![]() Each part of the address is also known as an octet, since each octet represents eight(8) bits. These zeros and ones are also known as binary dig its or simply bits. 00011101Įxample 11b: The same IPv4 address as in example 11a (in dotted decimal notation)Īs discussed earlier, in example 11a, the binary format of an IPv4 address has four (4) parts and each part is represented by zeros(0) and ones(1). To explain how a subnet mask works, lets recall the IPv4 addresses discussed earlier.Įxample 11a: An IPv4 address (in binary format)ġ1000000. Without a corresponding subnet mask it would be difficult to identify which computer(device) a given IPv4 address belongs to. To reiterate, an IPv4 address has two(2) distinct components, a network portion and a host portion. The corresponding subnet mask is used to separate these two portions. Also, a host means a computer, a cell phone, a PDA or some kind of a network device or an interface that is connected to the network. It is important to note that, each IPv4 address has a corresponding subnet mask. Therefore, in an IPv4 address of a computer, the network portion indicates where the computer is physically located, and the host portion uniquely identifies the computer itself. Similarly, the technical term that is used to describe the specific part of an address is called the host portion of the address. In IPv4 addressing, the technical term that is used to describe the general part of an address is called the network portion of the address. It merely indicates the length, from leftmost-to-right, of the general part of the address and doing so makes the specific part of the address obvious. #Subnet mask table for class b how to#Today i will explain how to find subnet mask from IP address ? In functionality, it works like an Address Separator discussed earlier. The IPv4 Subnet Mask, also referred to interchangeably as just subnet mask or netmask, is a part of IPv4 addressing. ![]()
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