![]() ![]() Most operating systems and networking hardware assume that subnetting is being used (because it is so awesome). The following table gives you a subnet cheat sheet that summarizes these defaults:Įven if you do not plan to go outside of the default IP classes, you may need to express you network using a subnet mask. They always start with 255, which is not a valid first octet for any class of IP address.Įach class of IP address has its own default subnet mask. You can easily spot a subnet mask when it is represented in dotted-decimal notation. It just tells the router which portion of an IP address it should use to figure out the network ID. It doesn’t uniquely identify any device or network. Keep in mind that the subnet mask is not the same thing as an IP address. The subnet mask is always a string of ones on the left followed by a string of zeroes on the right. The more host bits you have, the more devices that can connect to your subnet at the expense of the total number of sub networks you can set up, and visa-versa. A subnet mask works like a filter with the mask identifying the IP address bits that represent the network ID with a 1, and the bits that represent the host ID with a 0. This trick is accomplished using a subnet mask, another 32-bit number. ![]() Creating multiple networks partitions allows you to confine traffic and network breaches or virus outbreaks.Ī subnet mask defines which chunk of an IP address is the host ID and which portion is the subnet network ID.
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