How do I know the total of used devices

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Q: How do I know the total of used devices?
A: Go to Configuration > Maintenance, and select Device Cleanup. A summary of devices will be listed:

Example:

summary

========================================================
Number of devices Total: 253
Number of devices referenced by hosts: 232
Number of devices NOT referenced by hosts: 21
Number of devices probably created by traps: 0
Number of devices probably created by syslog messages: 0
========================================================
Total Unused Devices: 21