CIDR3 Example

Find the Network ID, First IP, Last IP and the Broadcast Address  for the following

190.95.209.90/22

From the CIDR, we see that there are 22 1's

1) CIDR Conversion
11111111.11111111.11111100.00000000
So we write it down

255.255.252.0

2) Find the Increment

The last 1 is in the 3rd OCTET
and it is in the 4's, so the Increment is 4


3)  List the networks until you find the correct network
   190.95.4.0
190.95.8.0
.
.
.
.
190.95.200.0
190.95.204.0
190.95.208.0        - 209 is between these two
190.95.212.0

 - This is  higher than the given ip , so going with the previous IP

190.95.208.0  is the Network ID

4) The First Host is   190.95.208.1

5) The last Host is  tricky
190.95.212.0    2  below this
190.95.211.254  - Would be the Last Ip Address

6) The Broadcast IP Address would be

190.95.211.255