When managing a pfSense firewall, the "serial number" can refer to two different things: the (relevant for appliances like Netgate SG-1100, SG-3100, etc.) or the software license serial number (relevant for pfSense Plus).
For official Netgate hardware, the serial number can also be found on a physical sticker located on the bottom of the device. This is particularly useful when you need to identify the device before it is powered on or when network access is unavailable. The sticker typically includes both the serial number and, on newer devices, the Netgate Device ID.
The registration page is located at in the pfSense web GUI. The process requires an activation token supplied by Netgate, generated when purchasing pfSense Plus software or through Netgate TAC support.
Another command-line trick reveals the internal Unique ID, which behaves like a serial for software instances:
cat /etc/uniqueid
Netgate has acknowledged this as a known issue, noting that "it's purely a cosmetic issue so no need to panic". The recommended course of action is to contact support@netgate.com for assistance. A fix from Netgate Customer Support typically resolves the problem.
For pfSense installed on generic PC hardware, the displayed serial number may vary depending on the motherboard:
If your firewall dies, you can:
Do you currently have , or is the device offline ? Share public link pfsense serial number
It is common to confuse the with the Hardware Serial Number . Understanding the difference prevents delays when contacting support. Netgate Device ID Hardware Serial Number What it is A cryptographic hash generated by the pfSense software. A physical identifier assigned at the factory. Uniqueness Based on your system's unique hardware components. Tied directly to the physical chassis/motherboard. Custom Hardware Present on custom white-box PCs running pfSense.
Netgate serial numbers typically consist of a string of alphanumeric characters often preceded by "S/N" or "Serial." Why Do You Need Your pfSense Serial Number?
The location of the serial number varies drastically depending on your setup. Below are the four definitive ways to find it.
dmidecode -t system (Provides a full overview of system manufacturing details) When managing a pfSense firewall, the "serial number"
Netgate hardware stores the serial number in the system environment variables. Run the following command in the shell: kenv smbios.system.serial Use code with caution.
This generates a 20-character, hardware-hashed string. While not an official "serial number" for support, it uniquely identifies that specific pfSense installation. If you clone a VM, this ID will change or remain? (It remains on clones, causing issues—more on that later).
For official Netgate appliances (such as the SG series, 1100, 2100, 3100, 4200, 5100, 7100, 8860, and others), the serial number corresponds to the physical device's unique hardware identifier. These are genuine manufacturer-assigned serial numbers that Netgate uses to track warranty status, support entitlements, and software licensing.
The spare’s identity.