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Subnet mask - Finding out the IP ranges

933 views 2 replies 2 participants last post by  mcse_student 
#1 ·
Hello all! To cut a long story short, how can you find out the IP address ranges for any given subnet mask?

Example from book:

Class B address of 172.20.0.0.
5 bits borrowed from 3rd octect, which allows for 32 subnets (2 to the power of how many bits borrowed). Then it states 'on such a network, the first range of address for the first subnet is 172.20.0.1-172.20.7.254.

My questions:

1) What would the 2nd range be?
2) How do you work out the ranges for any given subnetted address?

Thanks!
 
#3 ·
Thanks Wanderer, thats very usefull! However, after inputting the details as per my example above I'm a little confused as to how the maximum subnets appears as 2048. The maximum hosts is 2046 which I understand fine (2 to the power of remaining host bits which is 11 = 2048-2). But as far as i was aware, the ammount of subnets you can have is calculated by 2 to the power of the number of network bits borrowed.

Any ideas?

Thanks again!
 
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