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Now look at the subnet mask examples again.ĭo you see why both subnet masks are the same? The number 24 is the number of bits used in the network portion of the address, and is If you count all the ones, you will find that there are 24 of them. So our decimal subnet mask 255.255.255.0 displayed in binary is Eight bits is an octet.ġ1111111 in binary is 255 in decimal (did you do the conversions?). We call each of the number sections an octet because we think of them in binary, and there are eight possible bits in each section. This because of the 0 in the subnet mask (255.255.255. This means we can have 254 computers on this network, because the fourth octet is not being used by the network portion of the address. Network number represents the street I live on, and the host portion is used for the numbers on all the houses on my street.Ī subnet mask of 255.255.255.0 means that the first three octets of the address will be used for the network, and thus our network number isġ92.168.1. Because I am a simple person, I think of it like this The What portion of the TCP/IP address represents your network and what portion can be used for your hosts. You have a network and you have hosts on the network (anything with an IP address is a host). Now that you understand what binary is, let's have a look at our two subnet masks from the beginning of my post: If you were able to convert these numbers to decimal then congratulations! You're ready to move on to the next section. Here is a list of binary numbers, try converting them to decimal and check your answers at the end of this post. Let's look at the decimal number Let's look at the decimal number 103 in binary format:

Multiplying each number place by 2 gives you the next number place. We say the number places are grouped by 2's because The binary system has aġ's place, a 2's place, a 4's place, an 8's place, a 16's place and so on. Understand the concept of what a number system is, and what it is based on before we look at binary.īinary is a base 2 system, and thus groups numbers by 2's and not by 10's like the decimal system. Let's look at the decimal number 103 by place.īy now you probably feel like you have attended Kindergarten for the second time in your life? Sorry about that but it is very important that you Multiplying each number place by 10 gives you the next number place. We say the number places are grouped by 10's The decimal system has a 1's place, a 10's place, a 100's place, a 1000's place and so on. We name the ten digits: zero, one, two, three, four, five, six, seven, eight and Which over the years we have used for counting. It is believed that the system evolved because we have ten fingers and ten toes System a base 10 system is that it is based on grouping numbers by 10's. The first thing you must know is that the common number system used world wide is the decimal system (otherwise known as base 10). Quick Subnetting How-To (Thanks to decimal - Base 10]