Vlsm Online Calculator

0 views

Skip to first unread message

Boleslao Drinker

unread,

Aug 3, 2024, 5:01:38 PM8/3/24

to inleamogir

Using CIDR/VLSM this calculator allows you to quickly figure out how to most efficiently setup your network. If you are using IPv6 you can use our IPv6 subnetting calculator to efficiently setup those addresses.

Variable length subnet masking (VLSM) is a more efficient way of subnetting a network. When you perform classful subnetting, all the subnets must use the same subnet mask, forcing them to each use the same number of hosts. This can lead to wasted IP space.

Classless Inter-Domain Routing (CIDR) has replaced the classful network design. Subnets no longer have to all be the same size. Network architects can now create multiple subnets all of which vary in size and subnet mask.

VLSM allows you to use different subnet masks, allowing for a more exact number of hosts to be used in each subnet. To perform VLSM subnetting, starting with the largest number of hosts needed in a single subnet, find the smallest subnet which will have that many hosts. Then do the same for the subnet needing the second largest number of hosts, all the way down to the smallest number of hosts needed.

If you want to learn more about networking and get the Cisco CCNA certification, we highly recommend the Cisco CCNA Gold Bootcamp as your CCNA training course. The CCNA is by far the most in-demand networking certification by employers, and the Gold Bootcamp is the highest rated Cisco course online. It has an average rating of 4.8 from over 30,000 public reviews:

As a network administrator or engineer, you know how important it is to correctly set up and manage your network's IP addresses. Variable Length Subnet Masking (VLSM) is a crucial component of IP addressing, and it's essential to understand how to use it effectively.

If you're looking for an easy way to calculate subnet masks using VLSM, you've come to the right place. In this article, I'll introduce you to NetworkCalc's VLSM calculator that can help you streamline your IP address calculations.

At NetworkCalc, we understand how important it is to have accurate and reliable tools at your disposal. That's why we created a VLSM calculator and API that is both easy to use and incredibly powerful.

Quickly resize your subnet by dragging the slider to the left to decrease the number of subnet bits (which increases the size of each subnet) or right to increase the number of subnet bits (which decreases the size of each subnet).

In addition to the free online calculators, NetworkCalc has Application Programming Interfaces (APIs) for all of its tools. This means you can perform network calculations from your favorite command-line tool or develop software that integrates network calculations.

Below are some examples for how to calculate the network details from Command Prompt, PowerShell, the MacOS Terminal, or a Linux bash shell. To calculate subnets with command-line tools, use the curl application as shown below, replacing the CIDR range:

If you are taking classes for network+, they should have taught you how to do this without an online calculator (not available when I did my certs). If you have self studied, use the online version, as the theory is convoluted and math-y.

When I took my CCNA I memorized a subnetting chart. Then, as soon as the exam started I wrote down the chart. Any and all questions related to subnetting only took a quick glance at the chart. It was a breeze!