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IP / CIDR Subnet Calculator

Calculate an IPv4 subnet from CIDR: network, broadcast, host range, netmask, and host count.

IP/CIDR Calculator: enter a range like 192.168.1.0/24 to get the subnet mask, address range, number of usable hosts, and broadcast address.

How to use IP / CIDR Calculator

  1. Enter an IP address with its prefix (e.g., /24).
  2. View the subnet mask, host range, and broadcast address.

Frequently asked questions

How many hosts does a /24 have?

A /24 network has 256 addresses, of which 254 are usable for hosts.

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🔒 IP / CIDR Subnet Calculator runs entirely in your browser — the data you enter is not sent to any server. Free, no sign-up required. See145 free dev tools more.