IPv4 + IPv6
Switch modes instantly and calculate subnet boundaries accurately.
Subnetra: IPv4 IPv6 CIDR Calculator
Fast subnet math for IPv4 and IPv6. Built for practical network planning with clean, copy-ready results.
Features
Advanced Details
See IP class/type, binary values, integer/hex IDs, and reverse DNS.
Quick Workflow
Use CIDR presets, normalize addresses, and copy all results in one tap.
App Preview
Designed for readability in dark mode with focused cards and direct export-ready output.
