IP & CIDR calculator

Put it to work

Calculate IPv4/IPv6 networks and address ranges.

From input to output

Open IP & CIDR calculator and load the example.
Read the format notes, choose your options, and replace the example with your input. Start with test data instead of sensitive information.
Run the tool and inspect the result and status. If an error appears, correct the input format and run it again.
Copy the output or download a file. Generated and converted results are not saved automatically.

Calculate IPv4/IPv6 networks and address ranges. IPv4 /31 uses two addresses; /32 uses one. IPv6 has no broadcast address.

Example input

192.168.1.10/24

Reading the result

network: 192.168.1.0
mask: 255.255.255.0
broadcast: 192.168.1.255
firstHost: 192.168.1.1
lastHost: 192.168.1.254
usableAddresses: 254

Details that matter

Format and meaning

IPv4 /31 uses two addresses; /32 uses one. IPv6 has no broadcast address.

Supported scope and limits

Text 1 MB

Split inputs that exceed the limit. If a format or algorithm is unsupported, choose a tool that matches your requirements instead of silently changing the format.

What happens to your data?

Tools run in your browser. DNS lookup sends the queried domain to the named external provider. Ads may appear on home, guide, and workspace pages according to settings.

Open tool

Put it to work

From input to output