Number — Pfsense Serial

Outside of device identification, the term "serial number" appears in other areas of pfSense configuration. One notable instance is in the DNS resolver (Unbound), where zone configurations have a "Serial Number" field that must be incremented for changes to propagate to secondary DNS servers. This is a standard DNS zone file serial number and is unrelated to the hardware or system identifier discussed above. The term also appears in the context of Certificate Revocation Lists (CRLs), where certificates are internally tracked by their serial numbers.

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A cryptographic hash generated by the pfSense software based on your system’s unique hardware characteristics (CPU, motherboard, etc.).

Output:

Example: SG3100W123456789 might decode as: SG-3100, Week 12 of 2023, unit #456789.

Connect to your pfSense device via or a standard Console cable . Enter the menu option for the Shell (typically option 8 ). pfsense serial number

This immediate identification is useful for quick checks and inventory scripts.

The serial number (and the Netgate Device ID) is the key that unlocks official support and certain software features. Outside of device identification, the term "serial number"