IPv4 Subnet Calculator & CIDR Range Planner

Calculate IPv4 network address, broadcast, netmask, wildcard, and usable host ranges from CIDR prefix.

About this tool

Design cloud VPC networks, subnets, and firewall rules with precise bitwise IPv4 calculations.

How to use this tool

  1. Enter an IPv4 address with CIDR notation (e.g. 192.168.1.0/24 or 10.0.0.1/16).
  2. Click Run Subnet Calculator.
  3. Inspect the network address, broadcast address, and usable host count.

How it works

Performs 32-bit bitwise AND/OR operations between IPv4 octets and CIDR prefix masks to compute network boundaries.

When to use this tool

  • Architecting AWS, GCP, or Azure VPC subnets.
  • Network administrators dividing IP address allocations.

Frequently asked questions

What is the usable host count for a /24 subnet?

A /24 subnet has 256 total IP addresses and 254 usable host addresses.

Limitations

Supports IPv4 addresses (0.0.0.0 to 255.255.255.255).

Privacy

Network IPs are calculated in local browser memory.