Subnet Calculator And How To Use One

A Subnet Calculator is used by network or web admins to calculate subnets. While the majority of Internet users find no benefit to a subnet calculator online, others depend on it to make hard subnetting calculations much easier.

The Subnet Mask Calculator we have will enabled calculations regarding network class, subnet mask, bits, and IP address. Understanding how an IP address can be broken town and what the calculator is actually doing takes some thought also.

First consider an address of the Internet being a set of numbers like for example. This IPv4 address is a 32 bit integer and can be divided in two parts which is the network number and the host number. With the net mask included it will show the network number. In the past only three netmasks were used. Those netmasks were,, and for A, B, and C classed networks.

With so many new host devices coming online with Internet connectivity, mostly fueled by the use of smartphones and tablets, the need to have a larger scale of subnets became apparent. The idea to increase this ability of more Internet connected devices came through CIDR, or Classless Inter-Domain Routing and brought about the need for subnet calculators.

When using CIDR you can figure out what bits are used in a network and work out a calculation of a subnet down to a hexadecimal IP address and wildcard masks. A Subnet calculator can start with a mask of /25 which represents 25 bits. As you adjust your data inputs the calculator will adjust the outputs of your subnet calculations.

By taking a changed broadcast address and list all possible CIDR network examples you can see how subnetting works better. When you give a second netmask in your input, you will be able to display supernets when a larger demand requires it. Having easily understood binary values that makes subnetting easier to understand is the goal of our Subnet calculator.