How to identify unknown devices on network?

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M-\joe@actionline.com
|.M+\Ed Knapp
|.M||kitepilot@kitepilot.com
|.|M|kitepilot@kitepilot.com
|.||Mkitepilot@kitepilot.com
|.|MMichael Butash
M\|joe@actionline.com
M||Stephen Partington
|M|joe@actionline.com
|M|Ed Knapp
|.MEd
MMichael Butash