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The script output should look similar to this: Bottom Line: The association of subnets to Active Directory sites has a significant impact on the client machines performance.
Missing this association may lead to poor performance and unexpected login times.
For doing that, each site is associated with the relevant subnets, which correspond to the range of IP addresses in the site.
You can use Active Directory Sites and Services to manage and associate your subnets.
Beside Windows Server roles, I also find special applications and features running on the Domain Controllers, like KMS (Key Management Service) host for volume activation, or Azure AD Connect for integrating on-premises directories with Azure AD.
You can use the following Power Shell script to create a report of all clients which are not mapped to any AD sites, based on the files from all of the Domain Controllers within the domain.
If you suspect that you have missing subnets in your Active Directory environment, you can look for event ID 5807 (Source: NETLOGON) within your Domain Controllers.
The event is created when there are connections from clients whose IP addresses don’t map to any of the existing AD sites.
When the client’s IP address cannot be found, the client may connect to any Domain Controller, including ones that are physically far away from him.
This can result in communication over slow WAN links, which will have a direct impact on the client login process.