blocking a range of external ip addresses

[RobLatour]

I am currently using an alias to block specific external ip v4 addresses; which is great.

However, I would like to be able to all external IP v4 addresses from a specific range of IP addresses.

For example x.y.*.*  (where x and y are specific numbers that I enter, and the * can be anything from 0 to 255)

What is the best approach for this?

[SFC]

You would create an alias with a type of network, and then put in the appropriate subnet and subnetmask.

If you wanted X.X.*.* - it would be 192.168.0.0/16
X.X.X.* would be 192.168.1.0/24

https://www.freecodecamp.org/news/subnet-cheat-sheet-24-subnet-mask-30-26-27-29-and-other-ip-address-cidr-network-references/

[RobLatour]

Perfect, that works really well.  Thank you.