To restrict access to an Application Express instance to a specific range of IP addresses, enter a comma-delimited list of IP addresses. 

If necessary, you can use an asterisk (*) as a wildcard, but do not include additional numeric values after wildcard characters. For example,  138 .*. 41 . 2  is not a valid value. 

IP addresses can be entered from one to four levels. For example: 
 141 ,  141 .*
 192 . 128 . 23 . 1 

Disable Administrator Login

Select Yes to restrict user access to Application Express by disabling administrator login. Disabling adminstrator login in production environments prevents unauthorized users from logging in to Application Express Administration Services and possibly compromising user login credentials.