Subnet prefix length is like the size of your IP neighborhood. /24 is a small street, /16 is a whole city.
Why does it matter? Cuz if your neighborhood is too small, new devices can’t move in. Too big, and it’s a waste.
You’d change it if you’re expanding or shrinking your network. But for most home setups, /24 is perfect.
If you wanna nerd out, [this site](https://www.aelius.com/njh/subnet_sheet.html) has a cheat sheet.
Why does it matter? Cuz if your neighborhood is too small, new devices can’t move in. Too big, and it’s a waste.
You’d change it if you’re expanding or shrinking your network. But for most home setups, /24 is perfect.
If you wanna nerd out, [this site](https://www.aelius.com/njh/subnet_sheet.html) has a cheat sheet.