Pfsense Serial Number Jun 2026

You can edit this file by using an SSH session and a command-line text editor like vi or ee . However, Netgate strongly cautions against manually editing it unless absolutely necessary, as a mistake can render your firewall inoperable.

If the device is already installed and running, you can find the serial number without needing physical access to the machine. Log into your pfSense . Navigate to the Dashboard (the homepage). Locate the System Information widget.

Use dmidecode -s system-serial-number in the shell.

Outside of device identification, the term "serial number" appears in other areas of pfSense configuration. One notable instance is in the DNS resolver (Unbound), where zone configurations have a "Serial Number" field that must be incremented for changes to propagate to secondary DNS servers. This is a standard DNS zone file serial number and is unrelated to the hardware or system identifier discussed above. The term also appears in the context of Certificate Revocation Lists (CRLs), where certificates are internally tracked by their serial numbers.

There are several methods to find your system's identifying number, with the easiest being through the web interface. pfsense serial number

This is a very robust method for retrieving the serial number of the underlying hardware, even on generic systems.

For advanced users, system administrators, and those managing multiple devices, command-line access provides powerful ways to retrieve the serial number programmatically. Several methods are available:

| Issue | Likely Cause | Resolution | | :--- | :--- | :--- | | Serial Number shows symbols/ is blank after an update | Known bug from a firmware update | Contact for the official fix. | | Serial Number is actually a UUID | Running pfSense CE on custom hardware | This is normal behavior . No action needed. | | "Register" page is missing on pfSense Plus | Device may be pre-registered Netgate hardware | This is expected . The manual registration page is not required. | | Need to identify the system for inventory/scripting | Require a unique identifier | Use the sysctl dev.netgate.ndi command for the Netgate Device ID (NDI) . |

Finding the serial number for a Go to product viewer dialog for this item. You can edit this file by using an

Regularly update your pfSense installation to benefit from the latest features and security patches.

If you have administrative access to the web interface:

If you cannot access the web interface, the information is printed directly on the device.

The serial number will be listed under the "System" section of that widget. Log into your pfSense

: On many Netgate devices, the serial number is printed at the very top of the SSH/Console welcome banner. Netgate Forum 3. Physical Hardware : Most official Netgate appliances have a sticker on the of the device containing the serial number.

It is important to note that . Most hardware is pre-registered and does not require manual activation. For hardware that is not automatically recognized, administrators must submit a request to Netgate TAC along with both the serial number and the NDI.

For pfSense installed on generic PC hardware, the displayed serial number may vary depending on the motherboard:

Occasionally, the System Information widget or the command line may display To Be Filled By O.E.M. or leave the serial number field completely blank. Why Is It Blank?