Subnet Calculator

Divide a network into multiple equal subnets.

Parent block (CIDR)

Divide into /26 subnets

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What Is a Subnet Calculator?

The Subnet Calculator divides a parent IPv4 CIDR block into multiple equal smaller subnets and lists each resulting subnet with its network address, host range, broadcast address, and usable host count.

How to Use This Subnet Calculator

1
Enter a parent blockType a CIDR block such as 192.168.1.0/24.
2
Choose a subnet prefixSet the prefix for the subnets you want to create.
3
CalculateClick 'Calculate Subnets' and review each subnet in the list.

Frequently Asked Questions

The number of subnets equals 2 raised to the difference between the new prefix and the parent prefix. For example, dividing a /24 into /26 blocks yields four subnets.

A subnet with prefix /p has 2^(32-p) addresses, minus two reserved for the network and broadcast, leaving the usable host count.

This tool currently divides IPv4 blocks. Use the IPv6 Calculator for IPv6 subnet information.

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