was something I wrote about 8 years ago, in Detecting inactive computers in your AD domain.

So it was time to update that*.

Get-ADComputer -Filter * -Properties Name, LastLogonTimeStamp | Select-Object -Property Name, CanonicalName, @{ n = "LastLogonDate"; e = { [datetime]::FromFileTime( $_.lastLogonTimestamp ) } } | Export-CSV -NoTypeInformation "C:\temp\lastlogontimestamp.csv"

will give you a handy list of computer name and the last time they were seen on the network#.

* The Quest product is no longer free.
# within the last 14 days.

Reference:
PowerShell: Get-ADComputer to retrieve computer last logon date – part 1
Converting LastLogon to DateTime format
Script: LastLogonTimestamp export csv

Related posts:

Getting a list of users in your AD domain via Powershell Detecting inactive computers in your AD domain. Assorted Active Directory things

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