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CIDR Calculator

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Converts between CIDR notation, subnet masks, and IP address ranges for network planning.

How To Use

How to use this calculator

Start with your values, or try a preset.

Step 1

Enter CIDR Notation (/) in the units shown.

Step 2

Read Number of Usable Hosts, IP Range (Example), Broadcast Address (Example), Network Address (Example), and Subnet Mask in the results panel. Results update as you change the inputs.

Step 3

Choose a preset to load an example, then adjust the values for your situation.

Worked Examples

Example calculations

See the inputs and their calculated results.

Class C (/24)

CIDR Notation (/): 24

Number of Usable Hosts: 254 hosts; IP Range (Example): 192.168.1.1 - 192.168.1.254; Broadcast Address (Example): 192.168.1.255; Network Address (Example): 192.168.1.0; Subnet Mask: 255.255.255.0

Class B (/16)

CIDR Notation (/): 16

Number of Usable Hosts: 65,534 hosts; IP Range (Example): 192.168.0.1 - 192.168.255.254; Broadcast Address (Example): 192.168.255.255; Network Address (Example): 192.168.0.0; Subnet Mask: 255.255.0.0

Class A (/8)

CIDR Notation (/): 8

Number of Usable Hosts: 16,777,214 hosts; IP Range (Example): 10.0.0.1 - 10.255.255.254; Broadcast Address (Example): 10.255.255.255; Network Address (Example): 10.0.0.0; Subnet Mask: 255.0.0.0

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