Subnetting

Definition - What does Subnetting mean?

Subnetting is the strategy used to partition a single physical network into more than one smaller logical sub-networks (subnets). An IP address includes a network segment and a host segment. Subnets are designed by accepting bits from the IP address's host part and using these bits to assign a number of smaller sub-networks inside the original network. Subnetting allows an organization to add sub-networks without the need to acquire a new network number via the Internet service provider (ISP). Subnetting helps to reduce the network traffic and conceals network complexity. Subnetting is essential when a single network number has to be allocated over numerous segments of a local area network (LAN).

Subnets were initially designed for solving the shortage of IP addresses over the Internet.

Techopedia explains Subnetting

Each IP address consists of a subnet mask. All the class types, such as Class A, Class B and Class C include the subnet mask known as the default subnet mask. The subnet mask is intended for determining the type and number of IP addresses required for a given local network. The firewall or router is called the default gateway. The default subnet mask is as follows:

  • Class A: 255.0.0.0
  • Class B: 255.255.0.0
  • Class C: 255.255.255.0
The subnetting process allows the administrator to divide a single Class A, Class B, or Class C network number into smaller portions. The subnets can be subnetted again into sub-subnets.

Dividing the network into a number of subnets provides the following benefits:

  • Reduces the network traffic by reducing the volume of broadcasts
  • Helps to surpass the constraints in a local area network (LAN), for example, the maximum number of permitted hosts.
  • Enables users to access a work network from their homes; there is no need to open the complete network.

Posted by:

Connect with us

Techopedia on Linkedin
Techopedia on Linkedin
Tweat cdn.techopedia.com
Techopedia on Twitter


'@Techopedia'
Sign up for Techopedia's Free Newsletter!
Techwise Webinar Series
How Can Analytics Improve Business?
Register for this episode of TechWise to learn from two of the most experienced analysts in the business: Dr. Robin Bloor, Chief Analyst of The Bloor Group, and Dr. Kirk Borne, Data Scientist, George Mason University.

Email Newsletter

Join 138,000+ IT pros on our weekly newsletter

Resources
Free Whitepaper – Bridging the IT Operations Application Owner Gap
Free Whitepaper – Bridging the IT Operations Application Owner Gap:
Conflicting organizational needs all too often create tension between functional silos. Application owners demand more and more resources.
Free 30 Day Trial – VMTurbo Operations Manager
Free 30 Day Trial – VMTurbo Operations Manager:
VMTurbo's flagship product, Operations Manager maintains your virtual and cloud environments in a healthy state. It manages homogeneous and...