What Is Subnetting And Why Should You Use It

what is subnetting and why should you use it.

Hearing the word Subnetting does sound strange to us but not to IT consultants. Simply put, subnetting is the process of dividing one large network into several smaller networks. The following is a more complete explanation of What is Subnetting and why do we need to use it?

What is Subnetting

Subnetting is a strategy used to partition a single physical network into more than one smaller logical subnet (subnet). The IP address includes the network segment as well as the host segment. Subnets are designed by accepting bits from the host portion of the IP address and using these bits to define several smaller sub-networks within the original network.

Subnetting allows an organization to add sub-networks without needing to obtain a new network number through an Internet service provider (ISP). Subnetting helps reduce network traffic and hides network complexity. Subnetting is especially meaningful when a single network number must be allocated across multiple local area networks (LAN) segments

So simply Subnetting is a process that allows administrators to divide the number of Class A, Class B, or Class C networks into smaller parts and the subnets can be changed again into sub-subnets.

Why Use Subnetting

An organization can use IP subnets to share larger networks for several reasons including firewalls or physical requirements such as smaller broadcast domains. In other words, routers use subnets to make routing choices. Subnetting can also improve network security.

By sharing between subnets, a company or organization can control who has access. Subnetting also helps relieve network congestion and also serves to redistribute network capacity and allows data packets to flow directly to their intended destination without having to go through a single bottleneck.

Subnetting Function

1. IP Address Reallocation

Internet addresses are allocated by InterNIC, the organization that manages the Internet. These IP addresses are divided into classes. The most common are classes A, B, and C. Each class has a limited number of host allocations, for example, networks that have more than 254 device requires Class B allocation.

If network administrators are working with a Class B or C Network and need to allocate 150 hosts to three physical networks located in three different cities, they will need to request more address blocks for each network or divide the network into subnets that allow the administrator to use one address block at a time. some physical network.

2. Eliminate Network Congestion

If a lot of packet traffic is running and you intend to share it regularly between the same group of computers, placing them on the same subnet can reduce network traffic. Without a subnet, all computers and servers on the network would see data packets from every other computer. When traffic is directed to the right port, it slows down.

3. Improve Network Security

Subnetting allows network administrators to mitigate network-wide threats by quarantining agreed-upon portions of the network and by making it more difficult for intruders to move around your network.

Subnetting Analogy

To make it easier to understand subnetting, let's make an analogy that there is a street called Gatot Subroto consisting of several houses numbered 01-08, with house number 08 being the house of the RT head who has the task of announcing any information to all houses in the Jl. Gatot Subroto.

When there are more houses in the area, of course, it is likely to cause traffic jams. Therefore, another arrangement was made, alleys were made, houses that entered the alley were given a new house number, each alley had its own RT head. So that this will solve congestion, efficiency, and optimization of transportation, and each aisle has its own privilege in managing its territory.

Jl. Gatot Subroto with houses around him can be applied to networks such as NETWORK ADDRESS (street name) and HOST ADDRESS (house number). Meanwhile, the Head of the RT is played as BROADCAST ADDRESS, who is in charge of sending messages to all hosts on the network.

So what is a subnet mask? Subnet mask is used to read how we divide roads and alleys, or divide networks and hosts. Subnet mask is also used for us to know which addresses function as SUBNET, HOST, and BROADCAST. But for example, if there is also a road in another residential area that does not have an alley, it means that we are using the Default Subnet mask, or in other words, it can also be said that the network does not have a subnet (a road without an alley).


So What Is Subnetting? Subnetting, or subnetwork, is the process of splitting a single large network into two or more strands. This means that very large and heavy networks can be further subdivided into smaller, more localized networks.

Hopefully, this article about What Is Subnetting And Why Should You Use It, gives you a little insight. Also, read an article about What is the Dark Web that you may need to know. Thank you.

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