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CIDR Range Visualizer

An interactive CIDR block visualizer that displays network ranges as visual grids, helping you understand the scale of different CIDR notations before deploying cloud infrastructure. Perfect for cloud architects planning AWS VPCs or Azure VNets, network engineers designing subnet schemes, or DevOps teams allocating IP ranges for Kubernetes clusters. Enter any CIDR notation and see an instant visual grid where each square represents an IP address, color-coded for network, usable hosts, and broadcast addresses. Includes subnet division examples showing how to split networks into smaller chunks. Use Cidr Visualizer when you need answers fast during debugging, reviews, or incident triage. Paste your input, validate the output, then copy results into tickets or docs in seconds. Most processing runs in your browser, so you can test safely without unnecessary data exposure.

How to Use This Tool

  1. Enter CIDR Notation - Type any IP address with CIDR suffix (e.g., 192.168.1.0/24 or 10.0.0.0/16)
  2. Click Visualize - View the visual grid with color-coded addresses and network summary statistics
  3. Review Division Options - See examples of how to split the network into smaller subnets for segmentation

Why This Method?

CIDR (Classless Inter-Domain Routing) notation like /24 or /16 represents how many bits in the IP address are fixed as the network portion. A /24 network fixes 24 bits, leaving 8 bits for hosts (256 addresses), while a /16 network fixes 16 bits, leaving 16 bits for hosts (65,536 addresses). Larger networks have smaller CIDR numbers, which is counterintuitive without visualization.

When planning cloud VPCs, choosing the right CIDR block is critical. AWS recommends using /16 for VPCs (65,536 IPs) to allow room for growth, while subnets typically use /24 (256 IPs) or /20 (4,096 IPs). A /28 subnet provides only 16 addresses (14 usable), which might seem sufficient but leaves no room for scaling. This visualizer helps you see these differences instantly.

The color-coded grid shows network addresses (first IP), broadcast addresses (last IP), and usable host range in between. For small networks under 256 addresses, every IP is displayed. For larger networks, the grid shows a representative sample with the total count. Division examples demonstrate subnetting strategies: a /24 can become two /25 subnets, four /26 subnets, or eight /27 subnets, each with progressively fewer usable hosts.