I’m looking for a quick way to find unused subnets. Let’s say I have a /19 that is then divided into several /24’s and smaller networks.
For example I might have routes for 10.0.0.0/28 10.0.0.16/28 10.0.0.32/28
Ideally I just want to enter 10.0.0.0/19 and paste the routing table and receive a report that 10.0.0.24/28 seems to be unused.
Is there such a tool or script?
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