show mode If it returns Security context mode: multiple , switch to system: changeto system show inventory
. This is the most common way to retrieve the hardware serial number remotely. Router Switch Blog Alternative Methods Inventory Command cisco asa serial number command
In the example above, JMX2048X123 is the serial number you would provide to Cisco TAC. show mode If it returns Security context mode:
| ASA Type / Scenario | Best Command | Why | | :--- | :--- | :--- | | | show version | Quick, universally supported | | 5500-X Series (5512-X to 5555-X) | show inventory | Also shows power supply and fan tray serials | | Firepower 1000/2100 running ASA | show module | ASA is a module on FXOS chassis | | ASA 5506-X / 5508-X / 5516-X | show inventory | Distinguishes between ASA and FirePOWER serials | | ASAv (Virtual) | show version | Shows UUID-based serial for licensing | | Multi-Context Mode | changeto system + show inventory | Physical serial only visible in system context | | Dead ASA (No CLI) | Physical sticker or QR code | Only reliable method without power | | ASA Type / Scenario | Best Command
To find the serial number of a (Adaptive Security Appliance), use the following CLI command: show version Use code with caution. Copied to clipboard