IP Subnet Calculator
Calculate network ranges, broadcast addresses, and usable hosts from an IP address and CIDR prefix. Essential for network configuration and planning.
About the IP Subnet Calculator
The IP Subnet Calculator is an essential networking tool for system administrators, network engineers, and IT professionals. It takes an IP address and subnet mask (in CIDR notation) and calculates the complete network details including the network address, broadcast address, first and last usable host addresses, and total number of available hosts. This information is critical for network design, IP allocation, and troubleshooting.
Proper subnetting allows organizations to efficiently divide their network into smaller segments, improving performance, security, and management. This calculator helps you determine the correct subnet mask for a required number of hosts, identify which subnet an IP address belongs to, and plan IP address allocation for new network segments. It supports standard CIDR prefixes from /1 to /32.
Whether you are setting up a home network, configuring enterprise infrastructure, studying for networking certifications, or troubleshooting connectivity issues, this tool provides the accurate subnet information you need.
How to Use the IP Subnet Calculator
Calculate subnet details in these steps:
- Enter the IP address in dotted decimal format (e.g., 192.168.1.100).
- Enter the subnet mask in CIDR notation (e.g., /24) or dotted decimal (e.g., 255.255.255.0).
- Click Calculate to see the full subnet details.
- Review the network address, broadcast address, usable host range, and total hosts.
The calculator also shows the subnet in binary, which is useful for understanding how the mask divides the IP address. For network planning, enter different CIDR values to find the right subnet size for your required number of hosts.