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Use PowerShell to create an Excel report containing Active Directory Sites and Subnets

Active Directory Sites and Services is a Microsoft Management Console (MMC) snap-in that is used to administer the inter site replication topology of directory data among all sites in an Active Directory Domain Services (AD DS) forest. This PowerShell script reads the Microsoft Active Directory forest and creates a CSV file for Excel containing all the subnets and sites. This script enables you to regularly report about the current networking configuration in Active Directory.
##############################################################################
# This PowerShell script creates a CSV file for Excel containing all the
# Windows Active Directory Forest sites with their subnets
# (C)Copyright 2016 - 2019 vanSoest.it by Johan van Soest
##############################################################################

Get-ADReplicationSubnet -Filter * -Properties * |
   Sort-Object Site |
      Select-Object Site, Name, Location, Description, Created, Modified |
         Export-Csv $env:temp\SiteInfo.csv

Example

The following image is a quick overview of a site diagram of a fictive company. (Bridgehead servers removed from the drawing for clarity)
The company has one forest and domain with four sites in Aalst, San Giovanni Teatino, New York and London.
Active Directory site diagram
Active Directory site diagram

Active Directory Sites and Services

The next image shows the Active Directory Sites and Services console representing the diagram and shows the four subnets. Also shown, in Notepad, is the sites file created with the export function.
Active Directory Sites and Services with Subnet information
Active Directory Sites and Services with Subnet information in Excel

PowerShell script output

Upon running the script and importing the CSV file in Excel, the information can be presented as:
Excel 2013 Active Directory Sites and Subnet information
Excel 2013 Active Directory Sites and Subnet information
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Topic created  :  01-05-2017
Topic last edited  :  01-05-2017

Scripts and programming examples disclaimer

Unless stated otherwise, the script sources and programming examples provided are copyrighted freeware. You may modify them, as long as a reference to the original code and hyperlink to the source page is included in the modified code and documentation. However, it is not allowed to publish (copies of) scripts and programming examples on your own site, blog, vlog, or distribute them on paper or any other medium, without prior written consent.
Many of the techniques used in these scripts, including but not limited to modifying the registry or system files and settings, impose a risk of rendering the Operating System inoperable and loss of data. Make sure you have verified full backups and the associated restore software available before running any script or programming example. Use these scripts and programming examples entirely at your own risk. All liability claims against the author in relation to material or non-material losses caused by the use, misuse or non-use of the information provided, or the use of incorrect or incomplete information, are excluded. All content is subject to change and provided without obligation.
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