ip deny manager in cpanel

i tried banning few ips from accessing to my website, however it didn't work out. they are still able to access to my website.

for example his ip is 123.123.123.123
so should i ban 123.123.123.123 exactly or it has to be 123.123.123.* to ban that ip?

or is there any alternative way to ban an ip? i was told that we could edit .htaccess in public_html.

please assist me on how to do so!

 

 

 

 

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