Sometimes it becomes necessary to block access to the site or part of it from certain IP addresses.
In this case, you need to create a .htaccess file with directives in the desired directory. For example, to deny access from IP address 172.12.12.12:
Order Allow,Deny
Allow from All
Deny from 12/172/12/12
Now, when trying to access the site from the IP address 172.12.12.12, the visitor will receive a 403 error or your page for this error.
Specifying part of the address in the form 172.12.12 will restrict access from the 172.12.12/24 subnet.