Visual IPv6 Subnet Calculator
Split and merge IPv6 networks visually with a fast, interactive subnet calculator. Instantly see full addresses, network prefixes, host portions, address types, scope, and total addresses — with dynamic color-coded hierarchy visualization.
Visual IPv6 Subnet Calculator
This tool provides an interactive, color-coded map of your IPv6 address space. Enter your base network below and use the split or join buttons in the hierarchy column to dynamically carve out perfectly sized, non-overlapping IPv6 subnets. Each split borrows one prefix bit, halving the address block.
Interactive IPv6 Subnet Map
How to Use the IPv6 Visual Subnet Calculator
This tool gives you an interactive canvas for IPv6 address space. Instead of manually computing 128-bit boundaries, drag the prefix slider and click the color-coded hierarchy blocks to carve out subnets dynamically.
- Step 1: Set Your Base Network. Enter a valid IPv6 address (compressed or full) and drag the prefix slider to select your starting block size (default /64). The table instantly shows that parent network with all computed details.
- Step 2: Split Subnets. Click the green Split block on any row. The tool borrows one prefix bit, dividing that subnet into two equal halves — e.g., a /48 becomes two /49 blocks.
- Step 3: Join Subnets. Click a blue Join block to merge two sibling subnets back into their parent, provided neither has been further split.
- Step 4: Customize & Export. Toggle columns using "Show Columns", then use Copy or Download CSV to export your IPv6 plan.
Where Can We Use This IPv6 Calculator?
IPv6 subnetting is essential as networks move beyond IPv4. Here are key scenarios where this visual tool saves time:
- ISP Address Allocation: Delegate smaller prefixes (/48s, /56s) from a large ISP block (/32) to customers without overlap.
- Enterprise Network Design: Segment IPv6 space across sites, VLANs, and departments — visually verify how a /48 splits cleanly into /64 LAN segments.
- Cloud & VPC Planning: Plan IPv6 CIDR blocks for AWS VPC, Azure VNet, or Google Cloud VPC, ensuring each subnet gets a clean, non-overlapping prefix.
- IT Certification Study: Practice IPv6 subnetting for CCNA, CCNP, or other exams and visually verify your prefix boundary calculations.