To protect your network from new sources of threat or
malware, you can use External Dynamic List in
URL Filtering profiles to block or allow, or to define granular
actions such as continue, alert, or override for URLs, before you
attach the profile to a Security policy rule. Unlike the allow list,
block list, or a custom URL category on the firewall, an external
dynamic list gives you the ability to update the list without a
configuration change or commit on the firewall. The firewall dynamically
imports the list at the configured interval and enforces policy
for the URLs (IP addresses or domains will be ignored) in the list.
For URL formatting guidelines, see URL Category Exception Lists.