How to Configure and Test FQDN Objects

How to Configure and Test FQDN Objects

Created On 09/25/18 17:39 PM - Last Modified 01/12/22 21:24 PM


  • PAN-OS 7.1 and higher.
  • Palo Alto Firewall.
  • Address Object Configuration.



  • The FQDN object is an address object, which means it's as good as referencing a Source Address or Destination Address in a security policy.
  • Therefore, every 30 minutes, the Palo Alto Networks Firewall will do an FQDN Refresh, in which it does an NS lookup to the DNS server that's configured (Setup > Services). The firewall maps up to 32 IP addresses to that FQDN object.
  • Make sure that this is the same server that your hosts are using. DNS malware can adversely affect a solution like this.
  • Use this method only when using an IP address is not possible--don't use this type of object as part of a URL filtering policy.
  • This can also be helpful to control other services that don’t relate to web browsing like ftp, ssh, or any other service.
  • If the object also resolves to an IPv6 address, enable IPv6 Firewalling (Device > Setup > Session).

Configuring the object

To begin configuration of FQDN objects, go to Objects > Addresses

  1. Click Add to create a new address object
  2. Change the type from ‘IP/Netmask’ to ‘FQDN’
  3. Enter the address (do not include http:// or any other header)
  4. Click OK
  5. Commit the changes



On the CLI, FQDN objects can be set using the following command in configure mode:

# set address Google fqdn


Confirming the changes

  • An automatic Refresh FQDN task will run in the background. The status of this job can be checked by clicking the Tasks button at the bottom right corner of the GUI.
  • The CLI command below can then be used to view the list of FQDN objects and the IP addresses associated with that name.
    • PAN-OS 8.1 and below: > request system fqdn show
    • PAN-OS 9.1 and above: > show dns-proxy fqdn all
  • It is possible to force a refresh by running the command above.
  • As a recommended extra check, ping the host from a desktop to make sure it matches the IP address listed after running the command.

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