ST Micro Connect 2
Choosing an IP address
7912386 Rev 12
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D.5.1 Example
This example compares the following two network addresses to check if they are on the
same subnet:
Address A:
192.168.16.20
, hex representation:
0xC0A81014
, binary representation:
11000000101010000001000000010100
Address B:
192.168.17.20
, hex representation
0xC0A81114
, binary representation:
11000000101010000001000100010100
Network mask for classful decimal
255.255.255.000
, hex representation:
0xFFFFFF00
,
binary representation:
11111111111111111111111100000000
Network mask for classless decimal
255.255.240.000
hex representation
0xFFFFF000
binary representation:
11111111111111111111000000000000
To determine the subnet for address A with classful network MASK:
Address 11000000101010000001000000010100
Mask 11111111111111111111111100000000
Subnet 11000000101010000001000000000000
#bitwise AND
To determine the subnet for address B with classful network MASK:
Address 11000000101010000001000100010100
Mask 11111111111111111111111100000000
Subnet 11000000101010000001000100000000
#bitwise AND
To determine the subnet for address A with classless network MASK:
Address 11000000101010000001000000010100
Mask 11111111111111111111100000000000
Subnet 11000000101010000001000000000000
#bitwise AND
To determine the subnet for address B with classless network MASK:
Address 11000000101010000001000100010100
Mask 11111111111111111111100000000000
Subnet 11000000101010000001000000000000
#bitwise AND
The results show that for the classful network mask the addresses A and B are on separate
subnets. When using the classless network mask the addresses are on the same subnet.
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