cidr subtraction
Given a base network and a list of subnets to exclude, compute the minimal set of CIDR blocks that together cover everything in the base except the excluded subnets. IPv4 and IPv6 are supported. Your inputs are saved locally in your browser.
covering
addresses
The excluded subnets cover the entire base network — nothing remains.
visualization
Hilbert-curve mapping of . Excluded subnets shown in dark grey. Hover for details.