VLSM Short-cut

I hope this post will guide you to calculate VLSM very shortly. Also you don’t have to remember binary for every number except subnet mask.

I take an IP address, for example: 192.168.100.40 /27


1


Step 1 : Subnet Mask

3


Step 2 : Network Address and Broadcast Address

Fill first 3 octets with IP Address.

4


5


6


Now the first number of the block is Network Address and Last number of block is Broadcast Address.

7


Step 3 : Valid IP Range

9


Step 4 : Number of Hosts

10

5 Responses so far.

  1. Anonymous says:

    Very nice and easy explanation.
    Thank you

  2. 김미라 says:
    This comment has been removed by the author.
  3. Anonymous says:

    Thank you so much . That was informative .

  4. Anonymous says:

    thx a lot for the tutorial

  5. Debashish says:

    Excellent !! Thanks a LOT for the easy explanation !

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