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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.

Of the calculators I looked at on the web none seem to have this kind of functionality.

Thanks in advance!

Here is one sample:

Given this network 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

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.

Here is a sample of going from /24 to /26

192.168.123.0  /26 -> 62  (64)
192.168.123.64  /26 -> 62  (64)
192.168.123.128  /26 -> 62  (64)
192.168.123.192  /26 -> 62  (64)
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In the first example, I entered a host in the network, the cidr, and 1,1880 2,500 3,240 Press button. In the second I entered a host in the network, the cidr, and a new cidr. Press button. – dbasnett Feb 6 '10 at 17:59
This is pretty neat. Are you planning on releasing this software? I'll try and come up with a scenario today to help test. – einstiien Feb 6 '10 at 18:09
This should be a community wiki. – Zypher♦ Feb 6 '10 at 18:19
What does "This should be a community wiki." mean? – dbasnett Feb 6 '10 at 22:22
@dbasnett: Marking a post community wiki (check box below and on the right hand side of the text input box) causes upvotes/downvotes to not generate rep. See the FAQ for a full explaination. – Zypher♦ Feb 7 '10 at 0:41
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closed as not a real question by Zypher♦, Jim B, Jeff Atwood♦ Feb 8 '10 at 8:53

It's difficult to tell what is being asked here. This question is ambiguous, vague, incomplete, overly broad, or rhetorical and cannot be reasonably answered in its current form. See the FAQ.

3 Answers

up vote 0 down vote

http://www.heise.de/netze/tools/netzwerkrechner

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I have seen a lot of those. None I have seen provides a list based on criteria. – dbasnett Feb 6 '10 at 17:57
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up vote 0 down vote

Did you think about Non-Contiguous netmasks? While not in widespread use, they are legal according to RFC950.

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The short answer is no, but the tool could be used manually as the other tools do. – dbasnett Feb 6 '10 at 22:21
After thinking about this I couldn't remember ever doing this or seeing, all I remember is hearing about it, and my first Cisco router was an AGS+ around 1990. – dbasnett Feb 6 '10 at 23:29
After further thought (thanks svnklp) I realized that it wouldn't be that hard to do, but if I did it, would someone actually use it, which IMHO would not be a good thing. – dbasnett Feb 7 '10 at 12:15
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up vote 0 down vote

OK, OCD'ing! Here are the hosts for a non-contiguous netmask.

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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BTW - it is 28 bits of mask. – dbasnett Feb 7 '10 at 18:22
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