CIDR Calculator – IP Range and Subnet Mask Calculator

CIDR Calculator

IP Address

Subnet Mask / CIDR

Binary Display Subnetting

Results

Network Information

Network Address: -

Broadcast Address: -

First Usable IP: -

Last Usable IP: -

Total Number of Hosts: -

Number of Usable Hosts: -

Binary Display

IP Binary: -

Subnet Mask Binary: -

Subnetting

What Is a CIDR Calculator and What Does It Do?

CIDR (Classless Inter-Domain Routing) is a method used to divide IP addresses more flexibly and efficiently.
In the past, IP blocks were assigned using fixed classes (A, B, C), but that system was inefficient. With CIDR, you can define address ranges more flexibly, such as 192.168.1.0/24.

The CIDR Calculator helps you quickly answer questions like:

What exact IP range does this block cover?

How many usable IP addresses are available?

What are the network address, broadcast address, and the first and last usable IPs?

FAQ

What Does the CIDR Calculator Show?

Based on the CIDR block you enter, it displays:

The IP range
Network address
Broadcast address
First and last usable IP addresses
Total number of IPs and number of usable IPs

What Does CIDR Mean?

CIDR is a format that represents IP addresses using a slash (/). For example, 192.168.0.0/24 represents a block containing 256 IP addresses.

Is the CIDR Calculator Secure?

Yes. This tool runs entirely in your browser. The IP blocks you enter are not sent anywhere. All calculations are done locally on your device.

Network Information

Binary Display

Subnetting

What Is a CIDR Calculator and What Does It Do?

FAQ

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