0-bit = match
1-bit = ignore
'Don't care bits' are represented by binary 1's whilst the 'Do care bits' are represented by binary 0's. The exact opposite of the subnet mask. Taking 192.168.1.32/27 as an example. Subnet mask - 255.255.255.224
|
4th octet in decimal
|
32
|
|
4th octet in binary
|
0 0 1 0 0 0 0 0
|
|
4th octet mask in decimal
|
224
|
|
4th octet mask in binary
|
1 1 1 0 0 0 0 0
|
|
Now the 4th octet wildcard in binary
|
0 0 0 1 1 1 1 1
|
|
Now the 4th octet wildcard in decimal
|
31
|
255.255.255.255Wildcard mask - 0.0.0.31
- 255.255.255.224
-------------------
0. 0. 0. 31
