IPv4 Subnet & CIDR Calculator
Free in-browser IPv4 Subnet and CIDR Calculator. Calculate comprehensive network architecture metrics for any IP and CIDR prefix (/1 to /32): Network Address, Broadcast IP, Subnet Mask, Wildcard Mask, Usable Host IP Range, Total/Usable Hosts, IP Class (A, B, C, D, E), RFC 1918 Scope (Private vs Public), and 32-bit binary octet matrix breakdowns with 1-click clipboard copying.
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How to Calculate Subnets in 3 Steps
Enter IP Address
Input your IPv4 address (e.g. 192.168.1.1 or 10.0.0.1).
Select CIDR Prefix
Use the slider or quick buttons to select prefix (/24, /16, /28, etc.).
Inspect & Copy Network Data
Instantly view and copy subnet mask, usable IP range, and binary breakdown.
Frequently Asked Questions
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