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how-to

How to calculate a subnet

Get network, broadcast, host range, and mask from any IPv4 CIDR — without bit-counting in your head.

CIDR notation is short, but the math behind it is annoying without a calculator. The Subnet Calculator does it for you.

Steps

  1. Open the Subnet Calculator.
  2. Enter the CIDR (for example, 10.0.0.0/24).
  3. The tool returns:
    • Network address
    • Broadcast address
    • First and last usable host
    • Total addresses and usable hosts
    • Wildcard mask
    • Binary representation

This is a placeholder. Full guide coming soon.