Use the Edit IP and Domain Restrictions dialog box to define access restrictions for unspecified clients or to enable domain name restrictions for all rules.
UI Element List
Access for unspecified clients
Defines access restrictions for unspecified clients. This setting defines whether to allow or deny access to clients not specified by any other rule.
Enable domain name restrictions
Enables rules that restrict access by domain name. This rule significantly affects server performance because it requires a DNS lookup for every request.