Network Calculator

Advanced IPv4 Subnetting Tool for Network Professionals

Subnet Calculator

About Network Subnetting

What is Subnetting?

Subnetting is the practice of dividing a network into smaller network sections called subnets. This helps with network management, security, and efficient use of IP address space. Our calculator helps you determine all critical parameters for any given IP address and subnet mask combination.

Key Features

  • Supports both traditional (255.255.255.0) and CIDR (/24) notation
  • Calculates network and broadcast addresses
  • Determines usable host range
  • Handles special cases like /31 and /32 networks
  • Shows total number of available hosts

How to Use

  1. Enter your IP address (e.g., 192.168.1.10)
  2. Enter subnet mask (e.g., 255.255.255.0 or /24)
  3. Click "Calculate" to see all subnet information
  4. Use results for network configuration

Understanding the Results

Network Address

This is the first address in the subnet and identifies the network itself. It cannot be assigned to any device.

Broadcast Address

The last address in the subnet used for broadcasting messages to all devices on the network. Cannot be assigned to a host.

Usable Host Range

These are the IP addresses that can actually be assigned to devices (routers, computers, etc.) on your network.

Frequently Asked Questions

What's the difference between CIDR and traditional subnet mask?

CIDR (Classless Inter-Domain Routing) notation is a compact representation of the subnet mask that shows the number of network bits. For example, /24 is equivalent to 255.255.255.0. Our calculator accepts both formats.

Why does a /31 network show 2 hosts?

/31 networks are a special case used for point-to-point links where only two addresses are needed (one for each end of the link). These networks don't have a network or broadcast address in the traditional sense.

What is a /32 network used for?

A /32 network represents a single host address. This is often used for loopback interfaces or when you need to reference a single specific host in routing configurations.