How to Use the IP Subnet Calculator

Our completely free IP Subnet Calculator allows network engineers, sysadmins, and students to seamlessly split and calculate IPv4 network subnets. It processes complex binary mathematics in real-time, instantly providing your exact network boundaries.

Step-by-Step Guide:

• Step 1: Enter the IP Address. Type any standard IPv4 address into the input box (e.g., 192.168.1.50 or 10.0.0.1).
• Step 2: Select Your Subnet Mask. Use the dropdown menu to choose your desired CIDR block. The dropdown conveniently displays the CIDR notation (like /24), the decimal mask (255.255.255.0), and the total number of usable hosts it provides.
• Step 3: Calculate. Click the blue calculation button to instantly generate your exact Network Address, Broadcast Address, and your safely usable IP range for assigning to computers and routers.

Subnetting Terminology Guide

• Network Address: The very first IP in the subnet. It represents the network itself and cannot be assigned to a computer.
• Broadcast Address: The very last IP in the subnet. It is used to send data to every device on the network simultaneously and cannot be assigned to a computer.
• Usable Host Range: Every IP address sitting between the Network and Broadcast address. These are the IPs you can actively assign to laptops, servers, and phones!
• CIDR Notation: Classless Inter-Domain Routing (CIDR) is simply a shorthand way of writing a subnet mask (e.g., /24 instead of 255.255.255.0).