nanog mailing list archives
Re: CIDR Utilization
From: inetjunkmail <inetjunkmail () gmail com>
Date: Sat, 31 Oct 2015 10:29:03 -0400
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 () 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
Current thread:
- CIDR Utilization John Steve Nash (Oct 30)
- Re: CIDR Utilization joel jaeggli (Oct 30)
- Re: CIDR Utilization Theodore Baschak (Oct 30)
- RE: CIDR Utilization Jeremiah Millay (Oct 31)
- Re: CIDR Utilization inetjunkmail (Oct 31)
- Re: CIDR Utilization Baldur Norddahl (Oct 31)