IP Subnet Calculator - Free Online Tool | PivaBox

Calculate network address, broadcast, host range, and usable hosts from CIDR notation

How to Use IP Subnet Calculator

  1. Enter an IP address with CIDR notation (e.g., 192.168.1.0/24)
  2. The tool instantly calculates all subnet properties
  3. View network address, broadcast address, subnet mask, host range, and total usable hosts

Frequently Asked Questions

Is IP Subnet Calculator free?

Yes, PivaBox IP Subnet Calculator is completely free. All calculations are done in your browser.

Are my IP addresses uploaded to a server?

No. All subnet calculations are done locally in your browser. Your data never leaves your device.

What CIDR prefixes does it support?

The calculator supports all standard CIDR prefixes from /0 to /32 for IPv4. It calculates the network address (first IP), broadcast address (last IP), subnet mask in both decimal (e.g., 255.255.255.0) and CIDR notation, total number of IP addresses, and the range of usable host addresses.