Another way of creating an alias for a site with a number of different IP addresses is to use pfSense's bulk import function. The bulk import function can be invoked by navigating to the main Aliases page (via Firewall | Aliases) and clicking on the blue Import button.
There are three fields on the Bulk Import page: Alias Name, Description, and Aliases to import. The first two fields are identical to the same-named fields on the Aliases page that appears when the Add button is pressed. In the Aliases to import edit box, enter a carriage return-delimited list of IP addresses, with or without a CIDR and a description. When done, press the Save button.
Using Bulk Import is easy; what is hard is finding a valid list of IP addresses ...
