# Thread: [RESOLVED] IP Subnet calculator

1. ## [RESOLVED] IP Subnet calculator

I need test data for a IP Subnet calculator I have developed. I have tested some obvious scenarios, and all seems good, but the person developing can often be the wrong person to test.

The calculator can do one of two things:

1 - given an existing network and CIDR(mask), and a new CIDR it will create a number of networks with the appropriate number of hosts.

2 - given an existing network and CIDR(mask), and a list of c,h, (c = count, h=number of hosts) it will create the networks.

So if you have a subnet problem you think would be good to check, please post here. I'll post the results.

Thanks in advance!

2. ## Re: IP Subnet calculator

This was asked somewhere else

Code:
```173.73.64.0 /20.

Divide the network block in order to provide the following subnetworks:

1 - with at least 1800 hosts
2 - with at least 500 hosts each
3 - with at least 240 hosts each```
Here is the result from the calculator

Code:
```173.73.64.0  /21 -> 1,800  (2,048)
173.73.72.0  /23 -> 500  (512)
173.73.74.0  /23 -> 500  (512)
173.73.76.0  /24 -> 254  (256) ++
173.73.77.0  /24 -> 240  (256)
173.73.78.0  /24 -> 240  (256)
173.73.79.0  /24 -> 240  (256)```
The ++ line was inserted by the calculator as an indication of the largest block left available.

3. ## Re: IP Subnet calculator

Going to mark this resolved, but an interesting question about non-contiguous masks was asked in another forum. So I added it to the calculator. Here is an example.

This is one subnet, with 28 bits of mask, which means there are 14 hosts available.

Code:
```Mask - 11111111111111111111111100111100
192.168.1.0 Network Number
192.168.1.1
192.168.1.2
192.168.1.3
192.168.1.64
192.168.1.65
192.168.1.66
192.168.1.67
192.168.1.128
192.168.1.129
192.168.1.130
192.168.1.131
192.168.1.192
192.168.1.193
192.168.1.194
192.168.1.195 Network Broadcast```

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