What is Variable Length Subnet Masks (VLSM)?

A Variable Length Subnet Masks (VLSM) is like having different sized boxes to pack your toys in, you can choose how many toys each box holds depending on what you need.

Imagine you have a big toy room with 32 toys. At first, you use one big box that fits all the toys, but then you realize some of the toys are used more often than others. So instead of keeping them all in one big box, you split them into smaller boxes, maybe one for your favorite cars (which need 16 spots), another for your building blocks (which take up 8 spots), and a tiny box for just your special robot (only 1 spot). That way, you use the space better and don’t waste any room.

VLSM lets networks be divided into smaller parts, like splitting one big toy box into several smaller ones. Each of these smaller parts can have different numbers of toys, or addresses, as we call them in networking. This means a network can be more flexible and efficient, using just the right amount of space for each group instead of always using the same size boxes.

This helps keep things tidy and makes sure no one runs out of room for their toys (or internet connections).