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:
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.
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
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 blogger, Speaker, and Local User Group HTMD Community leader. His main focus is on Device Management technologies like SCCM 2012, Current Branch, and Intune. E writes about ConfigMgr, Windows 11, Windows 10, Azure AD, Microsoft Intune, Windows 365, AVD, etc…