Protocols (Regular Profile) : Managing Basic IP Firewall : Firewall Rule Parameters : Hosts
  
Hosts
The Hosts parameter specifies remote hosts (computers, servers, websites, etc.) to which the rule applies.
Hosts can be specified in any of the following formats:
DNS name or resource URI (for example, www.host.com or www.host.com/path/resource). An asterisk (*) can be used to match an arbitrary series of characters in a name or URI (for example, *.host.com matches any name that ends with .host.com).
 
Important: When the Override Protocols Permissions check box is selected, an asterisk with a dot (*.) in the DNS name or resource URI matches not only an arbitrary series of characters that ends with a dot, but also the absence of characters, including a dot. Thus, with the host name *.host.com, such a rule would block access to www.host.com as well as to host.com. To block access to host.com only, exactly this name, host.com, must be specified. Access to www.host.com is not blocked in this case.
IPv4 address (for example, 12.13.14.15). You can specify a range of IPv4 addresses separated by a dash (-) (for example, 12.13.14.18-12.13.14.28).
IPv6 address, such as fe80:0000:0000:0000:0a2f:7e00:0004:533a, fe80:0:0:0:a2f:7e00:4:533a, or fe80::a2f:7e00:4:533a.
Multiple hosts must be separated by a comma (,) or semicolon (;). You can also press ENTER after each entry. You can specify multiple hosts in different formats described above (for example, www.microsoft.com; 12.13.14.15, 12.13.14.18-12.13.14.28).
 
Note: If you specify hosts and do not specify ports, the rule will either allow or block all client connections to the specified hosts.