How to block an IP address?
Finally, I found a solution by using PF.

(1) edit PF configuration

sudo vim /etc/pf.conf


Append the following line to the file:

block drop from any to &lt;IP Address&gt;


For example: block drop from any to 8.8.8.8

(2) Load the config by running

sudo pfctl -f /etc/pf.conf


(3) Enable PF by running:

sudo pfctl -e


(*) If you want to disable PF, run:

sudo pfctl -d