Developer & Networking
CIDR Calculator
Convert CIDR notation to subnet masks, IP ranges, host counts, wildcard masks, and binary representations.
FREE INSTANT RESULTS NO SIGNUP UPDATED 2026
Parameters
Summary Output
CIDR IP Range
192.168.1.0 - 192.168.1.255
Subnet Mask
255.255.255.0
Total Addresses
256
Usable Hosts
254
Wildcard Mask
0.0.0.255
Binary Subnet Mask
11111111.11111111.11111111.00000000
Visual Breakdown
Schedule Breakdown
How to Use
Enter any base IP address and select a CIDR prefix length from the dropdown. The calculator converts the CIDR block into its full IP range, subnet mask, wildcard mask, host count, and binary mask representation.
Example Calculation
For 192.168.1.0/24: Range = 192.168.1.0 − 192.168.1.255, Subnet Mask = 255.255.255.0, Total = 256, Usable = 254, Wildcard = 0.0.0.255, Binary = 11111111.11111111.11111111.00000000.
Formula
Subnet Mask = 0xFFFFFFFF << (32 − prefix)\nTotal Addresses = 2^(32 − prefix)\nUsable Hosts = Total Addresses − 2 (for prefix ≤ 30)\nWildcard Mask = NOT Subnet Mask\n\nBinary Mask = each octet of mask converted to 8-bit binary representation
Frequently Asked Questions
Common questions and answers about the CIDR Calculator.
The CIDR Calculator is a free online tool designed to convert cidr notation to subnet masks, ip ranges, host counts, wildcard masks, and binary representations. It allows you to perform these calculations quickly and accurately without manual computations.
Enter any base IP address and select a CIDR prefix length from the dropdown. The calculator converts the CIDR block into its full IP range, subnet mask, wildcard mask, host count, and binary mask representation. Once you enter these values, the calculator will automatically compute and display the results instantly.
The CIDR Calculator uses the following formula to calculate your results:
Subnet Mask = 0xFFFFFFFF << (32 − prefix)\nTotal Addresses = 2^(32 − prefix)\nUsable Hosts = Total Addresses − 2 (for prefix ≤ 30)\nWildcard Mask = NOT Subnet Mask\n\nBinary Mask = each octet of mask converted to 8-bit binary representation
This formula is standard and widely accepted for these types of calculations.
Sure! Here is a practical example:
For 192.168.1.0/24: Range = 192.168.1.0 − 192.168.1.255, Subnet Mask = 255.255.255.0, Total = 256, Usable = 254, Wildcard = 0.0.0.255, Binary = 11111111.11111111.11111111.00000000.
This example demonstrates how the inputs are processed through the formula to yield the final results.
To use the CIDR Calculator, you need to enter: Base IP Address, CIDR Prefix Length. These inputs help the tool calculate precise results tailored to your situation.
The CIDR Calculator outputs the following details: CIDR IP Range, Subnet Mask, Total Addresses, Usable Hosts, Wildcard Mask, Binary Subnet Mask. This comprehensive breakdown helps you understand the different aspects of the calculated figures.
Yes, the CIDR Calculator is 100% free with no registration or signup required. It is fully responsive and optimized for mobile phones, tablets, and desktop computers.
Reliable Calculator provides a fast, clean, ad-free, and premium user experience. The CIDR Calculator uses verified math formulas and provides instant results with visual breakdowns and examples, making it more intuitive than other tools.
Categories
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