By switching on this option you will able to restrict access to Which50 to a limited list of IP addresses.
Please ensure you are certain you wish to implement this option before activating it.
Once activated, you can enter your designated IP addresses by clicking the Green Add New IP Address button.
If you wish to restrict access to a range of IP addresses, you can use the IP Mask field. Please ensure you have adequate knowledge of your network infrastructure before implementing this option.