IP Subnet Calculator

Calculate subnet masks, network addresses, broadcast addresses, and more for any IP address and subnet. Essential tool for network administrators and developers.

Calculate Subnet Information

IP Address

Subnet Mask

Subnet Information

Network Address

Broadcast Address

Usable Host Range

Total Hosts

Usable Hosts

Wildcard Mask

What is IP Subnetting?

Understanding the fundamentals of IP subnetting and why it's essential for network management

IP subnetting is the process of dividing a single network into smaller, more manageable sub-networks (subnets). This technique allows for better organization of network resources, improved security, and more efficient use of IP addresses.

Subnetting is crucial for network administrators as it helps in:

Reducing network congestion by limiting broadcast domains
Improving network security by isolating segments
Optimizing IP address allocation
Enhancing overall network performance

Our IP Subnet Calculator simplifies the complex calculations involved in subnetting, making it accessible to both beginners and experienced network professionals.

Network Subnetting Example

Main Network: 192.168.0.0/16

Subnet A: 192.168.1.0/24

Subnet B: 192.168.2.0/24

Subnet C: 192.168.3.0/24

How to Use the IP Subnet Calculator

Follow these simple steps to calculate subnet information

Enter IP Address

Input the IP address you want to calculate subnet information for. Make sure to use the correct format (e.g., 192.168.1.1).

Select Subnet Mask

Choose the appropriate subnet mask from the dropdown menu. The calculator supports both CIDR notation and traditional subnet masks.

Calculate

Click the "Calculate Subnet" button to instantly get detailed information about the network, including addresses and host ranges.

Review Results

Examine the calculated subnet information, including network address, broadcast address, usable host range, and more.

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Why Use Our IP Subnet Calculator?

Our calculator offers unique features that make subnet calculations simple and accurate

Instant Results

Get subnet information instantly with our optimized calculation engine.

Privacy Focused

All calculations happen locally in your browser. We never store or transmit your data.

Fully Responsive

Access our calculator on any device - desktop, tablet, or mobile.

User-Friendly Interface

Clean, intuitive design that makes subnet calculations accessible to everyone.

Completely Free

All our calculators are 100% free to use with no hidden costs.

Detailed Information

Get comprehensive subnet details including network address, broadcast address, and host ranges.

Frequently Asked Questions

Find answers to common questions about IP subnetting and our calculator

What is a subnet mask?

A subnet mask is a 32-bit number that masks an IP address and divides it into network and host addresses. It's used to determine which part of an IP address is the network portion and which part is the host portion.

What is CIDR notation?

CIDR (Classless Inter-Domain Routing) notation is a compact representation of an IP address and its associated routing prefix. It's written as an IP address, followed by a slash, and then the number of bits in the network part (e.g., 192.168.1.0/24).

What is the difference between network address and broadcast address?

The network address is the first address in a subnet and identifies the network itself. The broadcast address is the last address in a subnet and is used to send data to all devices on that network simultaneously.

How many usable hosts are in a /24 subnet?

A /24 subnet (255.255.255.0) has 256 total IP addresses. The first address is the network address, and the last is the broadcast address, leaving 254 usable host addresses.

Why is subnetting important?

Subnetting is important because it reduces network congestion, improves security by isolating network segments, optimizes IP address allocation, and enhances overall network performance and management.