You can configure a User Setting Level or user to allow connection to a specific IP address. (Wildcards and ranges are not accepted.)
To restrict users to a single IP address
In the Administrator, connect to the server, then click the Server tab.
In the left pane, click the User Setting Level or user that you want to configure.
In the right pane, click the Security tab.
Select the Restrict to this IP check box and enter the IP address.