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Table 50 Subnet 1 (continued)
IP/SUBNET MASK
Subnet Address: 192.168.1.0
Broadcast Address:
192.168.1.127
Table 51 Subnet 2
IP/SUBNET MASK
IP Address
IP Address (Binary)
Subnet Mask
Subnet Mask (Binary)
Subnet Address:
192.168.1.128
Broadcast Address:
192.168.1.255
Host IDs of all zeros represent the subnet itself and host IDs of all ones are the broadcast
address for that subnet, so the actual number of hosts available on each subnet in the example
7
above is 2
192.168.1.0 with mask 255.255.255.128 is the subnet itself, and 192.168.1.127 with mask
255.255.255.128 is the directed broadcast address for the first subnet. Therefore, the lowest IP
address that can be assigned to an actual host for the first subnet is 192.168.1.1 and the highest
is 192.168.1.126. Similarly the host ID range for the second subnet is 192.168.1.129 to
192.168.1.254.
Example: Four Subnets
The above example illustrated using a 25-bit subnet mask to divide a class "C" address space
into two subnets. Similarly to divide a class "C" address into four subnets, you need to
"borrow" two host ID bits to give four possible combinations (00, 01, 10 and 11). The subnet
mask is 26 bits (11111111.11111111.11111111.11000000) or 255.255.255.192. Each subnet
contains 6 host ID bits, giving 2
all ones is the broadcast address on the subnet).
Table 52 Subnet 1
IP/SUBNET MASK
IP Address
IP Address (Binary)
Subnet Mask (Binary)
NETWORK NUMBER
Lowest Host ID: 192.168.1.1
Highest Host ID: 192.168.1.126
NETWORK NUMBER
192.168.1.
11000000.10101000.00000001.
255.255.255.
11111111.11111111.11111111.
Lowest Host ID: 192.168.1.129
Highest Host ID: 192.168.1.254
– 2 or 126 hosts for each subnet.
6
-2 or 62 hosts for each subnet (all zeroes is the subnet itself,
NETWORK NUMBER
192.168.1.
11000000.10101000.00000001.
11111111.11111111.11111111.
P-660R-Tx v2 Series User's Guide
LAST OCTET BIT
VALUE
LAST OCTET BIT VALUE
128
10000000
128
10000000
LAST OCTET BIT
VALUE
0
00000000
11000000
153
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