Blocking Access to URL Entire Networks with pfSense

To block (or enable) an entire network for a URL, you need to create a properly formatted URL table file for pfsense. Three steps to create the file:
1) Lookup an ip from the URL
2) run a whois against one of the IPs so you can get the AS number
3) run a whois against the AS number and dump out the whole routing table, output it to a file.

host ups.com
whois -h whois.radb.net 153.2.228.50
whois -h whois.radb.net -- '-i origin AS12217' | grep ^route | grep -v route6 | cut -d" " -f7 > ups.com

Once that is done, put the file on a web server in a place that pfsense can reach it. Configure the alias to point to the URL of the file, and select how many days it should check in and get a new file.

The last whois command could be crontab'd to periodically run and update the url table file.