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IP Subnet Calculator

IP Subnet Calculator is a free online network tool that helps users calculate subnet details such as network address, usable IP range, subnet mask, CIDR notation, and total hosts for IPv4 and IPv6 networks.


IP Subnet Calculator

IP Subnet Calculator – Calculate Subnet Mask, CIDR & Host Range

IP Subnet Calculator is a fast and accurate online tool designed to perform subnetting calculations for both IPv4 and IPv6 addresses. It allows users to determine critical network details including network address, broadcast address, usable host range, subnet mask, prefix length, and total available hosts per subnet.

This tool works directly in the browser and does not require login, registration, or software installation. By entering an IP address along with a subnet mask or CIDR prefix, users can instantly understand how a network is divided and how many devices it can support.

Why Use IP Subnet Calculator?

Subnetting is essential for efficient IP address management, network segmentation, and performance optimization. IP Subnet Calculator helps simplify complex subnet calculations that are commonly required in networking, server configuration, firewall rules, and enterprise infrastructure planning.

The tool supports both traditional class-based networking concepts and modern CIDR-based subnetting. It is suitable for small networks, enterprise environments, and learning purposes where accurate subnet planning is required.

How IP Subnet Calculator Works

The calculator analyzes the provided IP address and subnet information to calculate the network prefix and host portion. It then generates the subnet mask, usable IP range, number of hosts, and related subnet details.

For IPv6, the tool calculates network prefixes using prefix length notation and displays valid address ranges according to IPv6 standards.

Common Use Cases

  • Calculating subnet masks and CIDR notation
  • Determining usable IP address ranges
  • Planning network segmentation and routing
  • Configuring firewalls and access rules
  • Designing enterprise or cloud networks
  • Learning subnetting concepts for exams or training

Frequently Asked Questions

What is a subnet?

A subnet is a smaller network created by dividing a larger IP network to improve efficiency and organization.

Does this tool support IPv6?

Yes, IP Subnet Calculator supports both IPv4 and IPv6 subnet calculations.

Is IP Subnet Calculator free?

Yes, the tool is completely free and browser-based.

What information does the calculator provide?

It shows subnet mask, CIDR prefix, network address, broadcast address, usable host range, and total hosts.

Who should use this tool?

Network administrators, IT professionals, students, developers, and system engineers can use this tool.

You can also explore other network and IP calculation tools available on AIBoostX for advanced planning and diagnostics.


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