Pfsense | Serial Number
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 administrative access to the web interface:
If you are using an official Netgate appliance (SG-2100, SG-5100, etc.):
This is the most misunderstood aspect of the topic. pfsense serial number
| Feature | pfSense CE (Community) | pfSense Plus (on Netgate HW) | pfSense Plus (VM/Whitebox) | | :--- | :--- | :--- | :--- | | Requires Serial? | No | Yes (Hardcoded) | Yes (Software Key) | | Where to find it? | N/A or Motherboard S/N | System > General Setup | System > General Setup | | TAC Support eligibility | No | Yes | Yes (with subscription) | | AutoConfigBackup | Yes (but limited) | Yes (full) | Yes (with license) | | CE to Plus upgrade | N/A | Auto via serial | Requires purchase |
Critical Takeaway: If you search for "pfsense serial number" hoping to unlock pfSense Plus for free on an old Dell PC, you will be disappointed. The serial number is not a crack; it is a hardware-bound identifier or a paid license key.
If you purchased an official Netgate appliance (e.g., SG-1100, SG-2100, 6100, 8200, 1541), the serial number is your key to world-class Technical Assistance Center (TAC) support. When opening a support ticket, the first thing Netgate support will ask for is the serial number. This ties your device to your purchase date, warranty status, and support level. There are three primary ways to locate your
Let’s jump into the story of Alex, a junior network admin at a regional library system.
One Tuesday morning, their primary SG-3100 firewall began rebooting every 20 minutes. The library’s patron internet died. Alex panicked. The device was out of warranty, but he had purchased a pfSense TAC Support subscription tied to the device’s serial number.
He opened a ticket with Netgate Support, attaching the output of cat /etc/version. Within minutes, support identified the serial as part of a batch with known eMMC wear issues. Because the serial number was on file, they sent a replacement RMA unit overnight—no questions asked. If you are using an official Netgate appliance
But here’s the magic: The new unit’s serial number was different. Alex plugged it in, booted to pfSense, and selected “Restore from AutoConfig Backup”. The system asked: Enter your previous serial number.
He typed SG3100W123456789. The pfSense cloud service (Netgate’s AutoConfig Backup) downloaded the exact configuration—firewall rules, VLANs, OpenVPN certs—and applied it to the new serial number. In 10 minutes, the library was back online.
To avoid clone conflicts, manually assign a unique UUID in your VM config:
This allows you to track hundreds of virtual pfSense instances via asset management tools.
Virtualization completely changes the game. A VM has no physical serial number unless you assign one.