This article applies to 123-reg Shared Hosting accounts.
To block an IP address from viewing websites hosted on your 123-reg hosting package, please do the following:
Login to your 123-reg control panel.
Scroll down to the web hosting section.
Select the relevant domain name from the drop down box and click on the Manage button.
Click on the IP Address Blocking option in the Web Tools section.
Enter the IP address you wish to block into the Configure IP blocking field and click on the Create button.