Subnet Calculator

Calculate subnet details, network ranges, and usable IP addresses

Network Address:

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Broadcast Address:

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First Usable IP:

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Last Usable IP:

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Total Hosts:

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Usable Hosts:

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Network Bits Host Bits
0 network bits / 0 host bits

How to Use

Basic Calculation

Enter an IP address and subnet mask (in dotted notation like 255.255.255.0 or CIDR like /24) to calculate network details, usable IP range, and visualize the network/host bits.

Advanced Subnetting

After basic calculation, you can specify how many subnets you need or how many hosts per subnet, and the calculator will show you how to divide your network.