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Updated Acceptable Use Policy.
As an additional security level, you can limit the scope of some IP addresses for your user to be able to sign in from. You can set up and see his personal Allowed IP addresses on the User profile page of some user under General section as follows
Pay attention!
if this field is not empty then ONLY stated IPs are allowed to sign in from for this user. Otherwise, if this field is empty then account level allowed IPs are applied, to know more about it please read the chapter