Setting IP Address and Domain Name Restrictions (IIS 6.0)
One method of protecting the Web sites and applications that are hosted on your server is to restrict access from specific IP addresses or domain names. You can explicitly grant or deny access to any combination of IP address ranges or domain names.
By restricting access to Web sites and applications by using IP address ranges or domain names, you can grant or deny access to a specific set of computers or to an organization. The restrictions that you specify affect the entire Web site or application and cannot be configured for individual portions of the Web site or application.
Restrict access to a specific Web site for a specific IP address range or domain name by completing the following steps:
For more information about setting IP address and domain name restrictions, see Configure IP Address and Domain Name Restrictions.