- To learn how to Subnet: watch the free training videos listed beneath the problem generator
- To practice Subnetting: Click on the
button below`[New Problem]`

- Solve the five attributes for the given Target IP and CIDR
- Click
to check if your answer was correct`[Check]`

- Click
to view correct answers`[Show]`

- Type "." or "/" in any input box to jump to the next box
*(desktop only)* - Keyboard
button will perform following action:`[ENTER]`

v1.6

This video series will teach you everything you need to know about Subnetting.

To maximize your retention, it is recommended to watch these videos in order, and take a quick practice break after video 4, video 5, and video 7.

In **Video 1**, you will learn the basics of subnetting. Every Subnetting problem will ask you to solve for one or more of seven possible attributes. This video explains what each of the attributes are.

In **Video 2** of the series, we will show you how to draw the ultimate Subnetting Cheat Sheet. The rest of the videos in this series will show you how to use this Cheat Sheet to answer any subnetting problem in 60 seconds or less.

In **Video 3**, we will show you how to use the Subnetting Cheat Sheet to solve for all seven attributes of Subnetting (explored in video 1) in 60 seconds or less.

In **Video 4** there are four more practice problems to provide further demonstrations of the method and cheat sheet. The first two problems are fairly straight forward. The second two demonstrate a couple specific peculiarities you might encounter in the real world.

In **Video 5**, we will show you four tricks that will help you solve subnetting problems even faster. With the speed tips in this video, and a little practice, it won't be unreasonable to be able to solve subnetting questions in as little as 10 seconds.

In **Video 6**, we show you how to extend the Subnetting Cheat Sheet to allow you to solve problems in the /17-/24 range just as easily as the /25-/32 range.

In **Video 7**, we show you how to extend the Subnetting Cheat Sheet to allow you to solve problems in the /1-/16 range.

In **Part 1** of the **FLSM and VLSM Appendix**, we explain the Network Doubling logic, and use it to show you how to solve two types of FLSM questions. Then we illustrate 2^N notation, and demonstrate how to use it to answer FLSM questions quickly.

*--- presented by ---*

Visit PracNet.net for more free resources to learn

Network Engineering and Network Security.

In particular, check out the **Packet Traveling** article series

This series will teach you everything you need to know to understand how packets move through a network.