Free tools

CIDR Subnet Calculator

IPv4 CIDR calculator. Convert IP/CIDR to network address, broadcast, netmask, wildcard mask, and usable host range — in your browser.

IPv4 CIDR
Tip: You can also paste a bare IP like 10.0.0.1 (defaults to /32).

IPv4 CIDR subnet calculator

Paste an IPv4 address and prefix (CIDR notation) like 192.168.1.10/24 to calculate the network address, broadcast address, netmask, wildcard mask, and usable host range. Everything runs locally in your browser.

How to use

  1. Enter an IPv4 address (optionally with /prefix).
  2. Click Calculate.
  3. Copy the summary for documentation or tickets.

What the fields mean

  • Network address: the first address in the subnet
  • Broadcast: the last address (used for broadcast in most subnets)
  • Usable hosts: typically excludes network/broadcast (except /31 and /32)

Common examples

  • /24 — 255.255.255.0 (typical LAN)
  • /16 — 255.255.0.0
  • /32 — single host

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