CIDR Utilization

Mon Nov 2 13:11:42 UTC 2015

Learned that attachments do make it to the list.  Here's a link:
http://pastebin.com/tMdcfvji

On Sat, Oct 31, 2015 at 10:29 AM, inetjunkmail <inetjunkmail at gmail.com>
wrote:

> Attached is a perl script I wrote for a coworker that you can tweak as
> you'd like.  It's designed to log into a router and dump the route table(s)
> and find used/unused subnets in a given supernet.  Available routes are
> green and used routes are red.  Yellow routes are routes where we have
> route and a more specific route so the first route is probably an aggregate
> and there _may_ be open space available.
>
> On Fri, Oct 30, 2015 at 8:51 PM, John Steve Nash <
> john.steve.nash at gmail.com> wrote:
>
>> Hi,
>>
>> I'm looking for any tool or a way I could specify a CIDR and the prefixes
>> that are being used within this CIDR and the tool show me all free
>> supernets.
>>
>> Example:
>>
>> 192.168.0.0/24 - CIDR
>>
>> Used subnet's:
>>
>> 192.168.0.1/32
>> 192.168.0.8/27
>> 192.168.0.64/26
>> 192.168.0.68/32
>> 192.168.0.96/29
>>
>> Tool Result => Free Subnet's:
>>
>> 192.168.0.2/31
>> 192.168.0.4/30
>> 192.168.0.32/27
>> 192.168.0.128/25
>>
>> Regards,
>>
>> John
>>
>
>