Subnet Calculator (IPv4 Only)

Example: "10.0.0.1 255.255.252.0"

What is IPv4 Subnet Calculator

Subnet Calculator is used to divide an IP network into subnetworks by calculating network address, subnet mask, broadcast address and host IP address range. Please use the form below to enter an IP address and Subnet Mask, and we'll provide you with necessary information you'll need.

Subnet mask calculator

With subnet mask you can split your network into subnets. Enter your IP address and play with the second netmask until the result matches your need.

Notes about the Subnet Calculator

This is a more straightforward and faster IP subnet calculator, giving you a complete list of information concerning an IP address and Subnet Mask, including the Network and Host address size.

NOTE: To determine range in which an IP address falls enter address and subnet mask (as dotted decimals) in fields above and press "Calculate". (Requires a version 4.x browser or higher).

The subnet calculator implements a classful / classed IP addressing scheme where the following rules are adhered to:

Class A addresses have their first octet in the range 1 to 126 (binary address begins with 0).

Class B addresses have their first octet in the range 128 to 191 (binary address begins with 10).

Class C addresses have their first octet in the range 192 to 223 (binary address begins with 110).

The subnet calculator allows the use of a single subnet bit - for example, a class C address with a subnet mask of 255.255.255.128 is permitted.

The subnet calculator allows a subnet ID to have its final octet equal to the final octet of its subnet mask - for example, a class C network address of 192.168.0.192 with a subnet mask of 255.255.255.192 is permitted.