A destination list is a list of internet destinations that can be blocked or allowed based on the administrative preferences for the policies applied to the identities within your organization. A destination is an IP address (IPv4), URL, or fully qualified domain name. You can add a destination list to Umbrella at any time; however, a destination list does not come into use until it is added to a policy.
Note: URLs are only supported for Block lists while IP addresses are only supported for Allow lists.
Web pages utilize many different domains, and a content domain may be responsible for the remaining blocks. For more information, see Allow/Blocking a Site (Best Practice).