Subnet Calculator

Calculate network details from an IP address and CIDR notation

IP Address / CIDR

Common Subnet Sizes

About This Tool

Enter an IP address with CIDR notation (e.g., 192.168.1.0/24) to calculate the network address, broadcast address, usable host range, and other subnet details. You can also enter a subnet mask in dotted decimal format (e.g., 192.168.1.0/255.255.255.0).

100% Client-Side Analysis

This tool runs 100% in your browser. No data is sent to any server.