Monday, April 21, 2014

IP subnetting unraveled

Consider the following address in CIDR notation: /13

1) What is the network address?

2) What is the broadcast address?

First, determine the subnet mask in dotted decimal notation:

Next, calculate: IP_Address AND Mask.  This reveals the network address as (NET_address)

Then, determine the wildcard mask (WC_mask) by inverting 1's and 0's in the subnet mask:

Finally, calculate: NET_address OR WC_mask, and this reveals the broadcast address:

Now, practice this method on /28 and if you are feeling adventurous, try /22

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