Can you share some more details what you would like to achieve? Generally it is possible to query a lot of information from AD via LDAP, but to provide some more assistance I would need to understand what you are looking for.
sorry for the late reply, somehow notifications to my Inbox do not seem to work.
So you generally make a DNS lookup of the Client IP to resolve a clients computer name, then want to compare this against a list you obtain from Active Directory?
Do you have a OU where all the computer objects are present? If so it could be possible to make an ExtList call via LDAP to the active directory and so make a "live" query (which is cached to some extend).
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