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IPv4 CIDR Calculator for Subnet Masks and IP Ranges

Enter an IPv4 address and prefix such as 192.168.1.42/24 to find the network address, subnet mask, broadcast address and usable host range.

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Input and settings

LOCAL

IPv4 CIDR block

Network: 192.168.1.0
Mask: 255.255.255.0
Broadcast: 192.168.1.255
Address range: 192.168.1.0 – 192.168.1.255
Usable range: 192.168.1.1 – 192.168.1.254
Usable addresses: 254

Getting started

Enter an IPv4 address and prefix length such as 192.168.1.42/24.

Before you use the result

IPv6 and routing policy are outside this IPv4 calculator.

Try an example

192.168.1.42/24 maps to 192.168.1.0–255.

How it works

Bit masks determine network and broadcast addresses.

Frequently asked questions

Find the network, broadcast and address range of an IPv4 CIDR block.

How do I use IPv4 CIDR Subnet Calculator?

Enter an IPv4 address and prefix length such as 192.168.1.42/24.

Does this tool upload my data?

Inputs and files are processed in your browser. Page-view analytics do not contain your tool input.

What should I check before using the result?