[185622] in North American Network Operators' Group
Re: CIDR Utilization
daemon@ATHENA.MIT.EDU (Theodore Baschak)
Fri Oct 30 22:50:58 2015
X-Original-To: nanog@nanog.org
From: Theodore Baschak <theodore@ciscodude.net>
In-Reply-To: <CA+OqHhABBFK6YQ9nQCRfOvP58maV5Kx4wj3oYPpFWrDyJDcapg@mail.gmail.com>
Date: Fri, 30 Oct 2015 21:50:54 -0500
To: John Steve Nash <john.steve.nash@gmail.com>
Cc: nanog@nanog.org
Errors-To: nanog-bounces@nanog.org
> On Oct 30, 2015, at 7:51 PM, John Steve Nash =
<john.steve.nash@gmail.com> wrote:
>=20
> Hi,
>=20
> 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.
> <snip>
I've used subnetsmngr for this in the past. Proper usage of it thru the =
UI forces you to fully allocate (as compared to sparse allocating) your =
subnets, basically the same way subetting is taught in base level =
networking certifications. This makes finding the un-used subnets very =
easy.
http://sourceforge.net/p/subnetsmngr/wiki/Home/ =
<http://sourceforge.net/p/subnetsmngr/wiki/Home/>
NIPAP allows you to do the same as well, but will let subnets be sparse =
allocated, so you won't necessarily have pre-created them waiting to be =
used later on.=20
http://spritelink.github.io/NIPAP/ <http://spritelink.github.io/NIPAP/>
NIPAP also has a nice CLI interface.
Both are also open source, full v4/v6.
Theo=
