Another subnet problem

Unanswered Question
May 17th, 2007

Im learning subnetting at the moment and I want to work out my work LAN network structure.

Ill try and keep this simple; one of the ip address's is This works out, using the Boolean And method, that the network number is, which sounds correct. But using methods that ive used to work out the number of hosts per subnet on other scenarios worked ok.

I worked it out that there are 510 hosts allowed per subnet with 128 subnets, is this correct?

Using the Subnet No. of is the below specifications correct?

Subnet ID's supported


Last subnet

Valid hosts per subnet - -

---------- -----------

Last valid host -

If I have gone wrong how would you work this problem out?

Thanks to all that reply.


I have this problem too.
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Richard Burts Thu, 05/17/2007 - 12:50


While there is sometimes utility in using subnet calculators such as suggested by hieu, I believe that there is much value in learning how to work these out for yourself logically (which is how I learned it). It looks to me like your statements are correct and that you are on the way to having a good understanding of how subnetting works.

Good luck.




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