Calculate network address, broadcast address and host range

Network administrators use it to verify the network address, broadcast address and host range before configuring a subnet.

Calculate the network address, broadcast address and host range. Everything runs in your browser, so no input is uploaded or stored.

How to use

Type an IP address with its CIDR prefix, for example 192.168.1.42/24.
Run the calculation to display the details of the matching subnet.
Read the network address, broadcast address and usable host range.
Check whether the address you entered belongs to the range you plan to use.
Copy the useful values into your addressing plan, documentation or configuration.

Example

With the sample 192.168.1.42/24, review the network address, broadcast address and host range. This helps confirm that a device planned for that subnet will receive a coherent address.

Input

192.168.1.42/24

Limits and formats

The calculator handles IPv4 CIDR addressing and does not configure any network device.
The host range depends on the prefix, so a wrong prefix changes the whole subnet split.
Check reserved or already used addresses in your plan before assigning one.
The tool does not replace a network scan and cannot tell whether an address is already active.

Where processing happens

The computation happens in your browser. The address you enter is not sent outside, and the page does not keep a record of your request. You can test several prefixes one after another.

Frequently asked questions

What do the network and broadcast addresses mean?

The network address identifies the subnet itself, while the broadcast address reaches all hosts in it. The usable host range usually sits between those two values.

Can I calculate a private IP address?

Yes, private addresses work well for local addressing plans. The tool performs the CIDR split without connecting to your network or querying your devices.

Does the calculator detect address conflicts?

No, it only provides the subnet boundaries. You still need to compare the result with your inventory to avoid assigning an address that already exists elsewhere.