We use the custom attributes in AD to trigger user syncs and filter users for various tools.\ it would be great to have them in lansweeper so we can run reports.
i would say a good start would be with extensionAttribute1 - extensionAttribute15
Additonally many folks probably use Azure Ad Sync. Fields such as mS-DS-ConsistencyGuid and msDS-cloudExtensionAttribute1 - msDS-cloudExtensionAttribute15