1/4/2023 0 Comments Subnetting chart![]() So, 1 in the first and last positions "turn on" 128 and 1.Īdd up all the positions to get the decimal number: 128 + 1 = 129 Let's use this binary number, for example: 10000001Įvery 1 in a binary number "turns on" the number in its position. Hence the term octet or the 8-bit number grouping. Note that there are eight numbers between the decimal points. The biggest IP address possible is 255.255.255.255 ![]() Why do octets only go up to 255? Because they're binary. These octets range in number from zero to 255. To make addresses more straightforward, they are divided into four 8-bit numbers - or octets - separated by a decimal point. Here's what an IP address looks like: 192.168.1.20Īn IPv4 address is a 32-bit number. To understand subnetting, you should first understand the decimal and binary structure of an IP address. A quick rundown of IP addresses and binary It's used to free up more public IPv4 addresses and segment networks for security and easier management. ![]() ![]() The quick definition: Subnetting is the process of taking a network and splitting it into smaller networks, known as subnets. ![]()
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