If it is not visible, ensure the "System" section of the widget is not hidden. For non-Netgate hardware, pfSense may display the or the serial number populated in the system's BIOS. Physical Label : A sticker with the serial number and Netgate Device ID (NDI)
If you cannot access the web interface, you can retrieve hardware information through a console or SSH connection. pfsense serial number
A: Not natively. CE does not require one. If you see a number there, it is a dummy value or a leftover from previous hardware. If it is not visible, ensure the "System"
You can register a CE installation for a free pfSense Plus Home+Lab license . This process will generate a virtual serial number for your instance, allowing you to upgrade to Plus. A: Not natively
Go to portal.netgate.com and create a free account.