mask 255.255.255. 128
Subnet Mask (Binary) 11111111.11111111.11111111.
10000000
Subnet Address: 192.168.1.0 Lowest Host ID: 192.168.1.1
Broadcast Address: 192.168.1.127 Highest Host ID: 192.168.1.126
Chart H-6 Subnet 2
NETWORK NUMBER LAST OCTET BIT VALUE
IP Address 192.168.1. 128
IP Address (Binary) 11000000.10101000.00000001.
10000000
Subnet Mask 255.255.255. 128
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