Example 5: Classless Inter-Domain Routing (CIDR) (Super-netting)

Question:

IP                           : 172.16.5.225

Subnet Mask         : 255.255.255.192

Find the Network ID?

Answer:

Converting IP Address to Binary

                                           
  Converting IP Address to Binary

For IP 192, Binary is  11000000 

For IP 225, Binaryl is  11100001

IP and Subnet Mask in Binary

24 + 2 (2 Bits Borrowed) = 26 Bits Network Portion 

Network ID Rule ->           Network – Constant

                                           Host       - Zero’s

Make Host as 0's

So Network ID is 172.16.5.192