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## Forum Replies

1. Hi Rene,
Very Good article for Beginners.

Thanks,
Srini

2. Hi,
Under Class A subnetting section, the subnet mask should be 255.240.0.0 instead of 255.0.0.0.
Typo I guess.

3. Hi George,

Let’s walk through this example together, that might help…

First we need to figure out the network address and to do that, we need to take a close look at the subnet mask:

255.255.255.248

The subnet mask defines how large each subnet is. You can do this in binary but I’ll use decimal since it’s faster. A quick method is to take the number 256 minus the subnet mask. We are looking at the 4th octet so that’s 248:

256 - 248 = 8

We now know that each subnet has 8 addresses. Let’s start counting from 0 to show you how it works:

Subnet #1 120.48.7.0
Subnet

... Continue reading in our forum

4. Hi Rene,

You are doing a good Job. I wanted to ask, in your example you have said 120.48.7.104 is the first address for that block? I thought .104 is the network and the first usable address will start from 105? If you could clarify that for me. Thanks

5. Ali,
You are correct, and I have corrected the error. Nice catch.

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