Find the line labeled (Netgate Device Identifier) or Serial Number . Method B: The Physical Chassis
Every pfSense configuration, including the system's unique identifiers, is stored in a single file: /conf/config.xml . This XML file contains the entire system configuration, from interface assignments to firewall rules and system settings. The serial number and Netgate Device ID are stored here as part of the system's metadata. pfsense serial number
Have a unique serial number issue? Check the official Netgate forum or open a TAC ticket—armed with your serial number, of course. Find the line labeled (Netgate Device Identifier) or