# Question about correct IP block expression

Dear all,

I would like to block all IPs from 78.55.0.0 - 78.55.255.255 in CSF. Am I right assuming that the following expression for the whole block is right?

78.55.0.0/16

Thank you in advance an kind regards -Amitz

Got divided by zero. Three times. What a ride.

## Comments

Yes, the CIDR notation is correct. You may want to check out the CIDR calculators available online next time. ;-)

Selling multiple 2000-user GApps :) Shoot me a message to make an offer.

Thanks a lot! :)

Got divided by zero. Three times. What a ride.

Solved with one word.

The way of the Samurai. ;)

Got divided by zero. Three times. What a ride.

Edited :3

Selling multiple 2000-user GApps :) Shoot me a message to make an offer.

Thank you for the link!

Got divided by zero. Three times. What a ride.