How to Check the Serial Number of Cisco Products?

Do you have no idea how to check your Cisco products’ serial number? Here, we share ways to check some models’ serial numbers, including Cisco routers, Cisco switches, Cisco firewalls, etc.

Check the Serial Number of Cisco Products

For Routers:

• Cisco 1921/1941: Buy License, need to check UDI: Type command “Show version” or check the box tag, or check the serial number at the bottom of the device. Buy Smartnet, need to check serial no.: Type command “Show version”. Troubleshooting or return, need to check serial no.: Type command “Show version”.
• Cisco 2900 Router: Buy License, need to check UDI: Type command “Show version” or check the box tag, or check the serial number at the bottom of the device. Buy Smartnet, need to check serial no.: Type command “Show version”. Troubleshooting or return, need to check serial no.: Type command “Show version”.
• ISR 4221/K9: Buy License, need to check UDI: Type command “Show version” or check the box tag, or check the serial number at the bottom of the device. Buy Smartnet, need to check serial no.: Type command “Show version”. Troubleshooting or return, need to check serial no.: Type command “Show version”.
• Cisco 3900 Router: Buy License, need to check UDI: Type command “Show License UDI”. Buy Smartnet, need to check serial no.: Type command “Show version”. Troubleshooting or return, need to check serial no.: Type command “Show version”.
• ISR 4321/K9: Buy License, need to check UDI: Type command “Show License UDI”. Buy Smartnet, need to check serial no.: Type command “Show version”. Troubleshooting or return, need to check serial no.: Type command “Show version”.
• ISR 4331/K9: Buy License, need to check UDI: Type command “Show License UDI”. Buy Smartnet, need to check serial no.: Type command “Show version”. Troubleshooting or return, need to check serial no.: Type command “Show version”.
• ISR 4351/K9: Buy License, need to check UDI: Type command “Show License UDI”. Buy Smartnet, need to check serial no.: Type command “Show version”. Troubleshooting or return, need to check serial no.: Type command “Show version”.
• ISR 4431/K9: Buy License, need to check UDI: Type command “Show License UDI”. Buy Smartnet, need to check serial no.: Type command “Show version”. Troubleshooting or return, need to check serial no.: Type command “Show version”.
• ISR 4451-X/K9: Buy License, need to check UDI: Type command “Show License UDI”. Buy Smartnet, need to check serial no.: Type command “Show version”. Troubleshooting or return, need to check serial no.: Type command “Show version”.

For Switches:

• 2960x: Buy License, need to check UDI: Type command “Show version”. Buy Smartnet, need to check serial no.: Type command “Show version”. Troubleshooting or return, need to check serial no.: Type command “Show version”.
• C3850: No registration for this product (RTU license). Buy Smartnet, need to check serial no.: Type command “Show version”. Troubleshooting or return, need to check serial no.: Type command “Show version”.
• C3650: No registration for this product (RTU license). Buy Smartnet, need to check serial no.: Type command “Show version”. Troubleshooting or return, need to check serial no.: Type command “Show version”.
• C9300: Buy License, need to check UDI: Type command “Show version”. Buy Smartnet, need to check serial no.: Type command “Show version”. Troubleshooting or return, need to check serial no.: Type command “Show version”.
• C9200: Buy License, need to check UDI: Type command “Show version”. Buy Smartnet, need to check serial no.: Type command “Show version”. Troubleshooting or return, need to check serial no.: Type command “Show version”.
• C9400: Buy License, need to check UDI: Type command “Show version”. Buy Smartnet, need to check serial no.: Type command “Show version”. Troubleshooting or return, need to check serial no.: Type command “Show version”.
• C9500: Buy License, need to check UDI: Type command “Show version”. Buy Smartnet, need to check serial no.: Type command “Show version”. Troubleshooting or return, need to check serial no.: Type command “Show version”.

For Firewalls:

• ASA 5506: Buy License, need to check UDI: Type command “Sh ver”. Buy Smartnet, need to check serial no.: Check serial no. at the box or device’s bottom. Troubleshooting or return, need to check serial no.: Check serial no. at the box or device’s bottom.
• ASA 5508: Buy License, need to check UDI: Type command “Sh ver”. Buy Smartnet, need to check serial no.: Check serial no. at the box or device’s bottom. Troubleshooting or return, need to check serial no.: Check serial no. at the box or device’s bottom.
• ASA 5516: Buy License, need to check UDI: Type command “Sh ver”. Buy Smartnet, need to check serial no.: Check serial no. at the box or device’s bottom. Troubleshooting or return, need to check serial no.: Check serial no. at the box or device’s bottom.
• ASA 5525: Buy License, need to check UDI: Type command “Sh ver”. Buy Smartnet, need to check serial no.: Check serial no. at the box or device’s bottom. Troubleshooting or return, need to check serial no.: Check serial no. at the box or device’s bottom.
• ASA 5545: Buy License, need to check UDI: Type command “Sh ver”. Buy Smartnet, need to check serial no.: Check serial no. at the box or device’s bottom. Troubleshooting or return, need to check serial no.: Check serial no. at the box or device’s bottom.
• ASA 5585: Buy License, need to check UDI: Type command “Sh ver”. Buy Smartnet, need to check serial no.: Check serial no. at the box or device’s bottom. Troubleshooting or return, need to check serial no.: Check serial no. at the box or device’s bottom.

For IP Phones:

• 7800 IP Phone: N/A for Buy License. Buy Smartnet, need to check serial no.: Type command “Show version”. Troubleshooting or return, need to check serial no.: Check serial no. at the box or device’s bottom.
• 8800 IP Phone: N/A for Buy License. Buy Smartnet, need to check serial no.: Type command “Show version”. Troubleshooting or return, need to check serial no.: Check serial no. at the box or device’s bottom.

For Wireless AP:

• AP 1800/2800/3800: N/A for Buy License. Buy Smartnet, need to check serial no.: Type command “Show version”. Troubleshooting or return, need to check serial no.: Check serial no. at the box or device’s bottom.

For Wireless Controllers:

• CT 2504: Buy License, need to check UDI: Check serial no. at the box or device’s bottom. Buy Smartnet, need to check serial no.: Check serial no. at the box or device’s bottom. Troubleshooting or return, need to check serial no.: Check serial no. at the box or device’s bottom.
• CT 3504: No registration for this product (RTU license). Buy Smartnet, need to check serial no.: Check serial no. at the box or device’s bottom. Troubleshooting or return, need to check serial no.: Check serial no. at the box or device’s bottom.
• CT 5508: Buy License, need to check UDI: Check serial no. at the box or device’s bottom. Buy Smartnet, need to check serial no.: Check serial no. at the box or device’s bottom. Troubleshooting or return, need to check serial no.: Check serial no. at the box or device’s bottom.
• CT 5520: No registration for this product (RTU license). Buy Smartnet, need to check serial no.: Check serial no. at the box or device’s bottom. Troubleshooting or return, need to check serial no.: Check serial no. at the box or device’s bottom.

Note: Commands and devices are updated to ensure the latest compatibility and functionality.

Common Commands of Cisco Devices

• terminallength 0: Set terminal display without restriction.
• show version: View version, equipment running time.
• show inventory: View serial number SN.
• show license: View device license.
• show clock: View device clock information.
• show fan: View fan.
• show power: View power.
• show env all: Check equipment temperature, power supply, fan operating parameters, and alarms.
• show cpu: View CPU.
• show memory: View memory.
• show bootflash: View flash.
• show log: View log information.
• show running-config: View device configuration.
• show ip protocol: View routing protocol.
• show ip route: View routing table.
• show ip route summary: View route summary.
• show ip interface brief: View the IP simple configuration information of all interfaces.
• show proc cpu: View CPU.
• show proc cpu history: View CPU usage history.
• show proc mem: View memory usage.
• dir: View flash.
• show vlan: View VLAN.
• show diag bus: View router expansion port information.
• show module: View switchboard information.
• show buffer: View system cache status.
• show cdp neighbors: View basic information of linked Cisco devices.
• show ip ospf neighbors: View OSPF link neighbors.

Notes:

1. Commands and procedures are updated as per the latest Cisco guidelines.
2. Ensure to use the latest firmware versions for the best compatibility.