NETWORKING · CIDR & SUBNETS
Visual CIDR & Subnet Overlap Matrix
Detect IP range collisions across AWS VPCs, Kubernetes clusters, and VPN meshes, visualize tree partitions, and calculate available free subnet allocations.
CIDR Blocks Input
Paste IPv4 or IPv6 CIDRs from a list, Terraform, JSON, YAML, or route output. Networks are extracted automatically.
Frequently Asked Questions
What is CIDR overlap collision?
CIDR overlap occurs when two or more network subnets share one or more IP addresses, leading to routing conflicts in VPC peering, Kubernetes pods/services, or VPN connections.
How does free subnet allocation work?
Given a parent block and target prefix size, the algorithm scans for the first contiguous IP block of that size that does not overlap with any existing assigned subnets.