SCCM IP Check Script to Remove All of the Stale Systems from AD

ConfigMgr Client IP Check ScriptTroubleshooting client agent health issues at my current customer, I wanted to eliminate all of the stale systems from AD, so I didn’t waste my time on them (and of course, the customer was no real help here). I decided to write a script to take a list of systems, check if a forward and a reverse DNS entry exists, and compare the DNS reverse entry (if it exists) to the system’s name as specified in the list. Using these checks, I can now identify systems that probably don’t exist anymore and can be deleted from or disabled in Active Directory, thus allowing ConfigMgr to be cleaned up. Sample output:

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SCCM IP Check Script to Remove All of the Stale Systems from AD 1

Actual/exact interpretations of each category are possibly subjective and based on the configuration of a particular environment. Still, in general, IP registered to another system and Could not Resolve IP indicate stale systems. Recall that AD System Discovery also does a forward DNS lookup on systems before it creates a DDR on them. This script follows similar logic as the discovery; however, once the system is discovered, AD Discovery won’t remove it, and thus this script. Also, AD discovery doesn’t do a reverse lookup because this may or may not be configured in any given environment.

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The script is a PowerShell script and can be run on any system that can query the internal DNS. By default, and it pulls the names of systems to check from a file called sys.txt in the same directory as the script; place each system name to query on a separate line.

And then, run it from a PowerShell command prompt. To output the results to a CSV, pipe the output of the script to the Export-CSV commandlet; e.g., .\IPCheck.ps1
Export-Csv c:\IpCheckResults.csv

Log in to the original Post to download the script –> http://myitforum.com/cs2/blogs/jsandys/archive/2011/01/06/configmgr-client-ip-check-script.aspx

Anoop is Microsoft MVP! He is a Solution Architect in enterprise client management with more than 20 years of experience (calculation done in 2021) in IT. He is a logger, Speaker, and Local User Group HTMD Community leader. His main focus is on Device Management technologies like SCCM 2012, Current Branch, and Intune. He writes about ConfigMgr, Windows 11, Windows 10, Azure AD, Microsoft Intune, Windows 365, AVD, etc…

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