miqal/subnify
VLSM subnet planning for real networksAlpha

Design and visualize subnet layouts in seconds

Plan VLSM networks fast, avoid overlaps, and ship cleaner subnet designs.

CIDR + VLSM
Calculation model
Subnet masks
Derived per block
Host ranges
Usable boundaries
Hierarchy view
Allocation context

Features

Focused subnet planning

Practical tools for fast, clear IPv4 subnet planning.

VLSM Calculator
Largest-first subnet allocation from host requirements.
Network Visualization
See how each subnet fits inside the parent network.
AI Designer
Generate draft subnet plans from requirements and refine quickly.
Instant Results
Browser-based calculations with immediate feedback.
RFC-Compliant Output
Standard CIDR output with RFC 1918 private ranges.
Export Ready
Export plans for handoff and documentation.
Subnet Hierarchy
Clear parent-child view of your subnet allocation.

Calculator

Build an allocation plan

Input a base CIDR block and required hosts per subnet.

Network Configuration
Base network and per-subnet host requirements

IPv4 network address.

Prefix length (0-32).

Each row defines one subnet and required hosts.

Calculation Results
Generated network, mask, range, and usable host data

Execute a calculation to populate this table

Start a subnet planning session

Use Subnify to draft and review CIDR/VLSM allocations directly in the browser.