Your files stay on your device

# CIDR overlap and gap checker

Pairwise overlaps and uncovered gaps over pasted CIDR blocks.
ClearCIDR blocks

Exact BigInt math over the shared ip-core: pairwise overlaps (identical / contains / partial), gaps between consecutive blocks, adjacency counts.
Paste, drop, or type to begin. Everything stays on this device.

## More network tools

- [IPv4 subnet calculator](/network/ipv4-subnet)
- [Subnet split & aggregate](/network/subnet-split)
[All network tools](/network)

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Canonical HTML: https://nutter.tools/network/cidr-check/
Markdown version: https://nutter.tools/network/cidr-check/index.md
Plain-text version: https://nutter.tools/network/cidr-check/index.txt
Agent index: https://nutter.tools/llms.txt