CIDR Utilization

[John Steve Nash <john.steve.nash () gmail com>]

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