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CIDR Overlap Checker

v1.2.1

Detect overlaps and intersections across multiple CIDR network ranges.

Detects overlaps and intersections across multiple CIDR ranges — paste a list of networks and instantly see which ones share address space, useful for VPC planning and firewall auditing.

How to use
  • →Paste one CIDR per line (e.g. 10.0.0.0/24).
  • →Overlapping pairs are highlighted in the result table with the conflicting range shown.
  • →Use this before deploying VPCs, subnets, or firewall rules to catch conflicts early.

Enter two CIDR notations and click Check Overlap to compare networks.