A broadcast address can be described as an IP address that can be used to point to all systems on a specific subnet address as a whole, opposed to just that single machine. The broadcast address can be calculated quite easily, as long as the user is aware of how to calculate the subnet mask, and also the use of OR and AND operators. OR is used for the subnet mask, and OR is used for actually calculating the broadcast address.

There are two different ways that a system can broadcast. Systems that derived from BSD typically use 0’s in their broadcasts instead of 1’s in the broadcast. All this means is that when creating a broadcast address, the host area of your IP address will display 0’s as the binary value instead of 1’s.

Should you ever decide to change the way your broadcast address shows (with either 0’s as a display or 1’s), please keep the general precautions in mind. These are that changing the address can and most likely will cut off certain connections with any local devices. This is because the device is told to look for the specific IP address with say 0’s in it, but it you change the address to broadcast in 1’s, then the machine become lost. Always keep in mind the devices you’ll need to change the settings of before you decide to change the broadcast.

How to set up a broadcast address on Windows

Windows actually will not let you manually change the broadcast address, but it will let you change whether or not it broadcasts in 0’s or 1’s. To do this, simply login to the Windows system and open up the registry editor. This can be accomplished by opening up “Run” and typing in “regedit”. Then find the following registry key:

HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\ Tcpip\Parameters\Interfaces\[ID of Adapter you're looking for]

From here, create a new “DWORD” value in the ID settings. Name it “UseZeroBroadcast”, with an initial value of 1. This will set the adapter to broadcast with 0’s instead of 1’s as a default. In order for the changes to take effect, you must reboot your computer.

How to calculate your broadcast address

Broadcast Address Calculator

This calculator does all of the aforementioned steps, but much faster than any human could perform them naturally. It can take out some of the more tedious steps involved, and it also a good alternative for those who are exactly sure how to calculate it manually. Manually calculating the address not only takes longer, but is also more prone to yielding an incorrect answer. Using a calculator is actually a suggested method.

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