What is an IP Subnet Calculator?
A Subnet Calculator is a crucial tool for network administrators, IT professionals, and students to quickly perform IP subnet math. It takes an IP address and a routing prefix (CIDR) or subnet mask, and instantly calculates the network boundaries.
Why is Subnetting Important?
Subnetting divides a large network into smaller, more manageable sub-networks. This improves network performance by reducing broadcast traffic, enhances security by isolating groups of hosts, and conserves IP addresses by allocating only the necessary amount of hosts per department.
How to Use This Tool
100% Offline and Private
For security professionals, entering sensitive network topologies into a web tool can be a risk. This Subnet Calculator is built using client-side JavaScript. It runs 100% in your browser without sending any IP addresses or network configurations to a server. Your data remains strictly on your device.