That is because 192 is written as 11000000. This classification means how many of the 1st four bits of the first octet in the IP address are 1.We can illustrate this in the table below.įor example, for an IP address in a type C network, like 192.168.1, the first octet is 110xxxxx. IP addresses are of either class A, B, C, D, or E. Obviously you can easily see that if the devices in your home network all look like 192.168.1.x then the network portion of that address is 192.168.1. Having a subnet tiedto an IP address is supposed to speed up a router by having it check fewer possibilities. The reason that the highest octet value is 255 is that IP addresses are given in bits, which are the power of 2.The maximum number you can write with bit notation is with 8 1’s or 11111111=255.This notation 11111111 is powers of 2, since each bit can be a 0 or a 1. Let’s call each group an octet as it is 8 bits. So if your kid is downloading movies from Pirate Bay tell them to stop that as you could get blamed.)Īn IP address is broken into four decimal numbers ranging from 0 to 255 and arranged into groups like this. What that means is all of the people visiting websites in your house all have the same IP address. That’s what gets recorded in web server logs when you go visit web sites. Then each device in your house is given an IP address in the 192.168.1.xxx range, like 192.168.1.2.(Your router has a public internet address too, like 212.12.34.12. The Linksys router that you plugin to your cellular modem is given an IP address, of say, 192.168.1.1, by Linksys when they manufacture it. That is just a convention that has become common. The majority of home computers on home networks have IP addresses like 192.268.1.xxx. But not all networks are virtual networks.įor example, the one in your house is what is called a flat network. That would be especially true in the cloud where each customer would want to have no restrictions on what number they use for the subnet and would want to be able to set up networking in the way they already understand and are comfortable with. That might be why we see 255.255.255.0 all the time. There is supposed to be only one subnet per network, but something called VLANS (virtual LANS) have let network engineers ignore that requirement and reuse them all they want. Basically a subnet is used to tell a router to which network an IP address belongs.
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