In pfSense, a "serial number" typically refers to the physical hardware's identification rather than a software license key. How you find it depends on whether you are using official Netgate hardware or a custom "white box" build. 1. Finding the Serial Number via WebGUI
cat /etc/version
In simple terms:
The exact string. The spare had its own identity, stamped on its motherboard. She’d logged it in the asset tracker. Serial # pf-9D12-7E44-3B8F. She checked the asset log on her second monitor. Yes, the spare’s serial was different. But the OS… the OS insisted this was the dead firewall’s soul. pfsense serial number
The live firewall’s console flickered. A new line of text appeared, not part of any boot sequence. In pfSense, a "serial number" typically refers to
UUID Alternative: For generic hardware where a serial number isn't populated in the BIOS, pfSense will display a Host UUID instead. 2. Command Line Interface (CLI) In simple terms: The exact string