Wildcard Mask Practice

Drill wildcard masks used in ACLs: invert any prefix into its wildcard form.

What is the wildcard mask for /16?

Score 0 / 0

How to read the result

Wildcard = 255.255.255.255 minus the subnet mask. /24 mask 255.255.255.0 inverts to 0.0.0.255.

Example

/24 → wildcard 0.0.0.255

FAQ

What do questions cover?

Wildcard masks for prefixes /8 to /30, including tricky non-octet boundaries.

Do I need an account?

No. Questions generate instantly in your browser, unlimited and free.