What is IP Subnetting? How to Subnet IP Network Addresses

This post was originally published on Network Computing

What is IP Subnetting?

Every device on an IP network must have a unique IP address associated with it in order to communicate with others. Within enterprise networks, not only are IP addresses used, groups of IP addresses are commonly grouped into individual subnets that achieve a number of performance, scalability, and security benefits.

IP subnetting works to logically segment a larger network into smaller, more manageable subnetworks. This requires not only a unique IP address but also subnet masks and default gateways to achieve proper connectivity. In this document, we’ll explain the purpose of IP subnets, how to read them, along with best practices for creating and deploying multiple subnets within your organization.

Why do you need to subnet IP Networks?

There are a number of reasons why a network would require multiple IP subnets. Here are a few of the top benefits:

1. To create smaller networks within a large network

From an organizational standpoint, network administrators can create IP subnets that group similar devices together for improved management and visibility. For example, an organization may create an IP subnet that is for wired end devices with a separate subnet for application servers that reside in

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