CIDR Calculator
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Network Information
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:
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What exact IP range does this block cover?
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How many usable IP addresses are available?
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What are the network address, broadcast address, and the first and last usable IPs?
FAQ
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
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.
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.
