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
Enter comma-separated or newline-separated IPv4 or IPv6 CIDR blocks (e.g. 10.0.0.0/16, 10.0.32.0/20).
Analysis Results & Diagnostics
Subnet Overlap Collision
Subnets 10.0.0.0/16 and 10.0.32.0/20 overlap in address range 10.0.32.0 - 10.0.47.255.
Parent-Child Containment
10.0.0.0/16 completely encompasses smaller subnet 10.0.32.0/20.
Subnet Overlap Collisions (1)
| Subnet A | Subnet B | Overlapping IP Range |
|---|---|---|
| 10.0.0.0/16 | 10.0.32.0/20 | 10.0.32.0 - 10.0.47.255 (10.0.32.0/20) |
2D Subnet Tree Partition Matrix
10.0.0.0 - 10.0.255.25510.0.32.0 - 10.0.47.255Frequently 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.