If you have access to the console or can SSH into your pfSense system, you can find the serial number by running specific commands, such as cat /etc/pfSense/uuid or checking system information through the menu-driven interface.
When configuring or backing up your pfSense installation, referencing the serial number can help ensure you're working with the correct installation, especially in environments with multiple pfSense systems. pfsense serial number
Reset the unique identifier.
There are three primary ways to locate your serial number, depending on whether you have physical access, GUI access, or only SSH/Console access. If you have access to the console or
sysctl -n hw.serial
You can find the pfSense serial number in the following locations: pfsense serial number